Does it compare word by word or line by line?

It highlights word-level additions and removals between the two texts you paste in.

Can it compare longer documents, not just short snippets?

Yes, paste in full paragraphs or documents, differences are still highlighted clearly regardless of length.

Does it ignore whitespace differences?

By default whitespace changes are treated as differences too, since sometimes that's exactly what you're checking for.

Does Text Diff Checker upload my files to a server?

No. Text Diff Checker runs entirely in your browser using on-device processing, your files never leave your device.

Text Diff Checker

Compare two blocks of text and highlight the differences.

Runs in your browser

Original text

Changed text

About this tool

Comparing two blocks of text by eye to find every difference — a revision, an edited draft — is slow and easy to miss things in, especially in longer text. This tool compares two blocks of text and highlights the differences, showing you exactly what changed instead of a manual side-by-side read-through.

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