Diff Tool
Paste two versions and instantly see the differences, line by line. Added lines in green, removed in red — nothing uploaded.
No differences — the two texts are identical. added · removed
How it works
The two inputs are compared with a longest-common-subsequence algorithm that finds the smallest set of line additions and deletions, then renders them as a unified diff — all locally.
100% client-side — nothing you paste is ever uploaded.
Frequently asked questions
What kind of diff is this?
A line-by-line comparison, like a git diff. Added and removed lines are highlighted, with unchanged lines kept for context.
Is my text uploaded?
No — the comparison runs entirely in your browser, so it's safe for private code and documents.