What is an Online Code Formatter?

Online Code Formatter is a free web-based beautifier that rewrites messy, minified, or poorly indented source code into a clean, consistent layout. It supports HTML, CSS, JavaScript, TypeScript, JSON, and XML, making it easy to read, debug, and share code. Unlike a compiler or linter, it only changes formatting and never alters what your code does.

This tool works entirely in your browser, so your code never leaves your device — no uploads, no servers, no sign-up required.

Why use our code formatter and beautifier?

Instantly readable code: Auto-indent nested blocks, add consistent spacing, and line-wrap long statements.
Find bugs faster: Clean layout makes missing brackets and mismatched tags obvious at a glance.
Multiple languages: Switch between HTML, CSS, JavaScript, TypeScript, JSON, and XML, or let the tool auto-detect.
Customizable style: Choose space or tab indentation, set the indent width and print (column) width, and toggle single quotes.
Side-by-side preview: Watch the formatted output update live as you type.

How to format code online

Paste your code into the input editor, or click Try sample to load an example.
Pick a language — choose one manually or use Auto detect.
Tune formatting options: indent type, indent width, and print width.
Review the output, then Copy it to your clipboard or Download it as a formatted file.

Code formatter FAQ

Which languages are supported?

HTML, CSS, JavaScript, TypeScript, JSON, and XML. Use Auto detect and the tool picks the matching mode for your input.

Does formatting change what my code does?

No. Code formatting only re-arranges whitespace, indentation, and line breaks. It does not fix syntax errors or change behavior, so always review the result before using it.

Is my code uploaded to a server?

No. Formatting runs entirely in your browser, keeping your code private and offline.