Diff Checker

Visual diff for two text inputs: additions, deletions, and changes at character, word, or line level. Processed entirely in your browser — nothing is uploaded.

100% local — your text never leaves this device

Original

Modified

Diff level

Layout

Ignore whitespace

How to use Diff Checker

1Paste original and modified text into the two fields
2Choose character, word, or line diff and side-by-side or inline layout
3Turn on Ignore whitespace to compare without space and line-break noise
4Click Compare Now — additions appear in green, deletions in red
5Use Swap sides to exchange the two texts

Privacy

Diffing runs entirely in your browser. Your text is never sent to a server.

🔒 Processed locally in your browser. Your data never leaves this device.