AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I format and beautify code online?

Paste code into AnyTool and it formats it with Prettier-grade accuracy across JavaScript, TypeScript, CSS, SCSS, HTML, JSON, YAML, Markdown, GraphQL, SQL, and XML. The language is auto-detected, formatting is live, and everything runs in your browser with no upload.

  • Prettier-based formatting for many languages, auto-detected
  • Options for indent, quotes, semicolons, print width
  • js-beautify fallback for minified or messy code
  • Copy, download, and file drag-and-drop
  • 100% in-browser — no upload, works offline

What is

Code Formatting

Code formatting (beautifying) re-indents and restructures source code to a consistent, readable style without changing its behavior. Parser-based formatters like Prettier rebuild the code from its syntax tree, producing reliable output across many languages.

Developer Tools

Related terms

PrettierBeautifierLintingSyntax TreeCode Style

Frequently Asked Questions

No — formatting runs entirely in your browser.

The formatter engines are bundled locally and run client-side, so your code never leaves the browser — unlike AI or server-side formatters — and the tool works offline after first load.

JS, TS, JSX, CSS, SCSS, LESS, HTML, JSON, YAML, Markdown, GraphQL, SQL, and XML.

It uses Prettier for AST-correct formatting of JavaScript, TypeScript, JSX, CSS, SCSS, LESS, HTML, JSON, JSONC, YAML, Markdown, and GraphQL, and adds dedicated engines for SQL and XML, with the language auto-detected from your input.

Yes — a js-beautify fallback handles minified or non-standard input.

When code is minified or would make Prettier throw, the tool can fall back to js-beautify, which also gives brace-style and wrap control that opinionated formatters do not, so messy blobs still come out readable.

Detailed Explanation

Methodology

How the Code Formatter Works

AnyTool formats code with Prettier (the prettier/standalone browser entry plus per-language parser plugins) for AST-correct output across JavaScript, TypeScript, JSX, CSS, SCSS, LESS, HTML, JSON, JSONC, YAML, Markdown, and GraphQL, and adds dedicated engines for SQL and XML. The language is auto-detected from the input or file extension, options like indent, quotes, semicolons, and print width are configurable, and a js-beautify fallback handles minified or messy code that Prettier would reject, with brace-style control. Plugins load on demand per language.

  • Prettier-based formatting across many languages
  • SQL and XML via dedicated engines
  • Auto-detect language plus manual override
  • js-beautify fallback for minified/messy code
  • Lazy per-language plugin loading, runs in a Web Worker
Privacy & Security

Privacy and Offline Use

All formatter engines are self-hosted and run client-side, so code is never sent to a server — unlike AI or server-side formatters with opaque processing. With plugins cached, the tool works offline and there is no runtime CDN.

Code Formatter: AnyTool vs typical tools
CapabilityAnyToolTypical tools
EnginePrettier + js-beautifyOften naive indenters
Language breadthWide (real parsers)Varies
Processing locationIn-browserOften opaque/server
Minified-code cleanupYes (fallback)Rare
Works offlineYesNo

Capabilities reflect the live AnyTool tool; competitor behavior varies by service.