Universal SEO, PDF & AI Utilities.
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Instant search engine optimization tools, Linux-powered PDF converters, LLaMA AI content writers, and high-speed media utilities.
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40 Advanced Text Analysis & AI Content Tools
Instant plagiarism checking, advanced AI article rewriting, word counting, case conversion, and text sanitization built for content creators and SEO copywriters.
Online Paraphrasing Tool & Synonym Studio
Rewrite sentences and articles across 6 editorial tones with interactive WordNet 3.1 click-to-swap synonyms, frozen
AI Content Detector & Burstiness Analyzer
Detect AI-generated vs human-written copy with sentence-level burstiness telemetry, perplexity scoring, and neural
Article Rewriter
Use Seoffix Article Rewriter (article rewriter) to process inputs instantly in your browser—100% free, private, and
Plagiarism Checker
Free Plagiarism Checker by Seoffix Design Lab: instant plagiarism checker and detector results in your browser with
Word Counter
Free Word Counter by Seoffix Design Lab: instant word counter pro and count results in your browser with full priva
Online Md5 Generator
Compute deterministic 128-bit MD5 hexadecimal digests from text strings for checksum verification and legacy cache
Paraphraser Tool Lite
Free Paraphraser Tool Lite by Seoffix Design Lab: instant tool and paraphrase diagnostics in your browser with full
Content Rewriter Pro
Restructure multi-paragraph drafts for stronger sentence variety, cleaner transitions, and polished publication ton
Change Text Case
Free Change Text Case by Seoffix Design Lab: instant text and text case diagnostics in your browser with full priva
Grammar Checker
Free Grammar Checker by Seoffix Design Lab: instant grammar and grammar checker results in your browser with full p
Remove Duplicate Lines
Free Remove Duplicate Lines by Seoffix Design Lab: instant duplicate and remove duplicate diagnostics in your brows
Line Counter
Free Line Counter by Seoffix Design Lab: instant line counter and line diagnostics in your browser with full privac
Lorem Ipsum Generator
Free Lorem Ipsum Generator by Seoffix Design Lab: instant lorem ipsum and generator diagnostics in your browser wit
Duplicate Content Detector
Compare pages or pasted text passages to detect near-duplicate boilerplate and overlapping copy that could dilute r
Reverse Text Generator
Free Reverse Text Generator by Seoffix Design Lab: instant reverse and text generator diagnostics in your browser w
Small Text Generator
Free Small Text Generator by Seoffix Design Lab: instant small text and small text generator diagnostics in your br
Text Compare
Free Text Compare by Seoffix Design Lab: instant text and compare diagnostics in your browser with full privacy and
Upside Down Text Generator
Free Upside Down Text Generator by Seoffix Design Lab: instant text and flip diagnostics in your browser with full
Word Counter Pro
Free Word Counter Pro by Seoffix Design Lab: instant word counter pro and count diagnostics in your browser with fu
Article Scraper
Free Article Scraper by Seoffix Design Lab: instant scrape and scraper diagnostics in your browser with full privac
Comma Separating Tool
Free Comma Separating Tool by Seoffix Design Lab: instant comma and add comma diagnostics in your browser with full
Code Difference Comparison Tool
Free Code Difference Comparison Tool by Seoffix Design Lab: instant compare and tool diagnostics in your browser wi
Add Line Numbers to Text
Free Add Line Numbers to Text by Seoffix Design Lab: instant number and line diagnostics in your browser with full
Fancy Font & Text Style Generator
Style plain text into copy-and-paste Unicode serif, script, fraktur, monospace, and bold alphabets for social profi
Zalgo & Glitch Text Generator
Add customizable combining diacritic Zalgo distortion above, through, and below text characters with an intensity s
Bubble & Circled Text Generator
Wrap letters and digits inside circled and negative-circled Unicode bubble characters for standout headings and bio
NATO Phonetic Alphabet Speller
Spell callsigns, serial numbers, and names unambiguously using the official ICAO/NATO Alpha-Bravo-Charlie phonetic
Braille Code & Unicode Translator
Convert English letters and numbers into Grade-1 Unicode Braille dot patterns (⠁⠃⠉) and decode Braille back into pl
Readability Score & Grade Calculator
Compute Flesch Reading Ease, Kincaid Grade, Automated Readability Index (ARI), and Coleman-Liau scores on any artic
English to Gen-Z Slang Converter
Playfully translate formal corporate sentences into lighthearted internet colloquialisms for social media skits and
Whitespace & Line Break Cleaner
Collapse double spaces, strip trailing tabs, normalize CRLF/LF line endings, and clean messy copy-pasted text block
Invisible Text & Zero-Width Steganography Studio
Inspect, strip, or test Unicode zero-width space characters in strings to debug copy-paste bugs and hidden watermar
Online Line Break Remover & Paragraph Cleaner
Strip unwanted hard line breaks from PDF-copied paragraphs while optionally preserving intentional double-newline b
ASCII Art Text Banner Generator
Render titles and terminal banners into classic monospaced ASCII block-letter fonts ready for READMEs and CLI heade
Leetspeak (1337 5P34K) Text Generator
Encode plain words into classic 1337 (leetspeak) alphanumeric substitutions and decode leetspeak strings back to En
Agency White-Label Audit
Package technical SEO, performance, and security findings into a branded client-ready executive audit checklist.
Proposal Deliverables Builder
Scope SEO, content, and web-engineering deliverables with clear milestones, timelines, and pricing tables for clien
Lead Magnet Scorecard
Grade landing-page lead magnets across value clarity, form friction, trust proof, and follow-up conversion readines
Article Density Checker
Free Article Density Checker by Seoffix Design Lab: instant keyword and keyword density checker diagnostics in your
Random Word Generator
Free Random Word Generator by Seoffix Design Lab: instant generator and generate diagnostics in your browser with f
65 High-Performance Online PDF Tools
Client-side WebAssembly and native Linux PDF engines built directly into Seoffix Design Lab. Convert, merge, split, compress, protect, unlock, sign, edit, and crop documents with complete browser privacy and zero file size fees.
Merge PDF
Use Seoffix Merge PDF (merge pdf) to process inputs instantly in your browser—100% free, private, and no signup req
Split PDF
Use Seoffix Split PDF (split pdf) to process inputs instantly in your browser—100% free, private, and no signup req
Rotate PDF
Use Seoffix Rotate PDF (rotate pdf) to process inputs instantly in your browser—100% free, private, and no signup r
Delete PDF Pages
Remove unwanted blank, cover, or appendix pages from any PDF document and download the trimmed file immediately.
Reorder PDF Pages
Rearrange PDF page thumbnails visually via drag-and-drop to fix scan sequences or presentation order in your browse
Extract PDF Pages
Pull specific page numbers or ranges out of a large PDF into a standalone document while keeping fonts and vectors
JPG to PDF
Use Seoffix JPG to PDF (jpg to pdf) to process inputs instantly in your browser—100% free, private, and no signup r
PNG to PDF
Pack lossless PNG screenshots, diagrams, and transparent graphics into a crisp multi-page PDF document.
PDF to JPG
Use Seoffix PDF to JPG (pdf to jpg) to process inputs instantly in your browser—100% free, private, and no signup r
PDF to PNG
Export PDF pages as sharp, lossless PNG raster images that preserve fine typography, line art, and UI wireframes.
