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Audio Tools
- Format Converter
- Trimmer/Cutter
- Merge Files
- Extract Audio from Video
- Change Volume
- Speed Changer
- Pitch Shifter
- Audio Reverser
- Silence Remover
- Audio Compressor
- Fade In / Fade Out
- Metadata (ID3) Editor
- BPM Detector
- Stereo to Mono
- Audio Splitter
- Noise Reducer
- Text-to-Speech
- Speech-to-Text
- Waveform Generator
- Ringtone Maker
- Audio Normalizer
- Video Tools
- Document Tools
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Web Tools
- Webpage Screenshot
- Broken Link Checker
- SEO Meta Tag Extractor
- Website Uptime Monitor
- Page-Speed Analyzer
- Robots.txt Generator
- Sitemap Generator
- RSS/Atom Feed Validator
- Webpage to PDF
- HTML/CSS/JS Playground
- DNS Lookup
- WHOIS Lookup
- HTTP Headers Inspector
- SSL Certificate Checker
- IP Geolocation
- URL Shortener
- HTTP Status Checker
- URL Word Count
- Cookie Viewer
- HTML Diff Checker
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Data Generators
- Fake User Data Generator
- Dummy File Generator
- Sample CSV Generator
- Sample JSON Generator
- Test Credit Card Number Generator
- SQL Insert Statement Generator
- Placeholder Image Generator
- Barcode Generator
- Dummy Log File Generator
- Mock API Response Generator
- Color Palette Generator
- Test Data Permutation Generator
- Country & City Data Generator
- XML Data Generator
- Robots.txt Generator
- Sitemap.xml Generator
- Random Data Distribution Generator
- Time Series Data Generator
- Test Email Address Generator
- Markdown Sample Generator
- CSV Tools
- List Tools
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PDF Tools
- Merge PDFs
- Rotate PDF
- Extract Metadata
- Text Extract
- PDF to DOCX
- Split PDF
- Reorder Pages
- Crop PDF
- Transform PDF
- Extract Images
- PDF to JPG
- PDF to PNG
- PDF to GIF
- PDF to TIFF
- PDF to SVG
- PDF to WebP
- PDF to AVIF
- PDF to BMP
- PDF to ICO
- JPG to PDF
- PNG to PDF
- HEIC to PDF
- GIF to PDF
- TIFF to PDF
- SVG to PDF
- WebP to PDF
- AVIF to PDF
- BMP to PDF
- ICO to PDF
- DOCX to PDF
- Compress Scanned PDF
- Compress PDF
- Remove PDF Password
- Set PDF Password
- Fill PDF Form
- Watermark PDF
- Sign PDF
- Delete PDF Pages
- Advanced
- OCR to Searchable PDF
- Redaction
- Annotate / Comment
- Page Numbers / Headers / Footers
- PDF Compare
- Table Extractor
- Flatten Forms
- Bates Numbering
- Page Resize / Reflow
- PDF/A Converter
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Image Tools
- BMP to JPG/PNG
- TIFF to JPG/PNG
- TIF to JPG/PNG
- WEBP to JPG/PNG
- PNG to JPG/PNG
- JPG to JPG/PNG
- JPEG to JPG/PNG
- GIF to JPG/PNG
- ICO to JPG/PNG
- HEIC to JPG/PNG
- RAW Images to JPG/PNG
- Smart Tools
- Background Remover
- EXIF Viewer/Stripper
- Watermark Adder
- Favicon Generator
- Sprite Sheet Generator
- Batch Thumbnails
- Color Palette Extractor
- GIF Maker
- Target-Size Compressor
- Compress Images
- Compress BMP
- Compress TIFF
- Compress TIF
- Compress WEBP
- Compress PNG
- Compress JPG
- Compress JPEG
- Compress GIF (animated supported)
- Compress ICO
- Compress HEIC
- Compress RAW Images
- Transform Images
- Transform BMP
- Transform TIFF
- Transform TIF
- Transform WEBP
- Transform PNG
- Transform JPG
- Transform JPEG
- Transform GIF (animated supported)
- Transform ICO
- Transform HEIC
- Transform RAW Images
- Crop Images
- Crop BMP
- Crop TIFF
- Crop TIF
- Crop WEBP
- Crop PNG
- Crop JPG
- Crop JPEG
- Crop GIF
- Crop ICO
- Crop HEIC
- Crop RAW Images
- Resize Images
- Resize BMP
- Resize TIFF
- Resize TIF
- Resize WEBP
- Resize PNG
- Resize JPG
- Resize JPEG
- Resize GIF (animated supported)
- Resize ICO
- Resize HEIC
- Resize RAW Images
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Utility Tools
- Base64 Encode/Decode
- URL Encode/Decode
- UUID Generator
- Unit Converter
- Currency Converter
- Timezone Converter
- IP/DNS Toolkit
- Percentage Calculator
- BMR/TDEE Calculator
- Mortgage/Affordability
- Pace/Speed Converter
- File Size/Time Estimator
- Color Picker/Contrast
- Calculators
- Age Calculator
