Diff Checker
Compare two text inputs line by line with highlighted changes
Last updated: October 14, 2026
How to use
- Paste or type your original text in the left field
- Paste or type your modified text in the right field
- Use options to ignore whitespace or case sensitivity if needed
- Select your preferred view mode (side-by-side or unified)
- Click "Compare" to show the differences
- Use "Copy" to copy the diff or "Download" to save as a patch file
- Red lines show deletions, green lines show additions
Result actions
Copy or download the tool output, or share a link to Diff Checker.
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Compare two text inputs
Paste original text and modified text to see line-by-line additions, removals, and unchanged lines. Choose a side-by-side or unified view. Within changed lines, the tool highlights differing characters. It also reports addition and deletion counts and lets you copy the displayed diff or download a patch-style text file.
Optional settings compare lines without case differences or normalize runs of spaces and tabs before comparing. Whitespace normalization trims line ends but preserves line breaks. This is a visual text comparison; the downloaded output is not guaranteed to apply with every patch utility.
Comparison runs locally in your browser.