Compress PDF
Use Seoffix Compress PDF (compress pdf) to process inputs instantly in your browser—100% free, private, and no sign
Protect PDF
Encrypt sensitive PDF files with strong AES password protection to restrict unauthorized opening, printing, or copy
Unlock PDF
Use Seoffix Unlock PDF (unlock pdf) to process inputs instantly in your browser—100% free, private, and no signup r
Watermark PDF
Stamp custom text or semi-transparent logo watermarks across PDF pages with configurable opacity, angle, and placem
Add Page Numbers
Insert formatted header or footer page numbers (such as Page 1 of N) across PDF reports, legal filings, and manuals
Grayscale PDF
Convert full-color PDF pages and embedded graphics to clean black-and-white grayscale to save printer toner and fil
Repair PDF
Rebuild damaged cross-reference tables and recover readable pages from partially corrupted or truncated PDF downloa
Flatten PDF
Merge interactive AcroForm inputs, annotations, and signature layers permanently into static, non-editable PDF page
Word to PDF
Use Seoffix Word to PDF (word to pdf) to process inputs instantly in your browser—100% free, private, and no signup
Excel to PDF
Use Seoffix Excel to PDF (excel to pdf) to process inputs instantly in your browser—100% free, private, and no sign
PowerPoint to PDF
Use Seoffix PowerPoint to PDF (powerpoint to pdf) to process inputs instantly in your browser—100% free, private, a
PDF to Word Converter (Convert PDF to Word Online Free)
Free online PDF to Word Converter by Seoffix Design Lab. Run fast, accurate pdf to word converter checks in your br
PDF to Text
Extract clean UTF-8 plain text from PDF documents for indexing, corpus analysis, quoting, or translation workflows.
Sign PDF (eSign)
Draw, type, or place your visual electronic signature and date stamp onto PDF contracts, NDAs, and approval forms.
Edit PDF (Annotations)
Add text callouts, highlights, shapes, and review annotations directly onto existing PDF pages inside your browser.
Crop PDF
Trim excess white margins, printer crop marks, or uneven scan borders uniformly across single or multi-page PDF fil
Compress PDF to 100KB
Use Seoffix Compress PDF to 100KB (compress pdf to 100kb) to process inputs instantly in your browser—100% free, pr
Compress PDF to 200KB
Use Seoffix Compress PDF to 200KB (compress pdf to 200kb) to process inputs instantly in your browser—100% free, pr
Compress PDF to 500KB
Use Seoffix Compress PDF to 500KB (compress pdf to 500kb) to process inputs instantly in your browser—100% free, pr
Compress PDF to 1MB
Use Seoffix Compress PDF to 1MB (compress pdf to 1mb online) to process inputs instantly in your browser—100% free,
Universal Document Converter
Convert office documents, ebooks, spreadsheets, markup files, and images across standard archive and publishing for
ODT to PDF
Convert OpenDocument Text (.odt) files from LibreOffice or OpenOffice into universally printable PDF documents.
ODS to PDF
Export OpenDocument Spreadsheets (.ods) into cleanly formatted PDF tables with preserved cell borders and numbers.
ODP to PDF
Convert OpenDocument Presentations (.odp) into portable PDF slide decks that open consistently on every device.
PDF to ODT
Extract text and structure from PDF documents into editable OpenDocument (.odt) files for LibreOffice Writer.
PDF to ODS
Pull tabular data from PDF statements and reports into editable OpenDocument Spreadsheet (.ods) workbooks.
EPUB to PDF
Convert reflowable EPUB ebooks into paginated, print-ready PDF documents with preserved chapter headings and images
MOBI to PDF
Transform legacy Kindle MOBI ebook files into standard PDF documents readable on any desktop, tablet, or e-reader.
AZW3 to PDF
Convert unencrypted Kindle Format 8 (.azw3) ebooks into clean PDF pages with intact typography and illustrations.
DJVU to PDF
Convert scanned technical manuals and archival DjVu (.djvu) documents into standard searchable or printable PDFs.
PDF to EPUB
Reflow PDF articles, manuscripts, and public-domain books into responsive EPUB ebooks for comfortable mobile readin
PDF to MOBI
Convert PDF manuscripts and study guides into MOBI ebook packages compatible with older e-ink reading devices.
RTF to PDF
Convert Rich Text Format (.rtf) documents into clean, fixed-layout PDF files with intact bold, italic, and list sty
Text to PDF
Wrap plain UTF-8 .txt notes, logs, or source listings into cleanly margined, paginated PDF documents.
HTML to PDF
Render raw HTML snippets or styled web documents into downloadable PDFs with preserved CSS typography and tables.
PDF to Markdown
Extract headings, paragraphs, lists, and tables from PDF documents into clean Markdown (.md) files for docs and wik
Markdown to PDF
Compile Markdown (.md) documentation, READMEs, and technical specs into clean, print-styled PDF deliverables.
CSV to PDF
Format comma-separated CSV datasets into neat, paginated PDF data tables ready for executive sharing and archiving.
XML to PDF
Render structured XML data records into readable, human-friendly PDF summary documents without manual XSLT setup.
Remove PDF Metadata
Strip hidden Title, Author, Producer, Creator tool names, and XMP document properties from PDF files before externa
Sanitize PDF
Remove embedded JavaScript actions, hidden form triggers, attachments, and metadata layers from untrusted PDF files
Compare PDF Text
Compare two revisions of a PDF contract or specification side by side to highlight added, deleted, and modified pas
Verify PDF Signatures
Inspect cryptographic digital signatures inside signed PDFs to check signer certificate details and post-signing ta
Booklet Page Creator
Impose sequential PDF pages into printer-spread saddle-stitch booklet order ready for duplex folding and binding.
Pages Per Sheet (N-Up)
Tile 2, 4, 6, or 9 PDF pages onto each physical sheet (N-Up imposition) for compact lecture handouts and review pro
Halve PDF Pages
Split double-page scanned book spreads down the center spine into sequential single-page portrait PDF views.
Change PDF Page Size
Rescale and re-center PDF pages cleanly onto standard ISO A4, A3, A5, US Letter, or Legal paper dimensions.
PDF Bleed Box Sizer
Inspect and set TrimBox, BleedBox, and MediaBox dimensions (such as 3mm print bleed) on press-ready PDF artwork.
Forensic Redact PDF
Permanently burn out confidential SSNs, account numbers, names, and sensitive text from underlying PDF content stre
Convert PDF to PDF/A
Convert standard PDFs into ISO-standardized PDF/A archival files with self-contained fonts for long-term legal rete
PDF Form Filler
Fill text fields, checkboxes, radio buttons, and date inputs inside interactive PDF forms cleanly in your browser.
Local OCR Engine
Run optical character recognition (OCR) on scanned image-only PDFs to unlock selectable, searchable text layers.
Document Passage Search
Search passages, jump to exact page citations, and extract targeted answers from lengthy PDF manuals and research p
PDF Extractive Summarizer
Condense multi-page PDF reports, whitepapers, and academic articles into structured executive bullet takeaways.
Document Excerpt Extractor
Extract key sections and passages from foreign-language PDF documents for rapid cross-language review and translati
10 Keyword Research & Search Intent Audit Tools
Discover high-intent search terms, analyze organic keyword density, check real-time keyword competition, and uncover high-CTR long-tail query clusters.
