Diff checker & text compare

Spot exactly what changed between two versions of a document, config, or code block, with a color-coded unified diff and per-side change statistics.

How to Diff checker & text compare

1. Step 1. Paste the ORIGINAL text into the Input Buffer.
2. Step 2. Paste the CHANGED text into the Right Buffer above it.
3. Step 3. Click Compare to view the unified diff (+, −, unchanged) in the Output Buffer.

Frequently asked questions

How is the diff computed?

A longest-common-subsequence algorithm produces minimal line-level additions (+) and removals (−), so the diff stays readable and compact.

Can it diff code and config files?

Yes. Diffing is line-based and language-agnostic, so it works for code, YAML/JSON config, logs, and prose alike.

Is my text uploaded?

No. The entire comparison runs in your browser.