Diff Checker

Compare two texts and see a line-by-line diff with added and removed lines highlighted — a fast, private text compare tool.

Runs 100% in your browser•Nothing is uploaded to a server•Instant results

Compare two texts

Original

Changed

Result

Paste text into both boxes above and click Compare to see a line-by-line diff.

About the diff checker

This free diff checker (text compare tool) puts two versions of your text side by side and highlights exactly what changed, line by line — added lines in green, removed lines in red. It uses a longest-common-subsequence algorithm to find the smallest set of changes between the two texts. Everything runs client-side in your browser, so nothing you paste is uploaded to a server.