Keyword Research Tool & Topic Cluster Builder
Run complete keyword discovery, KD 0–100 scoring, search intent mapping, and automated SEO topic cluster grouping i
Long-Tail Keyword Generator & Question Finder
Uncover hundreds of live autocomplete long-tail keywords, buyer modifiers, question queries, and A-to-Z expansions
Keyword Difficulty Checker & SERP Intent Analyzer
Check bulk Keyword Difficulty (KD 0–100), search intent classification, authority requirements, and low-competition
Keyword Position Checker
Free Keyword Position Checker by Seoffix Design Lab: instant keyword and ranking diagnostics in your browser with f
Keyword Density Checker
Free Keyword Density Checker by Seoffix Design Lab: instant keyword and keyword density checker diagnostics in your
Keywords Suggestion Tool
Free Keywords Suggestion Tool by Seoffix Design Lab: instant keyword and seo diagnostics in your browser with full
Keyword Suggestion Tool v2
Uncover high-intent search queries, question modifiers, and semantic topic clusters for content briefs and landing
Keywords Rich Domains Suggestions Tool
Free Keywords Rich Domains Suggestions Tool by Seoffix Design Lab: instant keyword and suggestion tool diagnostics
Long Tail Keyword Suggestion
Expand broad seed topics into low-competition, multi-word long-tail search phrases that capture specific buyer and
Questions Explorer Tool
Free Questions Explorer Tool by Seoffix Design Lab: instant keyword and explorer diagnostics in your browser with f
11 High-Authority Backlink & Anchor Profile Tools
Audit inbound links, generate high-quality backlink opportunities, verify anchor distributions, and detect toxic link velocity to safeguard your domain rating.
Backlink Maker
Free Backlink Maker by Seoffix Design Lab: instant backlink and backlinks diagnostics in your browser with full pri
Backlink Checker
Free Backlink Checker by Seoffix Design Lab: instant backlink checker and checker diagnostics in your browser with
Link Analyzer
Free Link Analyzer by Seoffix Design Lab: instant website link and website link analyzer diagnostics in your browse
Algorithmic Site Value & Traffic Appraisal Calculator
Estimate domain asset valuation, monthly organic traffic worth, and advertising revenue benchmarks from public web
Website Links Count Checker
Count total links on any webpage broken down into internal navigation routes, external outbound URLs, and nofollow
Broken Links Finder
Free Broken Links Finder by Seoffix Design Lab: instant broken links and broken link checker diagnostics in your br
Link Tracker
Free Link Tracker by Seoffix Design Lab: instant link tracker and tracker diagnostics in your browser with full pri
Long to Short Link Converter
Free Long to Short Link Converter by Seoffix Design Lab: instant url and url shortener diagnostics in your browser
Moz Backlink Extractor
Free Authority Backlink Extractor by Seoffix Design Lab: instant backlink and tool diagnostics in your browser with
Youtube Backlinks Generator
Generate embed and discovery ping links for public YouTube video URLs to speed up indexing across video aggregators
Bulk URL Shortener
Free Bulk URL Shortener by Seoffix Design Lab: instant link and url diagnostics in your browser with full privacy a
37 Core Webmaster Architecture & Technical SEO Tools
Generate XML sitemaps, build and test robots.txt directives, format source code, analyze page speed, and verify HTTP status codes effortlessly.
Custom URL Shortener, QR Code & Click Tracker
Create clean https://seoffix.com/s/ short links with custom slugs, UTM campaign tags, threat-screened destinations,
Robots.txt Generator
Free Robots.txt Generator by Seoffix Design Lab: instant robots.txt file and search engine diagnostics in your brow
XML Sitemap Generator
Free XML Sitemap Generator by Seoffix Design Lab: instant xml sitemap and sitemap generator diagnostics in your bro
Online Ping Website Tool
Free Online Ping Website Tool by Seoffix Design Lab: instant ping and tool diagnostics in your browser with full pr
URL Rewriting Tool
Use Seoffix URL Rewriting Tool (free online url rewriting tool) to process inputs instantly in your browser—100% fr
URL Encoder / Decoder
Percent-encode reserved URI characters for safe query parameters or decode escaped URLs back into readable UTF-8 te
Webpage Screen Resolution Simulator
Preview how any webpage renders across desktop monitors, laptops, tablets, and mobile smartphone viewport dimension
Page Size Checker
Measure uncompressed HTML document byte weight and kilobyte payload size to diagnose bloated templates and slow fir
Suspicious Domain Checker
Free Suspicious Domain Checker by Seoffix Design Lab: instant domain and malware diagnostics in your browser with f
Website Screenshot Generator
Capture clean full-width browser screenshots of any public HTTPS webpage for audits, client decks, or design archiv
Get Source Code of Webpage
Free Get Source Code of Webpage by Seoffix Design Lab: instant source code and view the source code diagnostics in
Page Speed Checker
Measure live server TTFB, HTML download duration, and asset weight to pinpoint bottlenecks hurting Core Web Vitals.
Email Privacy
Free Email Privacy by Seoffix Design Lab: instant email and email privacy diagnostics in your browser with full pri
Get HTTP Headers
Fetch raw HTTP/1.1 and HTTP/2 response headers including status codes, Cache-Control, Server, Set-Cookie, and HSTS
Mobile Friendly Test
Free Mobile Friendly Test by Seoffix Design Lab: instant mobile friendly and mobile friendly test diagnostics in yo
Check GZIP compression
Free Check GZIP compression by Seoffix Design Lab: instant gzip and compression diagnostics in your browser with fu
All-In-One Full Comprehensive SEO Site Auditor
Run a 236-checkpoint technical SEO and AI search readiness audit covering crawlability, Core Web Vitals, schema, an
Pagespeed Insights Checker
Audit mobile and desktop loading performance, Core Web Vitals thresholds, and render-blocking asset opportunities.
Network Speed Tester
Free Network Speed Tester by Seoffix Design Lab: instant internet speed test and download speed diagnostics in your
Open Graph Checker
Free Open Graph Checker by Seoffix Design Lab: instant open graph and tag diagnostics in your browser with full pri
Open Graph Generator
Free Open Graph Generator by Seoffix Design Lab: instant open graph and generator diagnostics in your browser with
Twitter Card Generator
Free Twitter Card Generator by Seoffix Design Lab: instant twitter card and generator diagnostics in your browser w
Schema Markup Generator
Free Schema Markup Generator by Seoffix Design Lab: instant json-ld and structured data diagnostics in your browser
Universal CMS, Script & Theme Detector
Identify the CMS, eCommerce engine, WordPress theme, frontend framework, analytics scripts, and CDN behind any live
Online Traceroute Tool
Trace network packet hops, router IP addresses, and round-trip latency from the probe server to any target hostname
Security Headers Auditor
Inspect live HTTP security headers including HSTS, Content-Security-Policy, X-Frame-Options, Referrer-Policy, and P
Subdomain Finder
Discover active public subdomains and certificate-transparency hostnames associated with any root domain.
Redirect Chain & Header Tracer
Use Seoffix Redirect Chain & Header Tracer (redirect checker) to process inputs instantly in your browser—100% free
Schema Markup & JSON-LD Generator
Create clean, Rich-Results-compliant JSON-LD structured data snippets for articles, FAQs, breadcrumbs, organization
Social Media & Open Graph Card Previewer
Preview how your webpage title, description, and featured image render on Facebook, X, LinkedIn, and messaging apps
Robots.txt Tester & Crawler Validator
Test custom robots.txt rules against target URLs and specific search or AI crawler user-agents (Googlebot, Bingbot,
Multi-Language Hreflang Tag Generator
Generate reciprocal rel="alternate" hreflang HTML link tags or XML annotations for multi-language and regional webs
XML Sitemap Syntax Validator & Auditor
Validate XML sitemap well-formedness, namespace declarations, URL count limits, and canonical HTTPS consistency.
