How to Use

How to Use the Text Diff Checker

Step 1: Paste Your Texts

Paste the original text in the left box and the modified text in the right box. Or use the sample button to see how diff works with example text.

Step 2: Compare

Click Compare Texts to see the differences between the two versions. Added lines appear in green, removed lines in red, and unchanged lines remain neutral.

Step 3: Review Changes

Scroll through the diff output to review every change. Use the Swap button to reverse which text is considered original vs modified.

Key Features

Instant line-by-line diff comparison
Color-coded additions and deletions
One-click swap of texts
Sample text for quick demo
100% browser-based, no data upload
Works offline after page load

Common Uses

Compare code versions and patches
Review document revisions
Check edited text for changes
Verify copy-paste accuracy

FAQ

Q: Is my text uploaded to a server?
A: No — all text comparison happens entirely in your browser. Your text never leaves your device.

Q: How does the diff algorithm work?
A: It uses a line-by-line comparison with LCS (Longest Common Subsequence) algorithm to identify added, removed, and unchanged lines.

Q: Can I compare large files?
A: The tool handles texts with hundreds of lines efficiently. For very large files, it may take a moment to process but works entirely client-side.