HTML Formatter – Format & Beautify HTML Online

How to Use the Online HTML Formatter

Paste Your HTML Source: Enter any unformatted, single-line, or messy HTML document into the left editor pane.
Select Indentation: Choose 2 spaces (standard web convention), 4 spaces, or Tab characters.
Click "Format HTML": The parser decomposes document tags, indents nested sections, and aligns void elements cleanly.
Inspect the Output: Review the clean, readable markup hierarchy in the right output panel.
Copy or Download: Use "Copy" to transfer beautified code to your clipboard or "Download" to export formatted.html.

What Is an HTML Formatter?

An HTML Formatter (often referred to as an HTML Beautifier or Pretty Printer) takes unformatted, minified, or disorganized HyperText Markup Language and reconstructs it with clean hierarchical indentation and line breaks.

Modern web development involves inspecting server-rendered pages, email templates, and scraped web data where markup is compressed into single unreadable strings. CodeCrate's HTML Formatter restores structural clarity instantly, helping engineers identify unclosed tags, understand DOM nesting, and conduct thorough code reviews.

Before & After Example

Unformatted / Single-Line HTML

<!DOCTYPE html><html lang="en"><head><title>Cart</title></head><body><main class="checkout"><h1>Order Summary</h1><table><tr><th>Item</th><th>Price</th></tr><tr><td>Pro Plan</td><td>$29</td></tr></table><button class="btn-pay">Pay Now</button></main></body></html>

Dense single-line markup that is difficult to edit or review.

Formatted & Beautified HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Cart</title>
  </head>
  <body>
    <main class="checkout">
      <h1>Order Summary</h1>
      <table>
        <tr>
          <th>Item</th>
          <th>Price</th>
        </tr>
        <tr>
          <td>Pro Plan</td>
          <td>$29</td>
        </tr>
      </table>
      <button class="btn-pay">Pay Now</button>
    </main>
  </body>
</html>

Clean, properly indented document tree with readable hierarchy.

Key Features of CodeCrate HTML Formatter

Strict Security Isolation: Pasted HTML is treated purely as inert text. Script tags, inline event handlers (onload, onerror), and iframes are never executed or rendered into the active webpage.
HTML5 Void Element Awareness: Accurately handles self-closing and void tags (<img>, <input>, <meta>, <link>, <br>) without breaking tree indentation.
Doctype and Comment Preservation: Maintains standard <!DOCTYPE html> declarations and HTML comments intact.
Custom Elements & Data Attributes: Fully supports modern Web Components (custom elements with hyphens) and dataset properties (data-*).
Instant Export: Download formatted markup directly as formatted.html or copy to your clipboard with confirmation feedback.

Common Developer Use Cases

Debugging Web Scraping Output

Reformat raw HTML responses extracted using Puppeteer, Cheerio, BeautifulSoup, or curl to inspect page structure and CSS selectors.

Email Newsletter Templating

Format dense nested tables and inline styles in HTML email templates before testing compatibility across Outlook and Gmail.

Server-Side Rendered (SSR) Views

Format unindented template engine outputs from EJS, Handlebars, Blade, Pug, or Jinja2 to verify HTML hierarchy.

Git Pull Request Audits

Standardize HTML indentation before committing static pages to prevent giant git whitespace diffs.

Technical Notes on HTML Parsing & Security

Formatting vs Live Rendering: Many dangerous online beautifiers insert user markup directly into an <iframe> or manipulate innerHTML to format tags. This introduces severe Cross-Site Scripting (XSS) risks if the markup contains tracking pixels, malicious scripts, or clickjacking payloads. CodeCrate parses markup strictly using a non-executing string tokenizer.

Void Tags vs Normal Tags: In HTML5, void elements cannot have child nodes and must not have closing tags. Our formatter maintains a strict registry of void elements so that tags like <input type="text"> do not inadvertently indent subsequent sibling elements.

Preserving Text Nodes: Text content within paragraph tags (<p>), anchor links (<a>), and heading elements is preserved with normalized spacing to ensure readability without causing unexpected layout shifts.

Frequently Asked Questions

Does CodeCrate execute or render user HTML as a live page?

Never. Input is treated strictly as inert code/text. Script tags, iframes, inline event handlers, and web components are never executed or rendered as live DOM elements.

How does the formatter handle void elements like img and input?

The formatter recognizes standard HTML5 void elements (such as img, input, br, hr, meta, and link) and formats them without erroneously increasing block indentation depth.

What indentation options are supported?

You can select 2 Spaces (default), 4 Spaces, or Tab characters to align with your project's ESLint, Prettier, or HTMLStyle guidelines.

Are embedded script and style tags formatted?

Yes. Embedded JavaScript blocks and inline CSS stylesheets are preserved as text within their parent tags and indented cleanly.

Can I download my formatted HTML document?

Yes. Click Download to save the beautified markup directly as formatted.html or copy it to your clipboard with one click.

Is my HTML code sent to a remote server?

No. All formatting is executed 100% locally in your web browser. Proprietary web templates and markup stay strictly confidential.