Data formatters

HTML Formatter and Minifier

Format or minify HTML snippets locally as text without rendering untrusted markup.

Runs locally in your browser

Drop an HTML fileLoads HTML locally as text. The markup is not rendered or uploaded.

Choose file

HTML input

Original112 B

Result158 B

Saved0 chars

Formatted HTML

<main>
  <h1>
    Lumio
  </h1>
  <p>
    Fast
    <strong>
      browser-first
    </strong>
    tools.
  </p>
  <img src="/favicon.svg" alt="Lumio">
</main>

HTML is processed as text only. Untrusted markup is not rendered in the page preview.

How to use this tool

Paste HTML or drop a local `.html` file into the tool.

Choose Format for readable indentation or Minify for compact markup.

Copy the result for documentation, snippets, templates, CMS fields, tests, or manual review.

Safe text-only HTML handling

The tool treats HTML as text and shows the result inside a code block.

It does not render pasted markup as live DOM, so scripts, event handlers, iframes, and remote resources are not executed by the formatter preview.

This is safer for inspecting snippets from unknown sources, but untrusted HTML should still be sanitized before it is published.

Formatting versus minifying

Formatting makes nested tags easier to inspect by adding line breaks and indentation.

Minifying removes comments and unnecessary whitespace to make small snippets more compact.

For production HTML generated by frameworks, keep using your build pipeline; this tool is meant for snippets, templates, debugging, and quick cleanup.

Important limitations

This browser-side formatter is intentionally conservative and does not run a full HTML5 parser.

Complex malformed documents, inline JavaScript, template syntax, and whitespace-sensitive content may need manual review.

Use HTML Entity Encode and Decode when your goal is escaping visible text for safe display inside HTML.

Examples

Format a compact snippet

Input

<main><h1>Lumio</h1><p>Fast tools</p></main>

Output

<main>
  <h1>
    Lumio
  </h1>
  <p>
    Fast tools
  </p>
</main>

Minify a short template

Input

<section>
  <p>Hello</p>
</section>

Output

<section><p>Hello</p></section>

FAQ

Does this render my HTML?

No. The tool processes HTML as text and displays the result in a code block instead of rendering the markup.

Can HTML contain dangerous JavaScript?

Yes. HTML can include scripts, event handlers, iframes, and remote resources. Sanitize untrusted HTML before publishing it.

Is my HTML uploaded?

No. Formatting and minifying run locally in your browser.

Should I use this for production build minification?

Use your framework or build tool for production HTML. This tool is for snippets, debugging, templates, and manual cleanup.