Email Header Decoder & Route Analyzer
Parse raw RFC 5322 email headers to trace SMTP relay hops, delays, SPF alignment, DKIM signatures, and DMARC verdic
HTTP Methods & Allowed Verbs Auditor
Probe an endpoint's OPTIONS/Allow response to verify enabled HTTP verbs (GET, POST, PUT, DELETE, TRACE) and CORS pr
Enterprise Multi-Threat Security & Malware Scanner
Scan any public URL for exposed security headers, TLS configuration weaknesses, DNSBL listings, and safe-browsing f
PWA Compatibility & Installability Auditor
Audit a site's Web App Manifest, icons, HTTPS service-worker registration, and mobile installability requirements.
22 Website Performance, Indexation & Tracking Suite
Track Google index status, monitor server ping response times, calculate Alexa rankings, and trace complex redirect chains in milliseconds.
My IP Address
Free My IP Address by Seoffix Design Lab: instant ip address and ipv4 diagnostics in your browser with full privacy
Google Malware Checker
Check whether a domain triggers public malware advisories, phishing warnings, or unsafe-browsing flags before visit
Enterprise DNS, WHOIS & Network Forensics Inspector
Free Enterprise DNS, WHOIS & Network Forensics Inspector by Seoffix Design Lab: instant domain and domain name diag
Domain into IP
Free Domain into IP by Seoffix Design Lab: instant domain and ip address diagnostics in your browser with full priv
www Redirect Checker
Verify whether www and apex domain variants consolidate cleanly via a single 301 redirect without duplicate indexab
Mozrank Checker
Estimate link-equity strength and page-level authority signals for candidate outreach domains and competitor URLs.
Server Status Checker
Test HTTP response codes, response latency, and live server availability across one or multiple URLs simultaneously
Google Index Checker
Use Seoffix Google Index Checker (google index checker) to process inputs instantly in your browser—100% free, priv
Class C Ip Checker
Check whether multiple domains share the same Class C IPv4 /24 subnet to spot co-hosted footprints across link netw
Code to Text Ratio Checker
Free Code to Text Ratio Checker by Seoffix Design Lab: instant code to text ratio and text to code ratio diagnostic
What is my Browser
Free What is my Browser by Seoffix Design Lab: instant browser and online utility diagnostics in your browser with
Google Cache Checker
Free Google Cache Checker by Seoffix Design Lab: instant cache and cached pages diagnostics in your browser with fu
Search Engine Spider Simulator
Free Search Engine Spider Simulator by Seoffix Design Lab: instant spider and search engines diagnostics in your br
Domain Authority Checker
Use Seoffix Domain Authority Checker (domain authority checker) to process inputs instantly in your browser—100% fr
Page Authority Checker
Use Seoffix Page Authority Checker (page authority checker) to process inputs instantly in your browser—100% free,
Universal Social Signal Counter & Engagement Tracker
Free Universal Social Signal Counter & Engagement Tracker by Seoffix Design Lab: instant tool and social media diag
Apps Rank Tracking Tool
Free Apps Rank Tracking Tool by Seoffix Design Lab: instant ranking and keyword diagnostics in your browser with fu
Twitter Graph Checker
Validate twitter:card, twitter:title, twitter:description, and twitter:image tags on any live URL before posting to
Is Your Website Down Right Now
Free Is Your Website Down Right Now by Seoffix Design Lab: instant monitor and whether the website diagnostics in y
Website Hit Counter
Free Website Hit Counter by Seoffix Design Lab: instant counter and free diagnostics in your browser with full priv
Browser Fingerprint & Tracking Auditor
Inspect the canvas, WebGL, audio, timezone, font, and screen entropy signals your browser exposes to anti-bot track
UTM Campaign Builder
Build consistent Google Analytics 4 UTM tracking URLs with utm_source, utm_medium, utm_campaign, utm_term, and utm_
13 Proxy Intelligence & Network Privacy Diagnostics
Verify IP geolocations, test live proxy servers, inspect HTTP request headers, and audit client anonymity with privacy-first network probes.
Geo IP Locator, ASN & Network Intelligence Tool
Locate any IPv4, IPv6, or domain with dual GeoLite2 + DB-IP city accuracy, BGP ASN, CIDR prefix, reverse PTR DNS, m
Free Proxy List
Free Free Proxy List by Seoffix Design Lab: instant proxy and list diagnostics in your browser with full privacy an
CSR Generation
Free CSR Generation by Seoffix Design Lab: instant csr and certificate diagnostics in your browser with full privac
CSR Decoder
Free CSR Decoder by Seoffix Design Lab: instant decode and csr decoder diagnostics in your browser with full privac
Certificate Decoder
Free Certificate Decoder by Seoffix Design Lab: instant certificate and decode diagnostics in your browser with ful
Certificate Key Matcher
Free Certificate Key Matcher by Seoffix Design Lab: instant certificate and private key diagnostics in your browser
Check CSR
Free Check CSR by Seoffix Design Lab: instant csr and certificate diagnostics in your browser with full privacy and
SSL Converter
Free SSL Converter by Seoffix Design Lab: instant format and ssl converter diagnostics in your browser with full pr
SSL Checker
Free SSL Checker by Seoffix Design Lab: instant ssl certificate and checker diagnostics in your browser with full p
Password Strength Checker
Free Password Strength Checker by Seoffix Design Lab: instant password and password strength diagnostics in your br
Password Encryption Utility
Free Password Encryption Utility by Seoffix Design Lab: instant password and password encryption diagnostics in you
Password Generator
Free Password Generator by Seoffix Design Lab: instant password generator and secure password diagnostics in your b
Disavow File Generator
Free Disavow File Generator by Seoffix Design Lab: instant disavow and disavow file generator diagnostics in your b
10 Domain Authority, WHOIS & DNS Diagnostics
Lookup authoritative WHOIS registries, calculate domain age, inspect DNS record propagation, and audit domain IP hosting servers.
Domain Age Checker
Free Domain Age Checker by Seoffix Design Lab: instant age checker and domain age checker diagnostics in your brows
Blacklist Lookup
Query major DNS-based spam and abuse blocklists (DNSBLs) to verify whether your mail or web server IP is listed.
Domain Hosting Checker
Free Domain Hosting Checker by Seoffix Design Lab: instant domain and web host diagnostics in your browser with ful
Find DNS records
Free Find DNS records by Seoffix Design Lab: instant dns record and lookup diagnostics in your browser with full pr
Bulk Domain Availability Checker
Free Bulk Domain Availability Checker by Seoffix Design Lab: instant domain and bulk diagnostics in your browser wi
Bulk Domain Age Checker
Free Bulk Domain Age Checker by Seoffix Design Lab: instant domain and domain age checker diagnostics in your brows
Blog Finder
Find active industry blogs, guest-editorial publications, and niche content hubs relevant to your topic keywords.
Bulk Facebook ID Finder
Free Bulk Facebook ID Finder by Seoffix Design Lab: instant profile and tool diagnostics in your browser with full
Global DNS Propagation Checker
Check how A, AAAA, CNAME, MX, NS, and TXT DNS changes propagate across global recursive resolvers in real time.
