Online HTML Prettify

What is an HTML Prettify?

I created this HTML Prettify tool to turn messy one-line markup into clear, readable HTML. When you paste raw or compressed HTML into the input box you will instantly see a neatly indented structure. .

What Does Our HTML Prettify Do?

When you click the Prettify HTML button the script splits tags, adds line breaks, and indents nested elements automatically. You will see opening tags, content, and closing tags aligned in a way that reveals the document hierarchy. There is no server call and no dependencies—every step happens on your device.

What to Expect When Using This Tool

On load you will see two text areas side by side labeled HTML Input and Formatted Output. On wide screens they sit in columns, on narrow screens they stack vertically. Paste your HTML into the left field, click Prettify HTML, and inspect the indented result on the right. Clear All resets both fields so you can start fresh.

Common Use Cases

• Cleaning up exported HTML from WYSIWYG editors
• Preparing template code for reviews
• Beautifying snippets before sharing in documentation
• Simplifying nested structures for debugging
• Ensuring consistent formatting across a project

Input and Output Examples

Example 1

Input:

<div><h1>Title</h1><p>This is a paragraph.</p></div>

Output:

<div>
  <h1>
    Title
  </h1>
  <p>
    This is a paragraph.
  </p>
</div>

Example 2

Input:

<ul><li>First</li><li>Second</li><ul><li>First</li><li>Second</li></ul></ul>

Output:

<ul>
  <li>First</li>
  <li>Second</li>
  <ul>
    <li>First</li>
    <li>Second</li>
  </ul>
</ul>

Frequently Asked Questions (FAQs)

What if my markup is invalid?

The tool will still insert line breaks and indentation. It does not validate HTML syntax.

Will it change my content?

It only adds whitespace for readability. Text and tags remain unchanged.

Can I use this on mobile?

Yes the interface is responsive and works on phones and tablets.

Do I need an internet connection?

No connection is needed. Everything runs locally in your browser.

Can I adjust the indent size?

At present the tool uses two spaces per level and does not allow customization.

Does it support inline scripts?

Yes it will indent script and style blocks just like other tags.

Can I paste large documents?

The tool handles moderate size documents but performance may vary by device.

How do I copy the formatted code?

Select the output text area and use your browser copy command.

Is the code open source?

You can view the HTML in your page source to inspect the full script.

Benefits of Using Formatted HTML

• Improved readability for debugging
• Faster code reviews
• Consistent project formatting
• Easier identification of nested elements
• Cleaner documentation snippets

Best Practices

• Keep a prettified copy for development
• Minify for production only after review
• Use consistent indent size across your team
• Validate syntax separately with an HTML validator
• Integrate formatting into your workflow

Getting Started

1. Paste your raw HTML into the HTML Input box
2. Click the Prettify HTML button
3. Copy the indented result from the Formatted Output box
4. Click Clear All to reset the fields
5. Use the formatted code in your project or documentation
6. Enjoy cleaner and more maintainable HTML!