HTML Prettier

What is HTML Prettier?

An HTML prettifier formats messy, minified, or inconsistently indented HTML documents with proper tag hierarchy, line breaks, and attribute alignment. Clean HTML is essential for code reviews, template debugging, email markup inspection, and maintaining readable web page source that teams can navigate and edit confidently.

Production websites routinely serve minified HTML to reduce page weight and improve load times. Build tools, CMS exports, and email template generators often output single-line HTML that is functionally correct but humanly unreadable. A prettifier restores visual structure without altering document behavior, attributes, or content.

Our HTML prettifier uses industry-standard formatting rules to produce consistent, well-indented markup. Each nested element indents further, sibling elements align, and self-closing tags are handled correctly. The formatted output renders identically in browsers — only whitespace between tags changes.

All formatting runs locally in your browser. HTML templates containing tracking pixels, user personalization tokens, and proprietary markup never upload to external servers. This privacy guarantee supports teams working with confidential email campaigns and internal admin interfaces.

HTML often appears alongside CSS and XML in web projects. Use the CSS Minifier for stylesheet compression, the XML Formatter for SVG and RSS markup, and the JSON Formatter for embedded JSON-LD structured data scripts.

When should you use HTML Prettier?

Debug HTML email templates that render incorrectly in specific clients. Formatted markup reveals unclosed tags, missing table structures, and inline style issues that cause layout breaks in Outlook, Gmail, or Apple Mail.

Review HTML output from server-side template engines (Jinja, EJS, Handlebars, Razor) during development. Prettifying rendered output helps verify that conditionals, loops, and partials produced the expected DOM structure.

Inspect HTML scraped or exported from CMS platforms, page builders, and WYSIWYG editors. These tools often produce verbose, inconsistently formatted markup that benefits from normalization before manual editing.

Prepare HTML examples for documentation, tutorials, and accessibility audits. Readable markup helps reviewers evaluate semantic structure, ARIA attributes, and heading hierarchy.

How to Use HTML Prettier

1. Paste HTML into the editor.
2. Click Prettify to format with indentation.
3. Review the formatted HTML structure.
4. Copy or download the prettified output.

Features

• Prettify HTML with proper tag hierarchy indentation
• Preserve all attributes, content, and document structure
• Upload .html files via drag-and-drop for quick formatting
• Copy prettified output or download as a .html file
• Handles nested elements, void elements, and inline content
• Runs locally — HTML never uploaded to servers
• Supports HTML5 semantic elements and custom data attributes
• Instant formatting with no sign-up required

Example

The minified input compresses a page layout into a single line. Prettifying expands each element to show the semantic structure: container div wrapping header (with h1 and nav) and main (with paragraph). Navigation links become visible as sibling anchor elements. This layout makes it easy to verify heading levels, link hrefs, and nesting during code review without manually tracking opening and closing tags.

<div class="container"><header><h1>Welcome</h1><nav><a href="/">Home</a><a href="/about">About</a></nav></header><main><p>Hello, world!</p></main></div>

<div class="container">
  <header>
    <h1>Welcome</h1>
    <nav>
      <a href="/">Home</a>
      <a href="/about">About</a>
    </nav>
  </header>
  <main>
    <p>Hello, world!</p>
  </main>
</div>

Common Errors

Best Practices

• Prettify HTML before code review to make diffs meaningful
• Validate markup with an HTML linter before and after prettifying
• Keep minified HTML for production; prettify only for development and debugging
• Process locally when templates contain user data or tracking identifiers
• Verify rendered output after prettifying inline-heavy content
• Use semantic HTML5 elements for better accessibility and SEO structure
• Pair with the CSS minifier when optimizing full page assets for production
• Document HTML formatting standards in your team's frontend style guide

Frequently Asked Questions