ASN & BGP Route Lookup Tool
Look up Autonomous System Numbers (ASNs), organization ownership, announced IPv4/IPv6 prefixes, and network peering
30 High-Resolution Image Compression & Converter Tools
Convert between WebP, PNG, JPG, and ICO formats, resize image dimensions, optimize file sizes, and reverse image search seamlessly.
Image to Text Converter (OCR Scanner)
Extract editable UTF-8 text from JPG, PNG, WebP, screenshots, and scanned notes using native Tesseract 5 OCR in Eng
Image Crop Tool
Free Image Crop Tool by Seoffix Design Lab: instant crop and crop image diagnostics in your browser with full priva
Image Pencil Effect
Free Image Pencil Effect by Seoffix Design Lab: instant photo and pencil diagnostics in your browser with full priv
Image to Base64
Use Seoffix Image to Base64 (free online image to base64) to process inputs instantly in your browser—100% free, pr
Image Optimizer
Free Image Optimizer by Seoffix Design Lab: instant compress and image optimizer diagnostics in your browser with f
Image Resizer
Free Image Resizer by Seoffix Design Lab: instant image resizer and resize diagnostics in your browser with full pr
Reverse Image Search & Photo Finder (Image Search Techniques)
Free Reverse Image Search & Photo Finder by Seoffix Design Lab: instant reverse image search and search by image di
Favicon Generator Tool
Free Favicon Generator Tool by Seoffix Design Lab: instant favicon and generator diagnostics in your browser with f
Base64 to Image
Decode Base64 data URIs or raw encoded strings back into previewable, downloadable PNG, JPG, WebP, or SVG image fil
Text to Image
Free Text to Image by Seoffix Design Lab: instant ai and generator diagnostics in your browser with full privacy an
Rotate Image Online
Free Rotate Image Online by Seoffix Design Lab: instant image and rotate diagnostics in your browser with full priv
WASM Audio Converter
Convert audio tracks between MP3, WAV, OGG, AAC, M4A, and FLAC directly in your browser using client-side WebAssemb
WebP & Image Format Converter
Convert images seamlessly between WebP, AVIF, PNG, JPG, GIF, and BMP formats locally without uploading private phot
Browser Screen & Mic Recorder
Capture your desktop screen, application window, or browser tab with optional microphone narration directly to WebM
Video to GIF Maker
Use Seoffix Video to GIF Maker (video to gif) to process inputs instantly in your browser—100% free, private, and n
Video to MP3 Extractor
Extract the audio track from MP4, WebM, or MOV video files into a clean MP3 download right inside your browser.
Interactive Meme Generator
Use Seoffix Interactive Meme Generator (meme generator) to process inputs instantly in your browser—100% free, priv
QR Code Scanner & Reader
Decode QR codes instantly from an uploaded screenshot/photo or live webcam stream without installing a mobile app.
Image EXIF & Metadata Privacy Stripper
Strip hidden GPS coordinates, camera serial numbers, timestamps, and EXIF/IPTC metadata from photos before sharing
Image Privacy Blur & Pixelate Censor
Blur or pixelate sensitive faces, license plates, API keys, and personal details on screenshots locally in your bro
Visual Audio Trimmer & Ringtone Cutter
Visualize audio waveforms, drag start/end markers to cut unwanted intros or silence, and export clean trimmed clips
Audio Volume Booster & Sound Amplifier
Amplify quiet voice recordings or podcast tracks cleanly in your browser with gain control and clipping protection.
Vector SVG to High-Resolution PNG & JPG Converter
Rasterize scalable vector SVG logos and icons into crisp PNG or JPG bitmaps at custom 1x, 2x, or 4x pixel resolutio
Interactive Color Wheel & Harmony Studio
Explore complementary, triadic, analogous, and split-complementary color palettes on an interactive wheel with HEX,
Batch Image Compressor
Free online Batch Image Compressor by Seoffix Design Lab. Run fast, accurate batch image compressor checks in your
Compress JPG
Reduce JPEG photo byte size with smart chroma and quality tuning while avoiding blocky compression artifacts.
Compress PNG
Shrink PNG UI screenshots, icons, and transparent graphics cleanly while preserving sharp edges and alpha channels.
Compress WebP
Optimize modern WebP images to minimal byte sizes for fast mobile Core Web Vitals and responsive picture elements.
Convert HEIC Photo
Convert Apple iPhone HEIC/HEIF photos into widely compatible, compressed JPG or PNG files directly in your browser.
YouTube Thumbnail Downloader
Free YouTube Thumbnail Downloader by Seoffix Design Lab: instant thumbnail and download diagnostics in your browser
41 Interactive Utilities, Viral Simulators & Everyday Helpers
Aim trainers, coin flippers, countdown timers, zodiac finders, morse code decoders, fancy glitch text generators, and quick web helpers.
Adsense Calculator
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Age Calculator
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Average Calculator
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Binary Calculator & Bitwise Logic Engine
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Binary to Text
Free Binary to Text by Seoffix Design Lab: instant binary to text and converter diagnostics in your browser with fu
Binary Translator
Free Binary Translator by Seoffix Design Lab: instant binary translator and translator diagnostics in your browser
Bitcoin Price Calculator
Free Bitcoin Price Calculator by Seoffix Design Lab: instant calculator and bitcoin diagnostics in your browser wit
Credit Card Generator
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Credit Card Validator
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HTML Compressor
Free HTML Compressor by Seoffix Design Lab: instant html and compress diagnostics in your browser with full privacy
JS Minifier
Free JS Minifier by Seoffix Design Lab: instant javascript and minify diagnostics in your browser with full privacy
CSS Minifier
Free CSS Minifier by Seoffix Design Lab: instant css minifier and css code diagnostics in your browser with full pr
CSV to JSON
Free CSV to JSON by Seoffix Design Lab: instant convert and tool diagnostics in your browser with full privacy and
Currency Converter
Free Currency Converter by Seoffix Design Lab: instant currency and exchange rate diagnostics in your browser with
Decimal to ASCII
Free Decimal to ASCII by Seoffix Design Lab: instant ascii and decimal diagnostics in your browser with full privac
Diff Checker
Free Diff Checker by Seoffix Design Lab: instant compare and difference diagnostics in your browser with full priva
Bulk Email Validator
Free Bulk Email Validator by Seoffix Design Lab: instant email and bulk email diagnostics in your browser with full
Fake Address Generator
Free Fake Address Generator by Seoffix Design Lab: instant address and code diagnostics in your browser with full p
Hex Calculator
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HTML Encoder
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HTML Decoder
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Numbers to Words Converter
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Readability Checker
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Roman Numerals Date Converter
Free Roman Numerals Date Converter by Seoffix Design Lab: instant roman numeral and date diagnostics in your browse
Text to Binary
Free Text to Binary by Seoffix Design Lab: instant text to binary and convert diagnostics in your browser with full
Text To Speech Converter
Free Text To Speech Converter by Seoffix Design Lab: instant text and voice diagnostics in your browser with full p
Urdu Typing Tool
Free Urdu Typing Tool by Seoffix Design Lab: instant using english and using english alphabets diagnostics in your
Word Combiner
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XML to JSON
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Aim Trainer & Reflex Benchmark
Measure mouse click accuracy, target acquisition speed, and millisecond reflex latency inside an interactive browse
Virtual 3D Coin Flipper
Flip a fair cryptographically seeded virtual coin with 3D animation and running heads-versus-tails session tallies.
