Diff Checker

Paste your original text on the left and the modified text on the right to instantly highlight changes. Green denotes additions, red denotes removals.
Comparison result will appear here...

How the Diff Checker Works

A Diff Checker (short for Difference Checker) is an essential tool for developers, writers, and editors. It compares two blocks of text line by line to highlight exactly what has changed between an original version and a modified version.

Whether you are reviewing code commits, checking revisions on an essay, or ensuring no accidental deletions were made in a legal document, this tool makes it easy to spot:

  • Additions: New text that has been inserted (highlighted with a +).
  • Deletions: Text that has been removed (highlighted with a -).
  • Unchanged Text: Content that remains exactly the same.

Frequently Asked Questions

Is my data safe and private?

Yes. This tool runs entirely in your browser using client-side JavaScript. None of the text you paste is uploaded to a server, stored, or saved in any database.

Can I compare programming code with this tool?

Absolutely. You can paste HTML, CSS, JavaScript, Python, or any other plain text code. The tool will preserve your line breaks and highlight the syntax differences line by line.

Is there a limit to how much text I can compare?

There are no strict limits imposed by the tool itself, but extremely large files (e.g., hundreds of thousands of lines) might cause your web browser to slow down while rendering the comparison.