Free Online Text Diff Checker

Compare two texts instantly and highlight the differences between them

Compare two texts and highlight the differences between them. This tool processes your text directly in your browser - no data is sent to our servers. Perfect for comparing documents, code, translations, and any text-based content.

Original Text

Modified Text

How to Use the Text Diff Checker - Step by Step Guide

  1. Paste Your Original Text
    Copy and paste your original text into the first text area labeled "Original Text". This can be any text content including documents, code, emails, or articles.
  2. Add Your Modified Text
    Paste the modified or updated version of your text into the second text area labeled "Modified Text".
  3. Configure Comparison Options
    Adjust the comparison settings based on your needs:
    • Ignore case: Treats "Hello" and "hello" as identical
    • Ignore whitespace: Ignores spaces, tabs, and line breaks
    • Trim lines: Removes leading and trailing spaces from each line
  4. Select View Mode
    Choose how you want to see the comparison results:
    • Inline View: Shows all changes in a unified view with color-coded additions (green) and deletions (red)
    • Side by Side: Displays original and modified texts in parallel columns for easy comparison
  5. Compare and Analyze
    Click the "Compare Texts" button to generate the diff. The tool will highlight all differences and show statistics about added, removed, and modified lines.
  6. Copy or Share Results
    Use the "Copy Result" button to copy the formatted comparison to your clipboard for sharing or documentation purposes.

💡 Pro Tips

  • Use "Ignore case" when comparing texts where capitalization doesn't matter
  • Enable "Ignore whitespace" for code comparison to focus on content changes
  • Side-by-side view is better for longer documents
  • Inline view is perfect for quick change reviews

Common Use Cases & Applications

Software Development & Code Review

Perfect for developers to compare different versions of code, review pull requests, and track changes in source files.

Examples: Comparing JavaScript functions, reviewing HTML changes, analyzing CSS modifications

Document Editing & Proofreading

Track changes in documents, essays, articles, or any written content during the editing and revision process.

Examples: Academic papers, blog posts, legal documents, business proposals

Translation & Localization

Compare original and translated texts to ensure accuracy, completeness, and consistency in multilingual content.

Examples: Website translations, software localization, document translation verification

Version Control & Change Tracking

Monitor changes between different versions of any text-based content over time for better version management.

Examples: Policy updates, contract revisions, content management, backup comparisons

Academic & Research Work

Compare research drafts, analyze text variations, and track changes in academic writing and research papers.

Examples: Thesis revisions, research paper drafts, citation comparisons, literature analysis

Business & Legal Documents

Review contract changes, compare policy versions, and track modifications in important business documents.

Examples: Contract negotiations, policy updates, terms of service changes, compliance documents

Frequently Asked Questions

Yes, your data is completely secure. This tool processes all text directly in your browser. No data is sent to our servers or stored anywhere. Once you close or refresh the page, all data is cleared.

The tool can handle texts of moderate size (up to several thousand lines), but performance may decrease with very large texts. For extremely large files, we recommend splitting them into smaller chunks or using a desktop application designed for large file comparison.

This basic version doesn't include syntax highlighting for specific programming languages. However, it still effectively shows the differences between code snippets. For language-specific syntax highlighting, you might want to use a specialized code diff tool.

When "Ignore whitespace" is selected, the tool will ignore differences in spaces, tabs, and line breaks when comparing texts. This is useful when you want to focus on content changes rather than formatting changes. For example, "Hello World" and "Hello World" would be considered identical with this option enabled.

Absolutely! This text diff checker is excellent for comparing code files. It works with any programming language including JavaScript, Python, HTML, CSS, Java, C++, and more. The monospace font display and line-by-line comparison make it perfect for code review and debugging.

Inline view shows all changes in a single column with additions highlighted in green and deletions in red. It's compact and great for quick reviews. Side-by-side view displays the original and modified texts in parallel columns, making it easier to see the context and compare longer documents line by line.

No installation required! This is a web-based tool that runs entirely in your browser. It works on any device with a modern web browser including Windows, Mac, Linux, Android, and iOS. Just open the page and start comparing texts immediately.

Yes! You can use the "Copy Result" button to copy the formatted comparison to your clipboard. From there, you can paste it into any text editor, email, document, or save it as a file. The copied text includes all the diff markings (+ for additions, - for deletions) in a readable format.

Related Tools

Word Counter

Count words, characters, and lines in your text

Use Tool

Text Case Converter

Convert text to uppercase, lowercase, or title case

Use Tool

Character Counter

Count characters, words, and lines in your text

Use Tool

Base64 Encoder/Decoder

Encode and decode Base64 text data

Use Tool

HTML to Markdown

Convert HTML content to Markdown format

Use Tool

CSS Minifier

Minify and compress CSS code

Use Tool

What Our Users Say

"This text diff checker saved me hours of work when comparing different versions of my documents. The side-by-side view is incredibly helpful!"

Sarah M., Technical Writer

"Perfect for code reviews! I use this tool daily to compare different versions of my code. The ignore whitespace option is a game-changer."

Mike R., Software Developer

"As a student, this tool helps me track changes in my essays and research papers. It's free, fast, and works perfectly in my browser."

Emma L., University Student

"Excellent tool for comparing translations. The ability to ignore case differences makes it perfect for multilingual content comparison."

Carlos D., Translator

Join over 50,000+ users who trust our text comparison tool

Why Choose Our Text Diff Checker?

100% Secure & Private

All text processing happens in your browser. No data is sent to our servers or stored anywhere.

Lightning Fast

Instant text comparison with real-time highlighting of differences and changes.

Mobile Friendly

Works perfectly on all devices - desktop, tablet, and mobile phones.

Advanced Options

Customize comparison with options to ignore case, whitespace, and line trimming.

Ready to Compare Your Texts?

Start using our free text diff checker now - no registration required!

Start Comparing Explore More Tools
100% Free • Secure • Fast • Mobile Friendly