Universal SEO, PDF & AI Utilities.
Fast, Free & Privacy-First.
Instant search engine optimization tools, Linux-powered PDF converters, LLaMA AI content writers, and high-speed media utilities.
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38 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.
Article Rewriter
1
Plagiarism Checker
2
Word Counter
11
Online Md5 Generator
39
Paraphraser Tool Lite
101
Content Rewriter Pro
101
Change Text Case
101
Grammar Checker
101
Remove Duplicate Lines
101
Line Counter
101
Lorem Ipsum Generator
101
Duplicate Content Detector
101
Reverse Text Generator
101
Small Text Generator
101
Text Compare
101
Upside Down Text Generator
101
Word Counter Pro
101
Article Scraper
100
Comma Separating Tool
101
Code Difference Comparison Tool
101
Add Line Numbers to Text
101
Fancy Font & Text Style Generator
50
Zalgo & Glitch Text Generator
51
Bubble & Circled Text Generator
52
NATO Phonetic Alphabet Speller
53
Braille Code & Unicode Translator
54
Readability Score & Grade Calculator
55
English to Gen-Z Slang Converter
56
Whitespace & Line Break Cleaner
57
Invisible Text & Zero-Width Steganography Studio
120
Online Line Break Remover & Paragraph Cleaner
121
ASCII Art Text Banner Generator
131
Leetspeak (1337 5P34K) Text Generator
132
Agency White-Label Audit
377
Proposal Deliverables Builder
378
Lead Magnet Scorecard
380
Article Density Checker
101
Random Word Generator
101
65 High-Performance Online PDF Tools
Smallpdf & iLovePDF power built directly into Seoffix. Convert, merge, split, compress, protect, unlock, sign, edit, and crop your documents with 100% data privacy and zero file size limits.
Merge PDF
1
Split PDF
1
Rotate PDF
1
Delete PDF Pages
1
Reorder PDF Pages
1
Extract PDF Pages
1
JPG to PDF
1
PNG to PDF
1
PDF to JPG
1
PDF to PNG
1
Compress PDF
1
Protect PDF
1
Unlock PDF
1
Watermark PDF
1
Add Page Numbers
1
Grayscale PDF
1
Repair PDF
1
Flatten PDF
1
Word to PDF
1
Excel to PDF
1
PowerPoint to PDF
1
PDF to Word Converter (Convert PDF to Word Online Free)
1
PDF to Text
1
Sign PDF (eSign)
1
Edit PDF (Annotations)
1
Crop PDF
1
Compress PDF to 100KB
319
Compress PDF to 200KB
320
Compress PDF to 500KB
321
Compress PDF to 1MB
322
Universal Document Converter
328
ODT to PDF
329
ODS to PDF
330
ODP to PDF
331
PDF to ODT
332
PDF to ODS
333
EPUB to PDF
334
MOBI to PDF
335
AZW3 to PDF
336
DJVU to PDF
337
PDF to EPUB
338
PDF to MOBI
339
RTF to PDF
340
Text to PDF
341
HTML to PDF
342
PDF to Markdown
343
Markdown to PDF
344
CSV to PDF
345
XML to PDF
346
Remove PDF Metadata
355
Sanitize PDF
356
Compare PDF Text
357
Verify PDF Signatures
358
Booklet Page Creator
359
Pages Per Sheet (N-Up)
360
Halve PDF Pages
361
Change PDF Page Size
362
PDF Bleed Box Sizer
363
Forensic Redact PDF
364
Convert PDF to PDF/A
365
PDF Form Filler
366
Local OCR Engine
367
Document Passage Search
368
PDF Extractive Summarizer
369
Document Excerpt Extractor
370
7 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 Position Checker
6
Keyword Density Checker
16
Keywords Suggestion Tool
48
Keyword Suggestion Tool v2
101
Keywords Rich Domains Suggestions Tool
101
Long Tail Keyword Suggestion
101
Questions Explorer Tool
101
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
3
Backlink Checker
9
Link Analyzer
13
Algorithmic Site Value & Traffic Appraisal Calculator
32
Website Links Count Checker
37
Broken Links Finder
46
Link Tracker
101
Long to Short Link Converter
101
Moz Backlink Extractor
101
Youtube Backlinks Generator
101
Bulk URL Shortener
100
36 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.
