🔧 Diff Checker
Compare two texts side by side and highlight differences line by line.
Input
Output
Ready — enter input to start
Frequently Asked Questions
What is Diff Checker used for?
Diff Checker is a developer tool that runs entirely in your browser. Enter your input and get instant results.
Is my data sent to a server?
No. All processing happens locally in your browser. Your data never leaves your device — zero server communication.
Is this free to use?
Yes. Diff Checker is completely free, no sign-up required, no rate limits, no ads. Just open and use.