Developer Tools
Diff Checker
Paste two versions of a text to see exactly what changed — added lines in green, removed lines in red. Perfect for comparing drafts, code or documents. Runs entirely in your browser, nothing uploaded.
+1 added−1 removed
Roses are red
Violets are blue
−Sugar is sweet
+And so are you
Frequently asked questions
How does the diff checker work?
It compares the two texts line by line and marks lines that were added (green) or removed (red), leaving unchanged lines plain.
Can I compare code?
Yes. It works for any plain text — code, prose, config files or documents — and preserves spacing in a monospace view.
Is my text private?
Completely. The comparison runs entirely in your browser, so nothing is uploaded — safe even for sensitive content.
Is it free?
Yes, free with no sign-up or limits.