Robots.txt Generator
7
XML Sitemap Generator
8
Online Ping Website Tool
12
URL Rewriting Tool
22
URL Encoder / Decoder
25
Webpage Screen Resolution Simulator
27
Page Size Checker
28
Suspicious Domain Checker
31
Website Screenshot Generator
33
Get Source Code of Webpage
35
Page Speed Checker
40
Email Privacy
44
Get HTTP Headers
101
Mobile Friendly Test
101
Check GZIP compression
101
All-In-One Full Comprehensive SEO Site Auditor
101
Pagespeed Insights Checker
51
Network Speed Tester
101
Open Graph Checker
101
Open Graph Generator
101
Twitter Card Generator
101
Schema Markup Generator
101
Universal CMS, Script & Theme Detector
101
Online Traceroute Tool
101
Security Headers Auditor
1
Subdomain Finder
1
Redirect Chain & Header Tracer
Free online redirect chain & header tracer utility for webmasters, developers, and digital creators.
Schema Markup & JSON-LD Generator
95
Social Media & Open Graph Card Previewer
96
Robots.txt Tester & Crawler Validator
97
Multi-Language Hreflang Tag Generator
98
XML Sitemap Syntax Validator & Auditor
99
Email Header Decoder & Route Analyzer
122
HTTP Methods & Allowed Verbs Auditor
124
Enterprise Multi-Threat Security & Malware Scanner
126
PWA Compatibility & Installability Auditor
127
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
15
Google Malware Checker
17
Enterprise DNS, WHOIS & Network Forensics Inspector
19
Domain into IP
20
www Redirect Checker
23
Mozrank Checker
24
Server Status Checker
26
Google Index Checker
36
Class C Ip Checker
38
Code to Text Ratio Checker
41
What is my Browser
43
Google Cache Checker
45
Search Engine Spider Simulator
47
Domain Authority Checker
49
Page Authority Checker
50
Universal Social Signal Counter & Engagement Tracker
101
Apps Rank Tracking Tool
101
Twitter Graph Checker
101
Is Your Website Down Right Now
101
Website Hit Counter
101
Browser Fingerprint & Tracking Auditor
123
UTM Campaign Builder
382
12 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.
Free Proxy List
101
CSR Generation
101
CSR Decoder
101
Certificate Decoder
101
Certificate Key Matcher
101
Check CSR
101
SSL Converter
101
SSL Checker
101
Password Strength Checker
101
Password Encryption Utility
101
Password Generator
101
Disavow File Generator
101
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
18
Blacklist Lookup
30
Domain Hosting Checker
34
Find DNS records
42
Bulk Domain Availability Checker
101
Bulk Domain Age Checker
101
Blog Finder
101
Bulk Facebook ID Finder
101
Global DNS Propagation Checker
Free online global dns propagation checker utility for webmasters, developers, and digital creators.
