Diff Checker
Compare two blocks of text with color-coded additions and deletions — 100% local processing
Original
Modified
About Diff Checker
A diff compares two versions of a text and shows what was added, removed, or left unchanged. It is the same idea that powers code review and version control, but available for any text you have on hand.
Paste the original on one side and the changed version on the other, and the differences are highlighted. Because the comparison runs in your browser, it is suitable for configuration files, code snippets, and other content you would rather not upload to a third-party service.
Common use cases
- Comparing two versions of a config file from different environments.
- Reviewing what changed between two API responses.
- Checking that a refactor or automated rewrite changed only what you intended.
- Spotting whitespace or line ending differences that break a script.
Frequently asked questions
- Why does the diff show every line as changed?
- Usually line endings (Windows CRLF versus Unix LF) or indentation differ. Normalize whitespace and try again.
- Can it compare files?
- Paste the file contents into each side. The comparison is text-based.
- Is my text uploaded?
- No. The comparison is computed in your browser.