Diff Checker
Compare two texts line by line. See added, removed, and unchanged lines with unified diff output. Download a .diff patch file. All processing happens locally.
Input
Two texts
Output
Unified diff
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FAQ
- What kind of diff does it produce?
- A unified diff with inline line coloring — added lines in green (+), removed in red (-), unchanged in gray. You can also download a standard .diff patch file.
- How is the diff computed?
- Using the jsdiff library's proven line-diff algorithm. Large texts are processed quickly — tens of thousands of lines in under a second.
- Is my text uploaded anywhere?
- No. All comparison happens locally in your browser.