How does the diff checker work?

It splits both inputs into lines and compares each line at the same index, flagging differences and changes with color-coded styling.

Is my text private and secure?

Yes! All comparison computation occurs entirely inside your web browser. Nothing is uploaded to any server.

Yes! It works seamlessly with code, JSON, Markdown, essays, and configuration files.

You can compare thousands of lines of text smoothly in modern browsers.

Enter or paste the source text into the left box.

Enter the revised text into the right box.

Review the line-by-line comparison below with green (+) additions and red (-) deletions.

Modify either box to see comparison results update instantaneously.

Side-by-side visual line comparison

Color-coded additions (green) and modifications (red)

Line numbering for fast reference

100% client-side privacy — text never leaves browser

Instant real-time difference detection

Great for reviewing code pull requests, blog drafts, and contractual agreements.
Make sure matching lines align to simplify comparison scans.

Count words, characters, sentences, paragraphs, and estimate reading time online.

Remove duplicate lines from text lists, logs, and CSV files with removal stats.

Sort text lines alphabetically (A-Z, Z-A), by length, numerically, or shuffle randomly.