Text Diff Checker
Text Tools
100% in-browser
Paste two versions of your text to see a line-by-line comparison with additions and removals highlighted.
Added
Removed
How to use the Text Diff Checker
- 1 Paste the original text on the left and the changed text on the right.
- 2 The differences highlight automatically as you edit.
- 3 Green lines are added, red lines are removed.
About the Text Diff Checker
A diff checker compares two pieces of text and shows exactly what changed — which lines were added, removed or kept. It is useful for reviewing edits to documents, comparing configuration files, or spotting changes between two versions of code.
This tool computes the difference using a line-based longest-common-subsequence algorithm, entirely in your browser. No text is uploaded, so you can safely compare private or proprietary content.
Frequently asked questions
Does it compare word by word or line by line?
It compares line by line, highlighting each added or removed line.
Is there a size limit?
There is no fixed limit, but very large inputs (tens of thousands of lines) may slow down since everything runs in your browser.
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