Code Beautifier

Reindent minified JSON so it's readable, or minify a JSON blob into one line for shipping. Runs in your browser — your code stays on your device.

Conversions
Beautify

About Code Beautifier

Code Beautifier formats, indents, or minifies JSON, HTML, CSS, and JavaScript directly in your browser. Paste minified JSON to read the schema; paste a giant CSS file to strip whitespace before deploying; paste a JS bundle to see it line-by-line. The formatter uses standard parsers (Prettier-style for JS, htmlparser2 for HTML, css-tree for CSS) — all compiled to run client-side. Because everything runs locally, internal code or config files containing API keys stay on your device the whole time.

Best for

  • Pretty-printing an API response JSON to read its schema
  • Minifying a production CSS or JSON file before deploy
  • Indenting a messy vendor HTML snippet you need to grep through

Pros

  • +JSON, HTML, CSS, JavaScript all in one tool
  • +Both beautify and minify directions supported
  • +Local parsers — internal code and API keys stay on your device

Cons

  • −Very large files (multi-MB) format slowly on a phone
  • −JS minify does not run aggressive tree-shaking — use your bundler for that

How to use Code Beautifier

  1. 1

    Select or upload the source files from your local device storage.

  2. 2

    Specify conversion settings, options, or target output formats.

  3. 3

    Wait for the client-side browser logic to process the files securely.

  4. 4

    Download the finalized outputs directly to your system.

Frequently Asked Questions

Why choose this over my editor's built-in formatter?
This tool is one click without opening a project, without an interrupting keystroke. Useful for pasting a JSON response from a curl, a CSS fragment from a Slack message, or a minified JS snippet from a vendor — you get indented, readable output in seconds.
Does minify for JS do full tree-shaking?
No — minify here strips whitespace and removes comments. It does not run dead-code elimination or scope mangling. Use your bundler (Vite, esbuild, webpack) for production-grade minification; this is a quick paste-and-minify for snippets.
Does it preserve JSON key order?
Yes. Beautification only changes indentation and spacing; object key order is preserved exactly. Same for arrays and primitive values.
What's the maximum file size?
Files up to a few MB format in a second on a modern laptop. Phone-class devices slow down on multi-MB JSON. For very large outputs, paste a slice rather than the whole file.
Is my code uploaded during beautify?
Never. Parsers (Prettier-style, htmlparser2, css-tree) all run client-side in your browser. Internal code, API keys, and config files stay on your device the whole time.

Related tools

FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

USER REVIEWS

Code Beautifier Quality Rating

4.8
25 reviews

How was your experience? You need to convert and download at least one file to provide feedback!