What is an online Diff Checker?

A Diff Checker is a tool that compares two text or code files and highlights all differences, making it easier to spot changes or errors.

Can I compare code with syntax highlighting?

Yes. Our Diff Checker supports syntax highlighting for popular programming languages, making it perfect for developers.

Absolutely. The tool is completely free, with no sign-up or watermark required.

Yes. The Diff Checker is 100% responsive and works seamlessly on smartphones, tablets, and desktops.

Yes. All comparisons are processed in your browser locally — no data is uploaded or stored on servers.

Side-by-side & unified views · load from URL · file upload · copy & share

Left / Original (paste, upload or load URL)

Right / Modified (paste, upload or load URL)

Ignore whitespace

Word-level diff

Result: —