What is Diff Checker?
The Diff Checker compares two blocks of text and highlights the differences between them. It shows added, removed, and changed lines in a clear, colour-coded format. Useful for comparing code versions, checking document edits, verifying config changes, or spotting differences between any two pieces of text.
How to Use
Paste the original text in the left panel.
Paste the modified text in the right panel.
Click Compare to see the differences highlighted line by line.
Why Use This Tool?
Comparing text by eye is slow and unreliable, especially with longer content. This tool does it instantly and highlights exactly what changed. It runs entirely in your browser - your text is never uploaded or stored anywhere. No sign-up, no tracking.
FAQ
Yes. It works with any plain text - code, config files, documents, or anything else. It compares line by line.
There is no hard limit. It handles reasonably large text blocks, limited only by your browser's performance.
No. The comparison runs entirely in your browser. Your text stays on your device.