Diff Checker
Compare code and text with unified diff patch generation
About Diff Checker
How Diff Checker Works
Paste original and modified text to see additions in green, deletions in red, and copy unified git patches.
The Diff Checker performs high-performance Myers line-by-line and word-level text comparison to produce structured visual differences and standard unified diff patches. It highlights additions in emerald, deletions in rose with strikethroughs, and computes similarity ratios. Developers use it to compare JSON responses, inspect configuration changes, review pull request patches, and verify data transformations before committing code.
Frequently asked questions
Can I copy a standard unified diff patch?+
Yes. Click 'Copy Unified Diff' to get standard git-compatible patch syntax.
Is any comparison data uploaded?+
No. Comparison algorithms execute 100% locally in your browser.
Limitations
Very large files with over 100,000 lines may require a few seconds of browser memory allocation for matrix computation.