Free, Private, Client-Side Developer Tools

DevFormat AI is a suite of free formatting tools that beautify, minify and validate JSON, XML, HTML, CSS, SQL and JavaScript entirely in your browser. No account, no upload, no server — your code is processed locally and never transmitted anywhere. Load the page once and every tool keeps working offline.

Choose a tool

How it works

• 1. Pick a format above, or just paste — the engine auto-detects most formats.
• 2. Add code by pasting, typing, uploading, or dragging a file onto the input panel.
• 3. Beautify, minify or validate — with 2-space, 4-space or tab indentation and precise error line numbers.
• 4. Copy or download the result. Keyboard shortcut: Ctrl/Cmd + Enter beautifies.

Is it secure?

Yes — by architecture, not by promise. Every transformation runs as JavaScript in your own browser. There is no backend to send data to, nothing is logged or stored, and the tools work with your network disconnected. That makes DevFormat AI appropriate for configuration files, internal API payloads and other snippets that must never touch a third-party server.

From the blog

Guides on debugging and code hygiene: fixing "Unexpected token" JSON errors, JSON vs XML, what minification actually saves, and SQL formatting best practices. Browse all articles →