ASN & BGP Route Lookup Tool
125
29 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 Crop Tool
101
Image Pencil Effect
101
Image to Base64
101
Image Optimizer
101
Image Resizer
101
Reverse Image Search & Photo Finder (Image Search Techniques)
101
Favicon Generator Tool
101
Base64 to Image
101
Text to Image
101
Rotate Image Online
101
WASM Audio Converter
1
WebP & Image Format Converter
1
Browser Screen & Mic Recorder
1
Video to GIF Maker
1
Video to MP3 Extractor
1
Interactive Meme Generator
1
QR Code Scanner & Reader
1
Image EXIF & Metadata Privacy Stripper
100
Image Privacy Blur & Pixelate Censor
101
Visual Audio Trimmer & Ringtone Cutter
102
Audio Volume Booster & Sound Amplifier
103
Vector SVG to High-Resolution PNG & JPG Converter
104
Interactive Color Wheel & Harmony Studio
130
Batch Image Compressor
323
Compress JPG
324
Compress PNG
325
Compress WebP
326
Convert HEIC Photo
327
YouTube Thumbnail Downloader
1
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
101
Age Calculator
101
Average Calculator
101
Binary Calculator & Bitwise Logic Engine
101
Binary to Text
101
Binary Translator
101
Bitcoin Price Calculator
101
Credit Card Generator
101
Credit Card Validator
101
HTML Compressor
101
JS Minifier
101
CSS Minifier
101
CSV to JSON
101
Currency Converter
101
Decimal to ASCII
101
Diff Checker
101
Bulk Email Validator
101
Fake Address Generator
101
Hex Calculator
101
HTML Encoder
101
HTML Decoder
101
Numbers to Words Converter
101
Readability Checker
101
Roman Numerals Date Converter
101
Text to Binary
101
Text To Speech Converter
101
Urdu Typing Tool
101
Word Combiner
101
XML to JSON
101
Aim Trainer & Reflex Benchmark
Free online aim trainer & reflex benchmark utility for webmasters, developers, and digital creators.
Virtual 3D Coin Flipper
Free online virtual 3d coin flipper utility for webmasters, developers, and digital creators.
3D Virtual Dice Roller
Free online 3d virtual dice roller utility for webmasters, developers, and digital creators.
Online Precision Stopwatch
Free online online precision stopwatch utility for webmasters, developers, and digital creators.
Online Countdown Timer with Alarm
Free online online countdown timer with alarm utility for webmasters, developers, and digital creators.
Zodiac Sign & Astrology Calculator
Free online zodiac sign & astrology calculator utility for webmasters, developers, and digital creators.
Morse Code & Audio Translator
49
Audio Tone & Frequency Generator
84
BPM Counter & Tap Tempo
85
Online Voice & Audio Recorder
86
Audio Pitch & Playback Speed Shifter
87
Morse Code Audio Player & Synthesizer
88
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
1
Compound Profit & Interest Calculator
1
World Clock & Timezone Comparator
1
BMI & Health Matrix Calculator
1
Calorie & Macro Calculator
1
Sales Tax / GST / VAT Calculator
1
Between Dates & Duration Calculator
1
GPA & College Grade Calculator
1
Percentage & Discount Calculator
1
Pet Real Age Calculator
1
Electricity Bill & Appliance Cost Calculator
1
Scientific Calculator Online
65
Ohm's Law & Power Calculator
66
Tip Calculator & Bill Splitter
67
Standard Deviation & Variance Calculator
69
Salary & Take-Home Pay Estimator
89
Inflation Impact & Purchasing Power Calculator
90
Crypto & Stock Profit / ROI Calculator
91
Auto & Car Loan Payment Calculator
92
Savings Goal & Target Wealth Calculator
93
Discount, Sale Price & Savings Calculator
94
Time Duration & Date Interval Calculator
128
Create Electronic Invoice
347
Validate E-Invoice
348
Attach Invoice XML
349
GST Calculator
350
HSN & SAC Lookup
351
Rupees in Words
352
MSME 45-Day Payment Date
353
Proforma Invoice Generator
354
Break-Even ROAS Calculator
371
Cart Recovery ROI Engine
372
Price & Margin Engine
373
Customer Lifetime Value (CLV)
374
CAC Payback Period
375
E-Commerce SKU Generator
376
Retainer ROI Model
379
Aspect Ratio Calculator
1
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
1
Weight & Mass Converter
1
Length & Distance Converter
1
Digital Storage Converter
1
Fuel Consumption Converter & Trip Cost
68
Area Converter - Land & Metric Area Calculator
70
Volume & Liquid Capacity Converter
71
Speed & Velocity Converter
72
Pressure Units Converter
73
Power & Mechanical Work Converter
74
Energy & Heat Converter
75
Data Transfer Rate & Bandwidth Converter
76
Angle Converter - Degrees, Radians & Arcseconds
110
Force Units Converter - Newtons, lbf & Dynes
111
Torque Converter - N·m, Foot-Pounds & Inch-Pounds
112
Density Converter - kg/m³, g/cm³, lb/ft³ & lb/in³
113
Illuminance Converter - Lux (lx) & Foot-Candles (fc)
114
Flow Rate Converter - LPM, GPM, m³/h & CFM
115
Running Pace & Speed Converter
129
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
1
Cron Job Schedule Generator
1
Fake Identity & Persona Generator
1
WebRTC & Browser Privacy Leak Tester
Free online webrtc & browser privacy leak tester utility for webmasters, developers, and digital creators.