3D Virtual Dice Roller
Roll one or multiple standard d6 or polyhedral tabletop dice (d4, d8, d10, d12, d20) with instant sum totals.
Online Precision Stopwatch
Track elapsed time with millisecond precision, split-lap recording, and keyboard start/stop controls in your browse
Online Countdown Timer with Alarm
Set custom hour, minute, and second countdowns for Pomodoro focus sprints, presentations, or workouts with an audio
Zodiac Sign & Astrology Calculator
Find Western sun sign dates, elemental traits, and ruling planetary profile from any birth month and day.
Morse Code & Audio Translator
Translate English text into international ITU dots and dashes (or decode Morse back to text) with live audio tone p
Audio Tone & Frequency Generator
Generate pure sine, square, sawtooth, and triangle audio test tones from 20 Hz to 20,000 Hz for speaker and hearing
BPM Counter & Tap Tempo
Tap along to any song or rhythm on your spacebar or touch screen to measure exact musical tempo in Beats Per Minute
Online Voice & Audio Recorder
Record crisp microphone voice notes directly in your browser with live waveform feedback and local WAV/WebM downloa
Audio Pitch & Playback Speed Shifter
Shift musical pitch in semitones or adjust playback tempo independently on uploaded audio tracks inside your browse
Morse Code Audio Player & Synthesizer
Synthesize downloadable WAV audio beeps at custom WPM speeds and sidetone Hz frequencies from any Morse or text mes
38 Financial, Health & Everyday Life Calculators
Precision financial projections, loan EMI calculators, compound interest estimators, BMI matrices, calorie planning, and duration math.
Loan EMI & Mortgage Calculator
Calculate monthly EMI installments, total interest payable, and full principal-vs-interest amortization schedules f
Compound Profit & Interest Calculator
Project long-term investment growth across daily, monthly, quarterly, or annual compounding intervals with recurrin
World Clock & Timezone Comparator
Compare current local times across global cities and UTC offsets side by side to schedule international team meetin
BMI & Health Matrix Calculator
Compute Body Mass Index (BMI) across metric (kg/cm) or imperial (lb/ft-in) units with standard adult weight-categor
Calorie & Macro Calculator
Estimate Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) with protein, carb, and fat macro tar
Sales Tax / GST / VAT Calculator
Calculate inclusive and exclusive Sales Tax, GST, or VAT amounts to find net pre-tax price, tax component, and gros
Between Dates & Duration Calculator
Count exact calendar days, business weekdays, weeks, months, and years elapsed between any two calendar dates.
GPA & College Grade Calculator
Compute semester and cumulative college GPA weighted by credit hours across standard 4.0 and plus/minus letter-grad
Percentage & Discount Calculator
Free online Percentage & Discount Calculator by Seoffix Design Lab. Run fast, accurate percentage & discount calcul
Pet Real Age Calculator
Estimate dog and cat physiological life-stage equivalents in human years adjusted for breed size and developmental
Electricity Bill & Appliance Cost Calculator
Estimate daily, monthly, and annual kWh power consumption and utility bill cost from appliance wattage and runtime
Scientific Calculator Online
Evaluate trigonometry, logarithms, exponents, factorials, roots, and parenthesized scientific expressions in radian
Ohm's Law & Power Calculator
Solve electrical Voltage (V), Current (I), Resistance (R), and Wattage Power (P) from any two known circuit values.
Tip Calculator & Bill Splitter
Calculate gratuity amounts at custom tip percentages and split the restaurant bill evenly per person in seconds.
Standard Deviation & Variance Calculator
Compute population and sample standard deviation, variance, mean, and confidence metrics from raw numeric datasets.
Salary & Take-Home Pay Estimator
Convert hourly wages into daily, weekly, biweekly, monthly, and annual gross pay adjusted for hours worked and paid
Inflation Impact & Purchasing Power Calculator
Model how annual CPI inflation erodes cash purchasing power over time or project future cost equivalents.
Crypto & Stock Profit / ROI Calculator
Calculate net trading profit, ROI percentage, and break-even exit price after exchange buy/sell fees on crypto or s
Auto & Car Loan Payment Calculator
Estimate monthly auto loan payments, trade-in equity impact, down payment, sales tax, and total interest over the l
Savings Goal & Target Wealth Calculator
Calculate the monthly contribution or timeframe needed to reach a target savings milestone at your expected annual
Discount, Sale Price & Savings Calculator
Compute final sale price, stacked double-discount totals, and exact money saved during retail promotions.
Time Duration & Date Interval Calculator
Add or subtract hours, minutes, and seconds or calculate exact shift duration between two clock timestamps.
Create Electronic Invoice
Build structured electronic invoices with itemized line totals, tax breakdowns, buyer/seller IDs, and machine-reada
Validate E-Invoice
Validate electronic invoice XML payloads against UBL/CII schema rules, tax math totals, and mandatory compliance fi
Attach Invoice XML
Embed structured UBL/ZUGFeRD/Factur-X invoice XML inside a human-readable PDF to produce hybrid compliant e-invoice
GST Calculator
Calculate Indian CGST, SGST, and IGST splits across 5%, 12%, 18%, and 28% slabs for both GST-inclusive and exclusiv
HSN & SAC Lookup
Search Harmonized System of Nomenclature (HSN) goods codes and Services Accounting Codes (SAC) with applicable GST
Rupees in Words
Spell Indian Rupee amounts in lakhs and crores into formal English cheque and GST tax-invoice words instantly.
MSME 45-Day Payment Date
Calculate statutory Section 43B(h) MSME 15-day and 45-day vendor payment due dates and fiscal-year deduction cutoff
Proforma Invoice Generator
Create itemized proforma invoices with GSTIN fields, HSN/SAC codes, tax summaries, and clean printable PDF export.
Break-Even ROAS Calculator
Calculate break-even Return on Ad Spend (ROAS), target CPA, and contribution margin after COGS, shipping, and payme
Cart Recovery ROI Engine
Project monthly recovered revenue from abandoned-cart email, SMS, and WhatsApp flows based on cart volume and recov
Price & Margin Engine
Model retail selling price, gross margin percentage, markup multiple, and net unit profit across product SKU tiers.
Customer Lifetime Value (CLV)
Estimate Customer Lifetime Value (CLV/LTV) from average order value, purchase frequency, gross margin, and retentio
CAC Payback Period
Calculate how many months it takes for gross margin from a new customer cohort to recover Customer Acquisition Cost
E-Commerce SKU Generator
Generate consistent, warehouse-friendly alphanumeric SKU codes from brand, category, color, size, and variant attri
Retainer ROI Model
Model projected organic traffic growth, lead conversion value, and monthly agency retainer ROI for prospective clie
Aspect Ratio Calculator
Calculate exact pixel dimensions and proportional width-to-height ratios (16:9, 4:3, 1:1, 9:16) for video and respo
19 Scientific Unit & Metric Conversion Utilities
Convert length, weight, temperature, and digital storage units with zero rounding loss and real-time bi-directional input synchronization.
Temperature Converter
Convert temperatures accurately between Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) with formula br
Weight & Mass Converter
Convert mass and weight measurements across kilograms, grams, milligrams, metric tonnes, pounds (lb), ounces (oz),
Length & Distance Converter
Convert distances between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical mi
Digital Storage Converter
Convert data sizes across bits, bytes, KB/KiB, MB/MiB, GB/GiB, TB/TiB, and PB using both decimal SI and binary IEC
Fuel Consumption Converter & Trip Cost
Convert fuel economy between MPG (US/UK), km/L, and L/100km while estimating total trip fuel volume and cost.
