🆚 Diff Checker
A fast, private diff tool for code reviews, config changes and copy edits.
🔒 Runs in your browser · files never uploaded
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How to use the Diff Checker tool
- Paste the old version on the left and the new version on the right.
- Line diff is the default; switch to word diff for prose.
- Download the unified .diff or copy it.
Frequently asked questions
Is this the same as git diff?
It uses the same Myers diff algorithm family, and "Download .diff" produces a unified patch you can apply with git apply or patch -p0.
Can I ignore whitespace or indentation changes?
Yes – tick "Ignore whitespace" in line mode to hide changes that only add or remove spaces and tabs.
Is my code uploaded?
No. Unlike many diff sites that store pastes on a server, the comparison runs entirely in your browser, so API keys or proprietary code never leave your machine.