Free, runs entirely in your browser — no sign-up, no file upload to a server.
What does Diff Checker do?
It compares two texts and highlights exactly what was added, removed, or changed.
How do I use it?
Paste the original and modified text into the two panels — differences are highlighted automatically.
Is my input sent anywhere?
Everything runs in your browser — nothing you type or paste is sent to a server.
How do I report a problem or request a feature for this tool?
Use the Contact / Feedback page — select "Diff Checker" as the related tool so we know exactly which tool you mean, then describe the bug or the feature you'd like to see.