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NeatUtility

HTML Formatter & Minifier

XML & Markup100% Client-Side
Ready
TEXT
0 lines0 chars
0 B / 4.77 MB
About this tool, examples & FAQ

Format messy HTML into clean, well-indented markup or minify HTML to reduce payload size entirely within your browser without sending code to remote servers.

Key facts

Verified capabilities and limits of this utility
Formatter EnginePrettier HTML parser in an isolated Web Worker
Supported OperationsBeautify (format) and Minify
Privacy & Security100% Client-side execution; markup is never uploaded
Maximum Input5 MB

How to use

  1. Paste your HTML markup or snippet into the input editor.
  2. Choose your desired indentation size (2 or 4 spaces) or enable tabs in the options panel.
  3. Click 'Format HTML' to beautify the markup or select 'Minify HTML' to strip unnecessary whitespace.
  4. Copy or download the clean output for your templates or static site.

Examples

Format Nested Elements

Input

<main><section><h1>Title</h1><p>Paragraph</p></section></main>

Example output

<main>
  <section>
    <h1>Title</h1>
    <p>Paragraph</p>
  </section>
</main>

Minify HTML Markup

Input

<!-- Note -->
<div>  
  <p>  Hello   World  </p>
</div>

Example output

<div><p> Hello World </p></div>

Edge cases

Unclosed and mismatched tags

The formatter uses standard HTML5 parsing rules. Severely mismatched custom elements or illegal nesting produce helpful syntax error diagnostics pointing to the exact line and column.

Whitespace in inline elements

Inline elements like <span>, <a>, and <b> respect CSS whitespace semantics. Formatting preserves spaces around text boundaries to avoid breaking layout rendering.

Template tags and embedded scripts

Standard <script> and <style> blocks nested within HTML are preserved. For proprietary template languages with non-standard syntax, verify tag boundaries before minification.

How it works

  1. Parses the input markup into an Abstract Syntax Tree (AST) using Prettier's HTML parser inside a dedicated Web Worker.
  2. Walks the DOM tree and applies consistent structural indentation, attribute wrapping, and tag closing conventions according to W3C standards.
  3. Minification strips comments, collapses redundant whitespace tokens, and removes inter-tag indentation while preserving required text spacing.
  4. Dispatches the sanitized result directly back to the editor pane without network transmission.

Related workflows

Frequently asked questions

Is my HTML or code snippet uploaded to any server?

No. All parsing and formatting happens directly in your browser using Web Workers. No network requests are made with your data.

Does this formatter support modern HTML5 features?

Yes. Full HTML5 documents, self-closing void elements, custom elements (Web Components), SVG, and MathML tags are supported.

What is the difference between format and minify?

Formatting introduces indentation and newlines to maximize human readability for development and debugging. Minifying removes unnecessary whitespace and comments to optimize payload size for production deployment.

References