Text Diff Checker
+0 Added-0 Removed1 UnchangedSimilarity: 100%
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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.