QKitBoxText diff checker
Compare two versions of a text line by line — additions in green, deletions in red. Useful for config files, listing copy and code snippets.
Paste two texts and press Compare.
How it works
The comparison is a longest-common-subsequence diff over lines: unchanged lines pass through, lines only in the new text are marked with +, lines only in the original with −. Identical texts produce no markers. Everything runs locally — compare anything without it leaving the page.
Frequently asked questions
Is it character-level or line-level?
Line-level, like a compact git diff. Character-level diffs get noisy on prose; line-level shows the intent.
Does case matter?
Yes — "Title" and "title" are different lines. Trim the whitespace option only normalizes padding.
Written and maintained by Steven Huang · Last reviewed October 29, 2026.