JWT Decoder & Token Debugger (Decode JWT Online)
Free online jwt decoder & token debugger (decode jwt online) utility for webmasters, developers, and digital creators.
SQL Query Beautifier & Formatter
Free online sql query beautifier & formatter utility for webmasters, developers, and digital creators.
JSON to YAML Converter
Free online json to yaml converter utility for webmasters, developers, and digital creators.
YAML to JSON Converter
Free online yaml to json converter utility for webmasters, developers, and digital creators.
Bcrypt Hash Generator & Verifier
Free online bcrypt hash generator & verifier utility for webmasters, developers, and digital creators.
UUID v4 & Secret Key Generator
Free online uuid v4 & secret key generator utility for webmasters, developers, and digital creators.
HTML to Markdown Converter
Free online html to markdown converter utility for webmasters, developers, and digital creators.
Apache .htaccess to Nginx Converter
58
Nginx to Apache .htaccess Converter
59
Content Security Policy (CSP) Builder
60
Security.txt RFC 9116 Generator
61
IP Subnet & CIDR Calculator
63
CVE Vulnerability & Exploit Search
64
Binary Calculator & Bitwise Logic Engine
101
HTML Formatter & Beautifier
77
HTML Minifier & Code Compressor
78
CSS Formatter & Stylesheet Beautifier
79
JavaScript Formatter & Code Beautifier
80
HTML Entity Encoder
81
HTML Entity Decoder
82
Code Syntax Highlighter & Exporter
83
CSV to TSV Tab-Delimited Converter
105
TSV to CSV Comma-Separated Converter
106
JSON to CSV Spreadsheet Converter
107
List Randomizer & Item Shuffler (Randomise a List Online)
108
Interactive Markdown Table Generator
109
AES-256 Encryption & Decryption Studio
116
Punycode & IDN International Domain Converter
117
High-Speed HMAC Hash Generator
118
Base58 (Bitcoin & IPFS) Encoder & Decoder
119
WhatsApp Direct Chat Link
381
QR Code Studio
383
Bio Link Page Generator
384
JSON & XML Studio
385
Regex Studio & Tester
386
SHA-256 & SHA-512 Hash Studio
387
Open Port Checker
1
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
328
ODT to PDF
329
ODS to PDF
330
ODP to PDF
331
PDF to ODT
332
PDF to ODS
333
EPUB to PDF
334
MOBI to PDF
335
AZW3 to PDF
336
DJVU to PDF
337
PDF to EPUB
338
PDF to MOBI
339
RTF to PDF
340
Text to PDF
341
HTML to PDF
342
PDF to Markdown
343
Markdown to PDF
344
CSV to PDF
345
XML to PDF
346
Convert PDF to PDF/A
365
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
319
Compress PDF to 200KB
320
Compress PDF to 500KB
321
Compress PDF to 1MB
322
Compress PDF
1
Batch Image Compressor
323
Compress JPG
324
Compress PNG
325
Compress WebP
326
Convert HEIC Photo
327
Why Webmasters, Developers & Agencies Use Seoffix Design Lab
Everyday website maintenance usually forces teams to bounce across dozens of single-purpose tabs—one site to inspect HTTP redirects and schema markup, another to merge or compress client PDFs, a third to convert WebP images, and a fourth to validate JSON payloads or unit formulas. Seoffix Design Lab brings more than 377 browser-based SEO diagnostics, document converters, developer formatters, calculators, and curated AI directory profiles together in 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.