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Text Diff Checker - Compare Two Versions Line by Line

Paste both versions, hit Compare, and see exactly what changed - additions, deletions, and untouched lines.

See Every Change at a Glance

AiLoveKit's text diff checker runs a real longest-common-subsequence algorithm on your two versions, then highlights removed lines in red and added lines in green - the same approach as git diff, but for any pasted text. Contracts, essays, config files, and copy revisions all stay on your device.

How to Read the Output

Comparing PDF contracts instead? Use Compare PDFs for a visual page-level diff.

Frequently Asked Questions

How does the comparison work?

A line-based longest-common-subsequence algorithm aligns the two texts, so moved and edited lines surface as paired removals and additions.

Is there a size limit?

For a responsive experience, keep each side under 1500 lines. Larger texts still work but take longer.

Is my text uploaded?

No - the diff runs entirely in your browser tab. Sensitive drafts and contracts never leave your device.