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Text & Code Diff Checker

Compare two text or code snippets side-by-side to highlight differences and changes.

About the Text Diff Checker

A diff checker compares two versions of text or code and highlights exactly what changed — what was added, removed, or modified. It's invaluable for code reviews, spotting content edits, and comparing configuration files.

Paste both versions and the differences are highlighted instantly, all within your browser.

How to use the Text Diff Checker

  1. 1

    Paste the original

    Put the first version of your text or code on the left.

  2. 2

    Paste the changed version

    Put the second version on the right.

  3. 3

    Review the differences

    Additions and deletions are colour-coded line by line so changes are easy to spot.

Frequently asked questions

What can I compare?
Any plain text or code — source files, configuration, articles, JSON, logs, and more.
Is my content private?
Yes. The comparison runs entirely in your browser and nothing is uploaded.
Does it work for large files?
It handles typical files and snippets well. Very large files are compared in-browser, so performance depends on your device.

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