How to use the Diff Checker
- Paste the original text on the left.
- Paste the changed text on the right.
- Review highlighted additions and removals below, by line, word or character.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This Diff Checker processes everything locally in your browser tab. There is no server round-trip, no logging and no storage of your input.
Frequently asked questions
Is this Diff Checker free?
Yes. This Diff Checker is completely free to use with no sign-up, no limits and no ads inside the tool.
Is my data uploaded to a server?
No. The Diff Checker runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Can I use the Diff Checker offline?
Yes. Diff Checker is also built into DevT Pro, a native app for Mac, Windows, iPad and Linux with 120+ developer tools that work fully offline. It is a $5.99 one-time purchase with no subscription.
