Diff Checker
Compare two texts and see the differences
0 lines total+0 added-0 removed0 unchanged
Enter text in both panels to compare...
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How to Use
- 1Paste the original text in the first panel
- 2Paste the modified text in the second panel
- 3See differences highlighted: green for additions, red for deletions
- 4Copy or download the diff output
Features
- Line-by-line comparison
- Color-coded differences
- Line numbers for both texts
- Statistics (added/removed/unchanged)
- Works with any text format
- Runs entirely in browser
Use Cases
The diff checker is useful for comparing code changes, document revisions, configuration files, and any text where you need to identify what changed between two versions.
- • Compare code before and after refactoring
- • Review changes in configuration files
- • Check differences in API responses
- • Compare document drafts
- • Verify data transformations
FAQ
Is my data safe?
Yes. The comparison runs entirely in your browser using JavaScript. Your text is never sent to any server.
How does the diff algorithm work?
This tool uses a Longest Common Subsequence (LCS) algorithm to identify the minimal set of changes needed to transform one text into another.
Is there a size limit?
There is no fixed limit. Since processing happens in your browser, very large texts may be slower to compare. Most typical use cases work instantly.