Compare Text Locally Without Uploading — No Sign-up, Instant Diff

Compare two text blocks and see differences highlighted side by side — all in your browser. Your text is never uploaded or stored anywhere.

Frequently Asked Questions

What does a text diff checker do?

A diff checker compares two text blocks and highlights the differences — showing which lines were added (green), removed (red), or unchanged. Widely used by developers and editors.

Does the diff checker upload my text to a server?

No. Text comparison runs entirely in your browser using JavaScript. Your content stays on your device — no upload, no storage.

Can I compare code files with the diff checker?

Yes. Paste any code — JavaScript, Python, JSON, SQL, HTML, or plain text — and the diff checker highlights syntax-level differences.

Does the diff checker support line-by-line or word-by-word comparison?

The tool supports line-by-line comparison with word-level highlighting within changed lines, making it easy to spot small edits.