How do I compare two blocks of text?

Paste one version into each side of the diff checker. The tool highlights the lines that were added, removed, or changed between them.

Can I diff code as well as plain text?

Yes. It works for any text, including code, config files, logs, and prose.

Is my text uploaded to compare it?

No. The comparison runs in your browser, so sensitive content stays on your machine.

All tools/Query & Search

Text Diff Checker

Runs locally

Compare two text or code snippets locally to spot additions and deletions instantly.

Original Text

Modified Text

Diff Output

Paste original and modified text above to see the differences.

Compare two pieces of text or code and see exactly what changed — added, removed, and modified lines highlighted side by side. This diff checker runs in your browser, so you can compare sensitive content without sending it anywhere.

How to compare two texts

1Paste the original text on the left and the changed text on the right.
2Differences are highlighted line by line as you type.
3Scan the additions and deletions to review the changes.

Spot every change at a glance

A diff highlights exactly which lines were added, removed, or altered between two versions — far faster and more reliable than reading both texts and trying to spot the differences by eye. It's invaluable for reviewing edits to documents, config files, and code snippets.

Frequently asked questions

How do I compare two blocks of text?: Paste one version into each side of the diff checker. The tool highlights the lines that were added, removed, or changed between them.
Can I diff code as well as plain text?: Yes. It works for any text, including code, config files, logs, and prose.
Is my text uploaded to compare it?: No. The comparison runs in your browser, so sensitive content stays on your machine.