Accurate diff
A longest-common-subsequence algorithm finds the minimal set of changes between the two texts.
Text Compare (Diff)
Paste two versions of a text and see the differences highlighted line by line. Case and whitespace options — everything happens locally.
Clear highlighting
Green for added, red for removed lines, plus a change counter.
In your browser
Neither text is sent anywhere — the comparison is entirely local.
Frequently asked questions
Are my texts sent anywhere?
No. The comparison runs entirely in your browser with JavaScript — nothing is uploaded or stored.
At what level does it compare?
Line by line. A single edited line shows as removed (old) and added (new) — the standard behaviour of most diff tools.
What do the case and whitespace options do?
“Ignore case” treats upper and lower case as equal; “ignore leading/trailing whitespace” disregards surrounding blanks when comparing (the original text is still shown as-is).
Is there a size limit?
Yes — up to 4,000 lines per side, to keep the comparison fast in the browser.