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HTML Formatter & Minifier — Free Online HTML Beautifier

Beautify or minify HTML in your browser. Pure client-side — your markup never leaves your device.

Free No signup Client-side Privacy friendly Updated

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How to use

  1. 1 Paste your HTML into the input.
  2. 2 Pick Beautify for readable indented output, or Minify to strip whitespace and comments.
  3. 3 Copy or download the result.

Why use this tool

  • Powered by js-beautify — the de-facto JavaScript HTML formatter.
  • Beautify and Minify in one tool, switch instantly.
  • Pure client-side — code stays in your browser.
  • Configurable indent (2 or 4 spaces).

Frequently asked questions

Does the formatter preserve comments?

Beautify preserves HTML comments. Minify strips them — uncomment-sensitive workflows should use Beautify mode.

Will it break my inline JavaScript or CSS?

Both are detected and beautified per language. The formatter understands script and style blocks.

How big can the input be?

Performance scales linearly. Inputs under 1 MB format in milliseconds on a modern device.

What is HTML Formatter & Minifier?

An HTML Formatter is a tool that beautifies or minifies HTML markup. The beautify mode re-indents elements into a readable, structured layout, while the minify mode strips unnecessary whitespace to reduce file size. It runs entirely client-side in the browser, so the markup is processed on the device and never leaves it or gets uploaded to a server.

Features

Beautify

Re-indent nested elements into a clean, reviewable structure.

Minify

Strip whitespace and breaks to reduce markup size for delivery.

100% private

Runs client-side — your HTML never leaves the browser.

Example

Input

<ul><li>One</li><li>Two</li></ul>

Output

<ul>
  <li>One</li>
  <li>Two</li>
</ul>

Common use cases

  1. 1

    Read messy markup

    Format compressed or generated HTML so you can inspect its structure.

  2. 2

    Shrink before deploy

    Minify a fragment to cut bytes on a size-sensitive page.

  3. 3

    Clean up copy-pasted HTML

    Normalize indentation from mixed sources into one consistent style.

How HTML Formatter & Minifier compares to alternatives

HTML Formatter & Minifier versus typical browser and desktop alternatives — features compared at a glance.
Feature Zerethon Tools Typical online tools Desktop apps
Signup required No Sometimes No (IDEs)
Markup leaves device No Yes No
Beautify + minify Both Sometimes Both
Free Yes Yes Often paid
Works offline Yes (after load) No Yes
Summary

Zerethon's HTML formatter beautifies or minifies markup entirely in your browser. Beautify re-indents elements into a readable tree; minify strips unnecessary whitespace to shrink file size. Nothing is uploaded.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. HTML Formatter & Minifier runs entirely client-side — no server upload, no logging, no tracking of your input.

Compare

Markdown vs HTML

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