Area Converter - Land & Metric Area Calculator
Convert land and surface areas across square meters, hectares, acres, square feet, square yards, and regional land
Volume & Liquid Capacity Converter
Convert liquid and dry volumes between milliliters, liters, cubic meters, US/UK gallons, quarts, pints, cups, and f
Speed & Velocity Converter
Convert velocity measurements across km/h, mph, meters per second (m/s), feet per second, knots, and Mach number.
Pressure Units Converter
Convert pressure readings across Pascals (Pa), kilopascals, bar, PSI, standard atmospheres (atm), and Torr/mmHg.
Power & Mechanical Work Converter
Convert mechanical and electrical power units across Watts, kilowatts, megawatts, metric/mechanical horsepower, and
Energy & Heat Converter
Convert energy and thermal work across Joules, kilojoules, calories, kilocalories, Watt-hours, kWh, BTU, and electr
Data Transfer Rate & Bandwidth Converter
Convert network throughput between bps, Kbps, Mbps, Gbps, and byte-per-second transfer rates (KB/s, MB/s, GB/s) plu
Angle Converter - Degrees, Radians & Arcseconds
Convert angular measurements precisely between degrees, radians, gradians, arcminutes, arcseconds, and full revolut
Force Units Converter - Newtons, lbf & Dynes
Convert mechanical force values across Newtons (N), kilonewtons (kN), dynes, pound-force (lbf), and kilogram-force
Torque Converter - N·m, Foot-Pounds & Inch-Pounds
Convert rotational torque between Newton-meters (N·m), foot-pounds (ft·lb), inch-pounds (in·lb), and kilogram-centi
Density Converter - kg/m³, g/cm³, lb/ft³ & lb/in³
Convert material density across kg/m³, g/cm³, g/mL, lb/ft³, and lb/in³ for engineering and physics calculations.
Illuminance Converter - Lux (lx) & Foot-Candles (fc)
Convert lighting intensity between Lux (lx), foot-candles (fc), phot, and lumen-per-square-meter studio targets.
Flow Rate Converter - LPM, GPM, m³/h & CFM
Convert volumetric fluid and airflow rates across liters per minute (LPM), US GPM, m³/h, m³/s, and cubic feet per m
Running Pace & Speed Converter
Convert running and cycling speeds between min/km, min/mile, km/h, and mph with projected 5K, 10K, half, and marath
41 Developer, Code & Server Configuration Utilities
JWT decoders, SQL formatters, JSON/YAML converters, Bcrypt generators, Apache to Nginx converters, CIDR calculators, and CVE lookup engines.
Interactive Regex Tester
Write, test, and debug regular expressions in real time with match highlighting, capture-group inspection, and flag
Cron Job Schedule Generator
Build 5-field Linux crontab expressions visually and preview upcoming execution timestamps in plain human English.
Fake Identity & Persona Generator
Create synthetic user profiles (names, usernames, job titles, test emails, and locales) for QA seeding and UI proto
WebRTC & Browser Privacy Leak Tester
Test whether your browser's WebRTC STUN candidates expose your local LAN or real public IP address behind a VPN.
JWT Decoder & Token Debugger (Decode JWT Online)
Decode JSON Web Token (JWT) Base64URL headers and payload claims locally in your browser without sending secrets ov
SQL Query Beautifier & Formatter
Beautify compact SQL queries with clean indentation, uppercase keywords, and aligned JOIN/WHERE clauses across majo
JSON to YAML Converter
Convert nested JSON configuration objects into clean, human-readable YAML files for Kubernetes, Docker, and CI pipe
YAML to JSON Converter
Parse YAML manifests and frontmatter blocks into strict, syntax-validated JSON objects ready for REST APIs.
Bcrypt Hash Generator & Verifier
Generate salted Bcrypt password hashes with configurable cost factors (rounds) and verify plaintext strings against
UUID v4 & Secret Key Generator
Generate cryptographically random RFC 4122 UUID v4 identifiers and high-entropy hex/base64 API secrets in single or
HTML to Markdown Converter
Convert rich HTML headings, links, lists, code blocks, and tables into clean GitHub-Flavored Markdown (.md) prose.
Apache .htaccess to Nginx Converter
Translate Apache mod_rewrite RewriteRule and Redirect directives into equivalent Nginx location and rewrite server
Nginx to Apache .htaccess Converter
Convert Nginx rewrite rules and redirect directives into Apache .htaccess mod_rewrite syntax for shared hosting mig
Content Security Policy (CSP) Builder
Compose strict Content-Security-Policy (CSP) directives for scripts, styles, images, frames, and connect-src origin
Security.txt RFC 9116 Generator
Generate an RFC 9116 /.well-known/security.txt disclosure policy with contact URI, PGP key link, and canonical expi
IP Subnet & CIDR Calculator
Calculate IPv4 CIDR network address, broadcast IP, usable host range, wildcard mask, and subnet bitmask from any IP
CVE Vulnerability & Exploit Search
Search public CVE advisories by identifier or vendor keyword to review CVSS severity scores, affected versions, and
Binary Calculator & Bitwise Logic Engine
Free Binary Calculator & Bitwise Logic Engine by Seoffix Design Lab: instant binary and calculator diagnostics in y
HTML Formatter & Beautifier
Indent and pretty-print minified or tangled HTML markup with clean tag nesting for easier debugging and code review
HTML Minifier & Code Compressor
Minify HTML documents by stripping comments, collapsing inter-tag spaces, and reducing payload size before deployme
CSS Formatter & Stylesheet Beautifier
Format compressed CSS stylesheets with clean selector spacing and indented property declarations for maintainable e
JavaScript Formatter & Code Beautifier
Pretty-print single-line or bundled JavaScript snippets with readable brace indentation and consistent statement br
HTML Entity Encoder
Encode reserved ASCII and extended Unicode symbols into named or numeric HTML entities to prevent markup breakage.
HTML Entity Decoder
Decode named (©, —) and numeric (', ') HTML character entities back into clean UTF-8 text.
Code Syntax Highlighter & Exporter
Format source code snippets with clean language-aware syntax highlighting ready to copy into documentation or slide
CSV to TSV Tab-Delimited Converter
Convert comma-separated CSV files into tab-delimited TSV tables while handling quoted fields containing embedded co
TSV to CSV Comma-Separated Converter
Transform tab-separated TSV exports from databases or spreadsheets into standard RFC 4180 comma-separated CSV files
JSON to CSV Spreadsheet Converter
Flatten structured JSON arrays of objects into downloadable CSV rows and column headers ready for Excel or Google S
List Randomizer & Item Shuffler (Randomise a List Online)
Shuffle line-separated names, raffle entries, or task queues using unbiased Fisher-Yates randomization in your brow
Interactive Markdown Table Generator
Build aligned GitHub-Flavored Markdown tables visually from grid cells or pasted spreadsheet rows in seconds.
