Text Diff Checker
Compare two texts side-by-side with color-coded differences. See additions, deletions, and unchanged lines.
How to Use Text Diff Checker
- 1Paste the original text into the left editor pane.
- 2Paste the modified text into the right editor pane.
- 3Differences are highlighted automatically with color coding.
- 4Review additions (green), deletions (red), and unchanged lines.
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Frequently Asked Questions
How does the diff comparison work?▾
The tool compares text line-by-line. Lines present only in the original are shown as deletions (red), lines present only in the modified text are shown as additions (green), and matching lines are shown in gray.
Does it detect moved lines?▾
This is a simple line-by-line diff. Moved lines will appear as a deletion in the original position and an addition in the new position.
Can I compare code?▾
Yes, you can compare any text including source code, configuration files, logs, and more.
Is my data secure?▾
Yes, all comparison runs in your browser. No text is sent to any server.
What do the colors mean in the diff output?▾
Red lines with a minus sign indicate text that was removed from the original. Green lines with a plus sign indicate text that was added in the modified version. Gray lines are unchanged.
Can I compare large files?▾
Yes. The diff tool handles texts of any length, though very large files (thousands of lines) may take a moment to process. There is no hard character limit.
Does this work on mobile devices?▾
Yes. The diff tool runs entirely in your browser and works on any device with a modern browser, including phones and tablets.