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

How do I format and beautify HTML?

Paste HTML into AnyTool's HTML Formatter and it reindents the markup, formats embedded CSS and JavaScript, and shows a live render preview. You can also minify. Formatting runs in your browser, so your code is never uploaded.

  • Beautify with indentation control, plus a minify mode
  • Formats embedded <style> CSS and <script> JS too
  • Live sandboxed render preview alongside the code
  • 100% in your browser — no upload, no signup, free

What is

HTML Formatting

HTML formatting (beautifying) reindents markup with consistent nesting and line breaks to make it readable, while minifying collapses whitespace and removes comments to shrink it. Good formatters also tidy embedded CSS and JavaScript.

Developer Tools

Related terms

HTML BeautifierMinifyPretty PrintIndentation

How to Format HTML

Beautify or minify HTML entirely in your browser with a live preview.

10 secWeb browser
  1. 1

    Add HTML

    Paste your HTML or drop an .html file.

  2. 2

    Beautify or minify

    Choose a mode and set indentation and output options.

  3. 3

    Preview & copy

    See the live render preview, then copy or download the result.

Result: Formatted or minified HTML

Frequently Asked Questions

No — formatting happens entirely in your browser, so your code is never uploaded.

AnyTool beautifies and minifies HTML locally with a bundled engine, so it works offline and your markup never reaches a server. The live preview renders in a sandboxed iframe that cannot execute scripts.

Yes — CSS in <style> and JS in <script> blocks are formatted too.

The formatter tidies inline CSS and JavaScript inside your HTML, a standout feature compared with formatters that only reindent the markup.

Yes — switch between beautify and minify in the same tool.

Beautify reindents for readability with your chosen indentation, and minify collapses whitespace and strips comments, showing the bytes saved.

Detailed Explanation

Methodology

How HTML Formatting Works

AnyTool beautifies HTML with js-beautify, which reindents markup and also formats embedded CSS in <style> blocks and JavaScript in <script> blocks. A minify mode collapses whitespace and strips comments, reporting bytes saved measured as UTF-8 length. A live render preview is shown in a sandboxed iframe (no allow-scripts) so pasted HTML cannot execute. Large documents are formatted in a Web Worker. Everything runs in-browser with no runtime CDN, so markup is never uploaded.

  • js-beautify reindents markup and embedded CSS/JS
  • Minify mode with UTF-8 byte-savings stats
  • Sandboxed iframe live preview (scripts disabled)
  • Web Worker for large documents
  • Bundled, no runtime CDN; no upload