Free Online Diff Checker — Compare Two Text Blocks
A “diff” shows you what changed between two versions of text — the lines added, removed, or edited. It's how developers review code changes, but it's just as useful for spotting the one edited clause in a contract or the difference between two drafts. Paste both versions and the tool highlights every change so nothing slips past you.
Frequently Asked Questions
- Can I compare code files?
- Yes — paste any text, code, or document content. The diff is computed line by line with clear highlighting.
- Is the diff computed on the server?
- No — the comparison runs entirely in your browser. Your text never leaves your device.