Text Diff Checker

Compare two texts and highlight every added and removed line.

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Files and text are processed locally in your browser. Tools that must reach the network say so explicitly.

About the Text Diff Checker

Compare two blocks of text and see exactly what changed. The Toolcenter Text Diff Checker uses a longest-common-subsequence algorithm to highlight added and removed lines, or switch to word-level diff for prose. Options let you ignore case and whitespace. Everything is computed in your browser.

How to use it

1Paste the original text on the left.
2Paste the changed text on the right.
3Choose line or word diff and set the ignore options.
4Review the colour-coded additions and deletions.

Key features

Line-level and word-level comparison
Ignore case and ignore whitespace toggles
Counts of unchanged, added and removed segments
Colour-coded, readable output
Local processing, no upload

Frequently asked questions

What is the difference between line and word diff?+

Line diff compares whole lines and suits code or lists; word diff highlights individual changed words and suits sentences and paragraphs.

Can it ignore formatting differences?+

Yes. Enable “ignore whitespace” to collapse spacing changes and “ignore case” to treat letters equally.

Is there a size limit?+

Very large inputs slow the algorithm, but typical documents of a few thousand lines compare instantly.

Is my text uploaded?+

No. The comparison runs entirely on your device.

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