Text Diff
Compare two blocks of text side by side, down to the word. Runs entirely in your browser — nothing is uploaded.
How it works
The comparison uses a longest common subsequence — the same family of algorithm behind git diff. It finds the largest set of lines that appear in both texts in the same order, then marks everything else as added or removed.
When a removed line and an added line line up, they are compared again word by word, so you see the exact token that changed instead of two entirely red and green lines.
Both texts stay in your browser: there is no upload, no request, and no server-side logging. You can disconnect from the network and it still works.