Text Diff Checker
Compare two blocks of text line by line and see exactly what was added, removed, or unchanged.
Original
Changed
Differences — 2 added, 1 removed
The quick brown fox
jumps over the lazy dog
jumps over a lazy dog
The end.
Free to use, no sign-up, no limit on how many times you run it.More text tools
Overview
Useful for comparing two versions of a document, checking what changed between drafts, or reviewing edits without a full version control setup.
- Clear visual highlighting of added and removed lines
- Optional case-insensitive comparison
- No file size limit imposed by a server
How to use it
- 1Paste the original text on the left
- 2Paste the changed version on the right
- 3Review the highlighted differences below
Frequently asked questions
Does this compare word by word or line by line?
Line by line — each line is treated as a single unit when comparing, which works well for code, lists, and paragraph-per-line content.
Is my text uploaded anywhere?
No — the comparison runs entirely in your browser using a local diff algorithm.