Text Tool
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.
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
Why Use Our Diff Checker?
Unlike many online diff tools, ours runs entirely in your browser. Your sensitive documents, code, or data never leave your device — perfect for confidential work.
It also supports two viewing modes (Split and Unified) so you can choose the format that works best for your review process.
The tool is completely private — your documents never leave your browser. This makes it safe to use with sensitive code, legal documents, or internal data.