Online Diff Tool

Compare two texts or code snippets to instantly see differences highlighted with clear visual formatting.

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7,188+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

This online diff tool allows you to compare two text inputs or code snippets and visually see the differences highlighted. The tool performs a line-by-line comparison using an efficient diff algorithm, showing additions, deletions, and unchanged content with color-coded formatting. You can choose between side-by-side view or unified diff output, making it perfect for comparing code versions, document revisions, or any text-based content. The tool works entirely in your browser with no data sent to servers, ensuring privacy and instant results.

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How to Use

Enter or paste your original text in the 'Original Text' textarea\n
Enter or paste your modified text in the 'Modified Text' textarea\n
Select your preferred diff view: 'Side-by-side' or 'Unified'\n
Choose whether to ignore whitespace differences\n
Click the 'Compare Texts' button to generate the diff\n
View the results showing added lines in green, removed lines in red, and unchanged lines in default color\n
Use the 'Clear All' button to reset both text areas and start over

Frequently Asked Questions

Find Quick Answers

What algorithm does this diff tool use?

The tool uses a modified Myers diff algorithm implemented in JavaScript, which efficiently finds the longest common subsequence between two texts for accurate difference detection.

Does the tool send my data to any server?

No, all processing happens entirely in your browser using JavaScript. Your text never leaves your device, ensuring complete privacy.

Can I compare code files with this tool?

Yes, the tool works perfectly for comparing code snippets in any programming language. The line-by-line diff makes it easy to see exactly what changed between two versions.

What's the difference between side-by-side and unified view?

Side-by-side view shows the original and modified texts in two columns with differences highlighted. Unified view shows a single output with + and - markers indicating additions and deletions.

Is there a limit to how much text I can compare?

There's no hard limit, but very large texts (over 10,000 lines) may slow down the browser. For best performance, compare texts under 5,000 lines each.

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