Diff Checker
Paste your original and changed text below to see exactly what's different between them.
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What is a diff checker?
A diff checker compares two pieces of text and highlights the differences between them: lines or words that were added, removed, or left unchanged. It's the same idea behind the "track changes" feature in word processors, or the diff view you see in Git when reviewing a code change.
This tool works entirely in your browser. Nothing you paste is uploaded anywhere, which makes it safe to use even with private code, configuration files, or drafts.
Frequently asked questions
- Is this diff checker free to use?
- Yes, it's completely free with no sign-up or usage limits.
- Does my text get uploaded to a server?
- No. The comparison runs locally in your browser using JavaScript — your text never leaves your device.
- Can I compare code with this tool?
- Yes, it works for any plain text, including source code, configuration files, and JSON. For JSON specifically, try the JSON diff checker for automatic pretty-printing before comparison.