How does text comparison work?

The diff tool analyzes two texts line by line and highlights differences: additions in green, deletions in red, and changes in yellow. Perfect for code review and document comparison.

Can I compare source code?

Yes, the diff tool works with any type of text including source code, documents, configurations, and more. It shows exact differences between two versions.

Is it free and private?

Yes, the diff tool is 100% free. All processing happens in your browser, your texts are never sent to any server.

Text Diff / Compare Tool

Original Text1 lines

Modified Text1 lines

Ignore whitespace

All comparison is done in your browser. No data is sent to any server.

Developer Tools

Useful paid options if you need support, advanced features, or heavier workflows than the free tool covers.

Top pick

JetBrains

JetBrains - Developer IDEs

Best for: professional IDEs with built-in diff, refactoring, and smart code completion for every language

Professional IDEs with built-in diff, refactoring, and smart code completion for every language.

Try JetBrains→

Best value

GitHub Copilot

GitHub Copilot - AI Pair Programmer

Best for: aI-powered code completion, chat, and pull request reviews

AI-powered code completion, chat, and pull request reviews. Write code faster with your AI pair programmer.

Try Copilot→

Strong alternative

VS Code

VS Code - Free Code Editor

Best for: free, open-source code editor with built-in Git diff, IntelliSense, and thousands of extensions

Free, open-source code editor with built-in Git diff, IntelliSense, and thousands of extensions.

Get VS Code→

Also consider

DigitalOcean

DigitalOcean - Simple Cloud Hosting

Best for: deploy apps, databases, and APIs in seconds

Deploy apps, databases, and APIs in seconds. Starting at $4/month. Developer-friendly platform.

Get Started→

Also consider

Hostinger

Hostinger - Affordable Web Hosting

Best for: premium hosting from $2

Premium hosting from $2.99/month. Free domain, SSL, and email. 99.9% uptime guarantee.

Get Hostinger→

We may earn a commission through affiliate links at no extra cost to you.

Recommendations are chosen for fit with the use case; not every recommendation depends on an affiliate relationship.

Free Online Text Diff & Compare Tool

Compare two texts side by side with color-coded differences. Find additions, deletions, and changes instantly. Perfect for code review, legal document comparison, version control, and translation verification.

How Diff Comparison Works

Our comparator uses the Longest Common Subsequence (LCS) algorithm to precisely identify differences between two texts. It supports line-by-line and word-by-word comparison. Additions are highlighted in green, deletions in red, and modifications are clearly marked for quick, error-free identification.

Common Use Cases

Code review: compare old and new versions of your code before committing. Legal documents: verify changes between contract versions. Translations: compare original text with translation to detect omissions. SEO: compare meta descriptions or content between page versions.

Privacy Guaranteed

All processing happens in your browser using pure JavaScript. The texts you compare are never sent to any server, ensuring total confidentiality for your sensitive documents.

Learn more with related in-depth guides and tutorials.

code review8 min

Text Comparison for Code Review: Best Practices

Learn how to use diff tools effectively for code review — reading diffs, reviewing PRs, giving feedback, and integrating comparison into your workflow.

diff7 min

Text Diff Guide: How to Compare Documents & Code

Learn how text diff works, when to use it for code review and document comparison, and how to interpret additions and removals in our free diff tool.

🔍Text Diff / Compare Tool