Text Diff Checker

Free online tool to compare two texts and highlight added, deleted, and changed lines. It runs line-by-line comparison with the Myers diff algorithm, the same family Git uses, and supports inline diff within lines.

Original text (Old)

Modified text (New)

+0 Added-0 Removed1 UnchangedSimilarity: 100%

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<p><a href="https://devtools.patrache.studio/en/text/text-diff/">Text Diff Checker</a> by
   <a href="https://patrache.studio/">Patrache Studio</a></p>

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Last updated: 2026 · Free online tool

What is Text Diff Checker?

Free online tool to compare two texts and highlight added, deleted, and changed lines. It runs line-by-line comparison with the Myers diff algorithm, the same family Git uses, and supports inline diff within lines.

How to Use

1
Enter text— Enter text in the left (original) and right (modified) panels.
2
Select view mode— Choose between Unified or Side-by-side view.
3
Check results— Green (+) indicates added lines, red (-) indicates deleted lines.
4
View statistics— Check the number of added/deleted lines and similarity in the stats bar.
5
Swap direction— Use the swap button to reverse the comparison direction.

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Frequently Asked Questions

It performs line-by-line comparison based on the Myers diff algorithm, the same family of algorithms used by Git.

Yes, inline diff that highlights changed parts within a line is also supported.

No. Only text-based comparison is supported.

Up to 500KB is supported. Larger texts may cause browser performance issues.

No. All comparison operations are performed in the browser.

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