Text Diff Checker
Free text diff checker. Compare two pieces of text instantly — additions and removals highlighted line by line. Runs entirely in your browser.
Runs in your browserUpdated Apr 26, 2026
Original
Changed
Diff
Diff will appear here…
Frequently asked questions
›Is my text sent to a server?
No — diffing happens entirely in your browser.
›Can it diff very long text?
Yes — anything your browser can hold in memory. Multi-page documents work fine.
›Does it ignore whitespace?
By default we count whitespace differences. Toggle 'ignore whitespace' to focus on real changes.
›Word-level or line-level diff?
Currently line-level. For word-by-word diff inside a line, paste a single line on each side.
›Is the diff checker free?
Yes — fully free, no signup.