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Original
1 function greet(name) {'{'}
2   console.log("Hello, " + name);
3   return true;
4{'}'}
Modified
1 function greet(name, greeting) {'{'}
2   console.log(greeting + ", " + name);
3   return greeting;
4{'}'}
3 additions3 deletions
Word-level diff

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or

Supports: .txt, .md, .json, .csv, code files (max 10MB)

or load from URL

Drag & drop file here

or

Supports: .txt, .md, .json, .csv, code files (max 10MB)

or load from URL

Ready to Compare

Enter or paste text in both panels above to see the differences highlighted instantly

Quick Tips

  • Drag & drop files to compare instantly
  • Load text directly from URLs
  • Use keyboard shortcuts (press ? for help)
  • All processing happens in your browser - your data stays private

Free Online Text Comparison Tool - Compare Text Files Instantly

DiffText Pro is a powerful, free online text comparison tool that helps you quickly identify differences between two text files, documents, or code snippets. Whether you're a developer reviewing code changes, a writer comparing document versions, or a student checking edits, our intuitive diff checker makes it easy to see exactly what changed.

How to Use Our Text Diff Tool

Using DiffText Pro is simple and straightforward. Just paste your original text in the left panel and your modified text in the right panel. Our advanced diff algorithm instantly highlights the differences with color-coded changes: green for additions, red for deletions, and yellow for modifications. You can also upload files directly, adjust comparison settings to ignore whitespace or case differences, and export your results in multiple formats.

Why Choose DiffText Pro?

Unlike other text comparison tools, DiffText Pro prioritizes your privacy and provides a superior user experience. All text processing happens entirely in your browser - your data never leaves your device and is never sent to our servers. This means you can safely compare sensitive documents, source code, or confidential information without any privacy concerns. Plus, our tool is completely free with no sign-up required, no file size limits, and no usage restrictions.

Common Use Cases

For Developers: Compare code files before committing, review pull requests, analyze git diffs, check merge conflicts, and verify code refactoring changes. Our syntax highlighting supports 50+ programming languages including JavaScript, Python, Java, C++, and more.

For Writers & Editors: Track changes between document drafts, compare article revisions, check proofreading edits, and review contract modifications. Perfect for content creators, journalists, and technical writers who need to see exactly what changed between versions.

For Students & Educators: Compare essay drafts, check assignment revisions, analyze text differences in research papers, and review editing suggestions. Great for academic writing and collaborative projects.

For Legal & Business Professionals: Compare contract versions, review policy changes, analyze agreement modifications, and track document updates. Ideal for legal teams, compliance officers, and business analysts.

Advanced Features

Our text diff tool includes powerful features designed for professionals. Choose between word-level, character-level, or line-level comparison modes depending on your needs. Enable syntax highlighting for code files with automatic language detection. Ignore whitespace changes, case differences, or empty lines to focus on meaningful content changes. Export your comparison results as HTML, PDF, or JSON formats. Save your comparisons locally in your browser history for quick access later. Share comparisons with colleagues using secure URL encoding. When your workflow includes heavy Markdown documentation, explore MarkdownForge for streamlined formatting and publishing.

Privacy & Security

Your privacy is our top priority. DiffText Pro uses client-side processing, which means all diff calculations happen in your browser using JavaScript. No text data is uploaded to our servers, transmitted over the internet, or stored in any database. Your sensitive documents, source code, and confidential information remain completely private on your device. This architecture ensures maximum security and allows you to use the tool offline once the page is loaded.

Frequently Asked Questions

Is DiffText Pro really free?

Yes, DiffText Pro is completely free with unlimited comparisons, no file size limits, and no hidden fees. All features are available without requiring sign-up or payment.

What file formats do you support?

We support plain text (.txt), Markdown (.md), JSON (.json), CSV (.csv), and all common code file formats (.js, .py, .java, .html, .css, .xml, .yaml, and 50+ more).

Can I compare large files?

Yes, DiffText Pro can handle large files efficiently using optimized diff algorithms and virtual scrolling. While there's no hard limit, very large files (100MB+) may take longer to process depending on your device.

How does the share feature work?

When you click Share, your text comparison is encoded into a URL that you can share with others. Note that the text is included in the URL itself, so be cautious when sharing sensitive information.

Lightning Fast

Real-time comparison as you type with instant results

Privacy First

All processing happens in your browser. Your text never leaves your device.

Developer Friendly

Perfect for code reviews, git diffs, and text analysis

Privacy-First Design

All text comparison processing happens entirely in your browser. Your data never leaves your device and is never sent to our servers.

DiffText ProDiffText Pro

Professional text comparison tool for developers, writers, and editors. Compare text instantly with real-time diff highlighting.

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