Diff Checker
Original
Modified
Local & SecureAll comparisons are local and private.
Fast & ReliableInstant, real-time results.
Mobile & Desktop OptimizedWorks on every device.
SEO EnhancedSearch-engine ready.
Accessibility ReadyKeyboard and ARIA friendly.
Comprehensive HelpAll documentation handy.
About This Diff Checker
Diff Checker is an advanced online solution for comparing any text, JSON, or XML document. With support for both side-by-side and structured tree views, the app gives you clear, visual highlights of every difference—whether you're reviewing code, validating config files, or comparing data. Designed from day one for privacy, nothing is ever uploaded or stored. The instant-edit panels handle huge files without lag, while auto-highlighting, search, collapsible sections, and deep feature cards make the experience fast and intuitive. SEO, accessibility, and mobile-first design guarantee easy discovery and perfect usability everywhere. Free and powerful, Diff Checker is the trusted choice for developers, tech writers, and business users who need clarity, confidence, and total control.
Frequently Asked Questions
What is a Diff Checker?
A Diff Checker compares two files or texts and highlights their differences for easy review.
Can I compare JSON and XML?
Yes, you can compare plain text, JSON, and XML documents, with side-by-side and tree diff views.
Is my data private?
Absolutely—everything runs in your browser, no data is uploaded or logged. Your files are 100% confidential.
Does it support large files?
Yes, the tool efficiently processes and compares very large documents.
Can I export or download my results?
Download the full diff report or export as TXT, JSON, or YAML.
Is it mobile friendly?
The entire UI is responsive and optimized for all devices.
Can I collapse/expand tree nodes?
Yes: JSON/XML tree views support full expand/collapse for deep comparison.
Does it have syntax highlighting?
Syntax highlighting is included for all formats and diff outputs.
How do I upload or paste files?
Paste text, upload files, or type directly—instant preview updates as you edit.
Is there a search in diff?
Yes: search, case sensitivity, regex, and match navigator for fast location.
Can I compare code?
You can compare code, config files, and documents of any type including JSON/XML.
Are updates planned?
The tool is updated regularly with new features and optimizations.
Does it highlight whitespace differences?
Yes. Toggle to show/hide whitespace and formatting changes.
Is it accessible?
Keyboard navigation, screen-reader support, ARIA labels ensure accessibility.
Are there hidden costs?
No. The Diff Checker is free, privacy-focused, and open to all users.
Can I report bugs or get help?
Yes. Use the Contact/Help link below to reach support.
Is my data ever stored?
No. Nothing leaves your device or is stored anywhere—total privacy.
Can I edit text and diff instantly?
Inline editing and instant diff refresh as you type.
What browsers are supported?
Chrome, Edge, Firefox, Safari—optimized for all common platforms.
What makes this better than competitors?
Depth, speed, privacy, accessibility, and SEO—all in one simple tool.

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