Diff Checker
Compare two text blocks line by line to spot additions, removals, and unchanged lines. Useful for config reviews, prompt revisions, copy edits, and code-adjacent text comparisons.
Unified diff
Common use cases
Practical ways developers use the diff checker in real workflows.
Review config changes
Compare two versions of a config file to spot exactly which settings were added, changed, or removed.
Check copy edits
Paste original and edited text side by side to see what a reviewer or editor changed.
Verify deployments
Diff the before and after of an API response or output to confirm a code change had the intended effect.
Frequently asked questions
Short answers to the questions people usually have before using the tool.
What diff algorithm does this tool use?+
It performs a simple line-by-line comparison, highlighting added, removed, and unchanged lines between the two inputs.
Can I compare code files?+
Yes. Paste any two text blocks — code, config files, or prose — and the tool shows the differences line by line.
Does it handle large files?+
The tool works well for typical text comparisons. For very large files (thousands of lines) a desktop diff tool may be more practical.
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