Diff Checker

Online

Original

Modified

About

Diff Checker is a free online tool for comparing text, code, and JSON. Paste two versions and instantly see what changed. All processing runs in your browser — no data is sent to any server.

How to use

Paste original text in the left panel
Paste modified text in the right panel
Click Compare or press Cmd+Enter
Switch between Unified and Split view

Features

Line-by-line comparison
Unified and side-by-side split view
Added / removed / unchanged line count
Copy diff to clipboard
Works with text, code, JSON, XML