Diff Checker
Paste two versions of a text or file and see exactly which lines were added, removed, or unchanged. Comparison happens locally in your browser.
About this diff tool
The diff checker compares texts line by line using the same longest-common-subsequence approach as classic Unix diff and Git. Removed lines are shown in red with a - marker, added lines in green with +, and both versions' line numbers are displayed so you can locate changes in your editor.
Frequently asked questions
Is my text uploaded anywhere?
No. Both texts are compared entirely in your browser's memory. This makes the tool safe for contracts, source code, and other confidential content.
What do the options do?
Ignore whitespace treats lines as equal if they differ only in leading or trailing spaces/tabs — handy for code that was re-indented. Ignore case treats Hello and hello as the same line.
Is there a size limit?
Each side can be up to 3,000 lines. For larger files, split them or use a desktop tool like git diff.
Last updated: 2026-07-11