Text Diff
Compare two texts line by line and highlight changes.
Text Diff compares original and changed text using a line-based LCS algorithm. Added, removed, and unchanged lines are highlighted so you can spot edits quickly. Comparison runs entirely in your browser.
Frequently Asked Questions
Does my text leave the browser?
No. This tool runs entirely in your browser. Nothing is uploaded to our servers.
Is this a character-level or line-level diff?
Line-level. Each line is compared as a whole; partial line edits show as remove + add.
Can I diff very large files?
Small to medium pastes work best. Extremely large texts may slow the browser because the algorithm is O(n×m).