Does the beautifier send my HTML to a server?

No. All formatting is performed entirely in your browser using JavaScript string processing. Your HTML code never leaves your device.

What is the difference between beautify and minify?

Beautify adds indentation and line breaks to make code readable by humans. Minify removes all unnecessary whitespace to reduce file size: useful for production HTML served to end users.

Does the formatter handle void elements like br and img?

Yes. Void elements (br, hr, img, input, meta, link, etc.) are treated correctly: no closing tag is added and indentation is not increased after them.

Will the beautifier break my JavaScript or CSS inside the HTML?

The formatter handles tag boundaries but does not parse inline script or style content. Embedded JavaScript or CSS is preserved as-is without reformatting.

Can I use it to format HTML email templates?

Yes. Paste your email HTML and use the beautify mode to make it readable for debugging. Use minify mode to reduce the size before sending.

What happens to HTML comments?

In minify mode, HTML comments are stripped. In beautify mode, comments are preserved and placed on their own indented line.

Is there a file size limit?

There is no hard limit: the tool processes everything in your browser's memory. Files under a few hundred kilobytes format instantly. Very large files may take a second or two.

Does it support HTML5 custom elements?

Custom elements (like my-component) are treated as block-level elements by default, which means they get their own line and increase indentation depth.

Can I format partial HTML snippets, not full pages?

Yes. You can paste any fragment of HTML: a single div, a form, or a navigation block: and it will be formatted correctly without needing a full document structure.

HTML Beautifier

Format messy HTML with proper indentation, or minify it for production.

Indent:

InputN/A

Output

Output will appear here

About this tool

HTML formatting runs entirely in your browser using pure JavaScript: no server, no uploads. The beautifier handles nested tags, void/self-closing elements, and inline element grouping.

Format HTML online: instant beautifier with proper indentation

AlteredIdea's HTML Beautifier takes minified or unindented HTML and instantly transforms it into well-formatted code with consistent nesting, correct handling of void elements, and intelligent inline element grouping. Paste anything from a raw API response to a bundled production file and get readable output in milliseconds.

Because the formatter runs entirely in your browser, sensitive HTML: internal dashboards, email templates with customer data, proprietary component structures: never reaches a server. There is no account required, no rate limiting, and no tracking of the content you paste.

The minify mode is equally useful: strip all unnecessary whitespace before deploying to reduce HTML payload size. The tool reports original and result sizes so you can see exactly how much bandwidth you are saving.

How to format HTML online: step by step

1
Paste your HTML
Copy any HTML: a snippet, a full page, an email template: and paste it into the Input panel.
2
Choose Beautify or Minify
Select Beautify to add proper indentation and line breaks, or Minify to strip whitespace for production deployment.
3
Set indent size
Choose 2 or 4 spaces to match your team's coding style guide.
4
Review the formatted output
The output panel shows the result with correct nesting for block elements, void tags, and inline element grouping.
5
Copy and use
Click Copy to send the formatted HTML to your clipboard. Paste it back into your editor, email client, or CMS.

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Frequently Asked Questions

Does the beautifier send my HTML to a server?: No. All formatting is performed entirely in your browser using JavaScript string processing. Your HTML code never leaves your device.
What is the difference between beautify and minify?: Beautify adds indentation and line breaks to make code readable by humans. Minify removes all unnecessary whitespace to reduce file size: useful for production HTML served to end users.
Does the formatter handle void elements like br and img?: Yes. Void elements (br, hr, img, input, meta, link, etc.) are treated correctly: no closing tag is added and indentation is not increased after them.
Will the beautifier break my JavaScript or CSS inside the HTML?: The formatter handles tag boundaries but does not parse inline script or style content. Embedded JavaScript or CSS is preserved as-is without reformatting.
Can I use it to format HTML email templates?: Yes. Paste your email HTML and use the beautify mode to make it readable for debugging. Use minify mode to reduce the size before sending.
What happens to HTML comments?: In minify mode, HTML comments are stripped. In beautify mode, comments are preserved and placed on their own indented line.
Is there a file size limit?: There is no hard limit: the tool processes everything in your browser's memory. Files under a few hundred kilobytes format instantly. Very large files may take a second or two.
Does it support HTML5 custom elements?: Custom elements (like my-component) are treated as block-level elements by default, which means they get their own line and increase indentation depth.
Can I format partial HTML snippets, not full pages?: Yes. You can paste any fragment of HTML: a single div, a form, or a navigation block: and it will be formatted correctly without needing a full document structure.

AlteredIdea vs alternatives

vs online HTML beautifiers: Most online HTML formatters send your code to their server. AlteredIdea formats entirely client-side, keeping proprietary or sensitive HTML private.

vs VS Code / Prettier: VS Code with Prettier requires installing Node.js, a project, and the extension. AlteredIdea works in any browser tab: no install, no config file.

vs paid tools: Completely free with no account, no API key, and no usage limits. Format as many HTML files as you need.

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