Diff Checker

Paste two versions of text side-by-side and see line-by-line differences highlighted in red (removed) and green (added).

Original

Modified

How to use Diff Checker

Compare two texts and highlight the differences.

Paste the original text into the left panel.

Paste the revised text into the right panel.

Differences are highlighted instantly — red for removed lines, green for added lines.

Is Diff Checker free to use?

Yes, Diff Checker is 100% free with no account required and no usage limits.

Is my data private?

Yes. Processing happens entirely in your browser. We never see, store, or transmit your input data.

Does Diff Checker work offline?

Yes. Once the page is loaded, text processing happens entirely in your browser with no internet connection required.

Is there a text size limit?

There is no hard limit. The tool handles large documents comfortably in most modern browsers.