Free to use?
Yes, completely free. No sign-up, no limits. Runs 100% in your browser.
Code sent to server?
No. All formatting, minification, and diff logic runs in JavaScript in your browser tab.
Languages supported?
JSON, JavaScript, HTML, and Plain Text. Diff works with any plain text.
How does diff work?
Line-by-line comparison. Red = removed, green = added, yellow = changed.
Large files?
No hard limit — very large files may pause briefly. Most real-world files are instant.