AES-256 Encryption & Decryption Studio
Encrypt and decrypt sensitive text payloads client-side using standard AES-256 ciphers and PBKDF2 passphrase deriva
Punycode & IDN International Domain Converter
Convert Unicode Internationalized Domain Names (IDNs) to ASCII Punycode (xn--) labels and decode xn-- domains back
High-Speed HMAC Hash Generator
Compute keyed-hash message authentication codes (HMAC-SHA256, HMAC-SHA512, HMAC-SHA1) to verify webhook and API sig
Base58 (Bitcoin & IPFS) Encoder & Decoder
Encode raw text or hex bytes into Bitcoin/IPFS Base58 alphabet strings (omitting ambiguous 0, O, I, l characters) a
WhatsApp Direct Chat Link
Create click-to-chat wa.me links and QR codes with pre-filled greeting messages for customer support and sales inqu
QR Code Studio
Design high-resolution SVG and PNG QR codes for campaigns, menus, Wi-Fi, and vCards with clean scan contrast.
Bio Link Page Generator
Assemble a fast, mobile-first social bio landing snippet linking your top products, articles, videos, and contact c
JSON & XML Studio
Use Seoffix JSON & XML Studio (free online json & xml studio) to process inputs instantly in your browser—100% free
Regex Studio & Tester
Build, test, and benchmark regular expressions against multi-line sample inputs with live group extraction and matc
SHA-256 & SHA-512 Hash Studio
Compute cryptographic SHA-256, SHA-384, SHA-512, and SHA-1 digests client-side to verify file integrity and payload
Open Port Checker
Test whether specific TCP ports (80, 443, 22, 25, 3306, 8080) on a public IP or domain accept external connections.
20 Scientific Unit & Metric Conversion Utilities
Convert length, weight, temperature, and digital storage units with zero rounding loss and real-time bi-directional input synchronization.
Universal Document Converter
Convert office documents, ebooks, spreadsheets, markup files, and images across standard archive and publishing for
ODT to PDF
Convert OpenDocument Text (.odt) files from LibreOffice or OpenOffice into universally printable PDF documents.
ODS to PDF
Export OpenDocument Spreadsheets (.ods) into cleanly formatted PDF tables with preserved cell borders and numbers.
ODP to PDF
Convert OpenDocument Presentations (.odp) into portable PDF slide decks that open consistently on every device.
PDF to ODT
Extract text and structure from PDF documents into editable OpenDocument (.odt) files for LibreOffice Writer.
PDF to ODS
Pull tabular data from PDF statements and reports into editable OpenDocument Spreadsheet (.ods) workbooks.
EPUB to PDF
Convert reflowable EPUB ebooks into paginated, print-ready PDF documents with preserved chapter headings and images
MOBI to PDF
Transform legacy Kindle MOBI ebook files into standard PDF documents readable on any desktop, tablet, or e-reader.
AZW3 to PDF
Convert unencrypted Kindle Format 8 (.azw3) ebooks into clean PDF pages with intact typography and illustrations.
DJVU to PDF
Convert scanned technical manuals and archival DjVu (.djvu) documents into standard searchable or printable PDFs.
PDF to EPUB
Reflow PDF articles, manuscripts, and public-domain books into responsive EPUB ebooks for comfortable mobile readin
PDF to MOBI
Convert PDF manuscripts and study guides into MOBI ebook packages compatible with older e-ink reading devices.
RTF to PDF
Convert Rich Text Format (.rtf) documents into clean, fixed-layout PDF files with intact bold, italic, and list sty
Text to PDF
Wrap plain UTF-8 .txt notes, logs, or source listings into cleanly margined, paginated PDF documents.
HTML to PDF
Render raw HTML snippets or styled web documents into downloadable PDFs with preserved CSS typography and tables.
PDF to Markdown
Extract headings, paragraphs, lists, and tables from PDF documents into clean Markdown (.md) files for docs and wik
Markdown to PDF
Compile Markdown (.md) documentation, READMEs, and technical specs into clean, print-styled PDF deliverables.
CSV to PDF
Format comma-separated CSV datasets into neat, paginated PDF data tables ready for executive sharing and archiving.
XML to PDF
Render structured XML data records into readable, human-friendly PDF summary documents without manual XSLT setup.
Convert PDF to PDF/A
Convert standard PDFs into ISO-standardized PDF/A archival files with self-contained fonts for long-term legal rete
10 Adaptive Target-KB PDF & Batch Image Compression Tools
Strict government & job portal target KB compressors (100KB, 200KB, 500KB, 1MB) alongside multi-format batch image optimizers for JPG, PNG, WebP, and iPhone HEIC.
Compress PDF to 100KB
Use Seoffix Compress PDF to 100KB (compress pdf to 100kb) to process inputs instantly in your browser—100% free, pr
Compress PDF to 200KB
Use Seoffix Compress PDF to 200KB (compress pdf to 200kb) to process inputs instantly in your browser—100% free, pr
Compress PDF to 500KB
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Compress PDF to 1MB
Use Seoffix Compress PDF to 1MB (compress pdf to 1mb online) to process inputs instantly in your browser—100% free,
Compress PDF
Use Seoffix Compress PDF (compress pdf) to process inputs instantly in your browser—100% free, private, and no sign
Batch Image Compressor
Free online Batch Image Compressor by Seoffix Design Lab. Run fast, accurate batch image compressor checks in your
Compress JPG
Reduce JPEG photo byte size with smart chroma and quality tuning while avoiding blocky compression artifacts.
Compress PNG
Shrink PNG UI screenshots, icons, and transparent graphics cleanly while preserving sharp edges and alpha channels.
Compress WebP
Optimize modern WebP images to minimal byte sizes for fast mobile Core Web Vitals and responsive picture elements.
Convert HEIC Photo
Convert Apple iPhone HEIC/HEIF photos into widely compatible, compressed JPG or PNG files directly in your browser.
Why Webmasters, Developers & Agencies Use Seoffix Design Lab
Everyday website maintenance often forces teams across dozens of single-purpose tabs to inspect HTTP redirects, merge client PDFs, convert WebP images, or validate JSON schemas.
Seoffix Design Lab unifies more than 385 browser-based SEO diagnostics, document converters, developer formatters, calculators, and verified AI profiles inside one fast, account-free workspace.
236-Checkpoint Technical SEO Auditing
Run live origin checks across crawlability, canonical tags, Core Web Vitals signals, security headers, Open Graph cards, structured data, and AI search crawler rules (`robots.txt` and `llms.txt`) from a single URL scan.
Privacy-Conscious PDF & Media Processing
Merge, split, rotate, unlock, and convert PDF documents alongside lossless WebP/PNG resizing and EXIF cleanup without installing heavyweight desktop office suites or paying per-document fees.
Curated AI Directory & Prompt Engineering
Compare thousands of categorized AI software tools by real pricing model, practical trade-offs, and use case, then pair them with ready-to-adapt prompt templates for coding, research, and editorial workflows.
Frequently Asked Questions
Are the online tools on Seoffix free to use?
Yes. Core web utilities across SEO analysis, text processing, image editing, PDF conversion, code formatting, and unit calculation run directly in your browser without mandatory sign-up walls.
Does Seoffix offer a Windows desktop application?
Yes. Teams that prefer local desktop workflows can download Seoffix Desk for Windows 10/11 (64-bit) to run multi-tab site audits, PDF utilities, and offline developer tools natively.
How should I run a complete technical SEO check on a new domain?
Start with the Full SEO Site Auditor to inspect HTTP status codes, canonical tags, structured data, and AI crawler directives, then use the Redirect Checker, SSL Checker, and SERP Simulator to verify individual landing pages after deploying fixes.
Can I save my most-used utilities for daily access?
Yes. Click the star icon on any tool card to pin your favorite calculators, formatters, or SEO checkers locally in your browser, or use the instant search bar above to jump straight to any tool by keyword.