- Birthday Countdown
- BMI Calculator
- EMI Calculator
- Loan Calculator
- Discount Calculator
- Tip Calculator
- Time
- Stopwatch
- Timer
- Date Difference
- Time Between Dates
- Seconds to Time
- Time to Seconds
- Truncate Clock Time
- Days to Hours
- Hours to Days
- Misc
- Epoch Converter
- Unix to Date
- Leap Year Check
- Crontab Guru
- Random Number Generator
- QR Code Generator
- Screen Resolution
- Internet Speed Test
- Date Converter
-
Text Tools
- Case Converter
- Case Styles Converter
- Word & Char Counter
- Remove Duplicate Lines
- Sort Lines
- Reverse Text
- Slugify
- Text Diff Checker
- Lorem Ipsum Generator
- Spell Checker
- Remove Line Breaks
- Word Combiner
- Uppercase ⇄ Lowercase
- Number to Words
- Words to Number
- Roman Numerals Converter
- Remove Spaces
- Random String Generator
- Invisible Character
- Split Text
- Join Text
- String to Morse
- Text Replacer
- Regex Find/Replace
- Repeat Text
- Truncate Text
- Randomize Case
- Extract Substring
- Create Palindrome
- Palindrome Check
- Text Quoter
- Rotate Text
- ROT13
- Base64 Encoder/Decoder
- Extract Emails/URLs/Phones
- Diacritics Remover
- Unicode Normalizer
- Wrap / Unwrap
- Markdown Table Generator
- Word Frequency
- Text Statistics
- Text Censor
- Password Generator
- URL Encoder
- URL Decoder
- Hidden Character Detector
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Dev Tools
- JSON Formatter
- Validate JSON
- Prettify JSON
- Minify JSON
- Stringify JSON
- JSON to XML
- Escape JSON
- TSV to JSON
- CSV to JSON
- Compare JSON
- Regex Tester
- XML Beautifier
- XML Validator
- JWT Decoder
- JWT Builder/Verifier
- Password Strength
- PHP Formatter
- CSS Minifier/Beautifier
- HTML Minifier
- JS Minifier/Beautifier
- Batch Minifier (ZIP)
- UUID/ULID Generator
- YAML ↔ JSON/TOML
- cURL/HTTP Builder
- .env Linter
- Color Converter
- Markdown ↔ HTML
- JSON Diff/Merge
- Python/SQL Formatter
- Certificate Decoder
- Base64 Tool
- File to Base64
- File Hash Generator
- Morse Code
- User-Agent Parser
Compare HTML side by side
Upload two HTML files and review the highlighted differences in a clean split view.
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Upload two HTML files to view their differences.
What is HTML Diff Checker?
HTML Diff Checker is a free web diagnostic from WizardOfAZ. Use it to check HTML markup for common problems as part of your auditing and monitoring, without installing extra software.
Because everything happens locally in your browser, your site data stay under your control while you check HTML markup for common problems.
Popular ways to use HTML Diff Checker
- Streamline auditing and monitoring by using HTML Diff Checker to check HTML markup for common problems.
- Share deliverables faster—processed web resources are ready for download in seconds.
- Combine HTML Diff Checker with other WizardOfAZ tools to keep complex workflows in one browser tab.
Examples and workflow tips
- Upload a sample file, cast the spell to check HTML markup for common problems, and download the processed result instantly.
- Bookmark the HTML Diff Checker in your browser so recurring tasks stay only one click away.
- Share the spell with teammates who need a quick, no-install way to check HTML markup for common problems.
Frequently asked questions
Is the HTML Diff Checker secure?
Yes. The HTML Diff Checker runs entirely in your browser, which means your site data never leave your device.
What can I do with the HTML Diff Checker?
You can auditing and monitoring by processing web resources without uploading them to an external service.
Can I use HTML Diff Checker on mobile?
Yes. WizardOfAZ tools are responsive, so you can launch the spell on desktops, tablets, or phones without installing extra apps.
Related tools to explore
Expand your toolkit with other WizardOfAZ spells that complement HTML Diff Checker:
- Broken Link Checker — Use it to check web resources for common problems.
- Cookie Viewer — Use it to work with web resources using flexible options.
- DNS Lookup — Use it to work with web resources using flexible options.