Diff Checker

Free diff checker. Instantly compare two blocks of text or code with clear line-by-line highlighting. Ideal for developers, writers, and data analysts.

Original Text

Changed Text

What is a Diff Checker?

A Diff Checker is a powerful tool that compares two versions of text and visually highlights exactly what changed. It shows additions in green and deletions in red, making it trivial to spot modifications at a glance.

How to Use the Diff Checker

Simply paste the original version on the left and the updated version on the right. The tool instantly calculates the differences. You can switch between:

Split View – Best for side-by-side comparison
Unified View – Best for seeing a clean changelog-style diff

Common Use Cases

Code reviews before committing to Git
Tracking revisions in legal documents, contracts, or proposals
Comparing configuration files or database exports
Reviewing changes in marketing copy or blog posts
Debugging differences between API responses

Frequently Asked Questions

Can it compare code files?

Yes. It works great for comparing code, JSON, configs, and any text-based files.

Is my data private and secure?

Yes. Our diff checker runs entirely locally in your browser. Your sensitive documents, code, and data never leave your device.