Text Diff Checker
Paste two versions — see exactly which lines were added, removed or kept.
Quick answer: Free text diff checker: compare two texts or code snippets line by line. Added, removed and unchanged lines highlighted. Runs in your browser.
How to use
- Open this page on any device — no signup needed.
- Fill in the fields above.
- Get your result instantly — nothing is uploaded.
About this tool
A diff checker compares two texts and highlights the differences — indispensable for reviewing contract edits, article revisions, config files and code changes. This tool does a line-level comparison (LCS algorithm) with removed lines in red, added lines in green. For very large files, compare section by section.
FAQ
What do the colors mean?
Red = removed from the left (original), green = added in the right (new), grey = unchanged.
Is it character-level or line-level?
Line-level — the standard for documents and code.
Is there a size limit?
Best under ~300 lines per side in a browser tab; larger files get slow.