ToolsBench

Diff Checker

Compare two blocks of text line by line.

Original
Changed

About Diff Checker

Compares two blocks of text line by line and highlights what was added and what was removed — like git diff, but for anything you can paste: config files, contracts, SQL, translations, meeting notes. Perfect for spotting exactly what changed between two versions without reading both end to end.

How to use Diff Checker

1
Paste both versions
Original on the left, changed version on the right.
2
Read the diff
Green lines with + were added; red lines with − were removed. Unchanged lines stay neutral for context.
3
Iterate
Edit either side and the diff recomputes instantly.

Frequently asked questions

Is my data uploaded anywhere?
No. Everything you paste is processed by JavaScript running in your browser tab. Nothing is sent to a server, logged or stored — close the tab and it's gone.
Does it diff within a line?
Comparison is line-based: a changed line shows as one removal plus one addition. For prose, put each sentence on its own line to get finer results.