Diff Checker
About the Diff Checker
Compare text or files side by side with highlighted differences. Free online diff tool for code, text, and documents.
The Diff Checkerruns entirely in your browser — your data is never uploaded to a server, so it stays private and works instantly, even offline. It's completely free, requires no sign-up, and works on desktop and mobile.
Frequently Asked Questions
- How do I compare two texts online?
- Paste your original and modified text into the two panels. Differences are highlighted instantly with additions in green and deletions in red.
- Can I compare files with the diff checker?
- Yes. You can upload files directly or paste their content. The tool supports any plain text format including code, CSV, and configuration files.