HTML Formatter

Format or minify HTML markup with configurable indentation, attribute wrapping, and comment preservation.

For this tool, processing runs locally in your browser and data is not sent to the server.

HTML Formatter is a free online tool that adds line breaks and indentation to HTML markup, making it easy to read and edit. It is useful for minified HTML, CMS fragments, email templates, SSR output, landing pages, and widgets. The tool runs in your browser and does not send data to the server.

What it does

Output

Processing

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Data passed between tools is kept only in the current browser session.

How to use

Paste HTML markup, a template, CMS fragment, email block, or minified HTML.
Choose a mode: format with indentation or minify.
Configure indent size, attribute wrapping, comment preservation, and handling of script, style, pre, code, and textarea elements.
Copy the result and review warnings if the markup contains complex template syntax or unclosed tags.

More about this tool

HTML Formatter adds line breaks and indentation to HTML markup for readability. The tool is useful for minified HTML, CMS fragments, email templates, SSR output, landing pages, widget HTML, and UI template snippets.

You can choose 2 or 4 space, or tab indentation, wrap long attribute lists onto new lines, preserve comments, and skip re-indenting the contents of pre, code, textarea, script, and style elements. The service formats markup but does not fix tag semantics, accessibility, SEO issues, or replace a W3C validator.

All processing is done locally in the browser. Your data is not sent to the server.

Runs in the browser
Data is not sent to the server
Formats HTML with indentation
Can minify HTML
Supports attribute wrapping
Preserves comments, script/style, and pre/code elements
Useful for CMS, email templates, SSR, and minified markup
No registration required

Frequently Asked Questions

What does the HTML Formatter do?

It adds line breaks and indentation to HTML markup so the code is easier to read, review, and edit.

Can HTML be minified?

Yes. In minify mode the tool removes insignificant whitespace and line breaks between tags but does not alter text values where it would affect rendering.

Does the tool fix HTML errors?

No. The tool formats the markup but does not correct semantic errors, unclosed tags, accessibility issues, or SEO problems.

Are script and style contents formatted?

By default, the contents of script and style blocks are preserved as-is to avoid breaking inline JavaScript or CSS.

Are HTML comments preserved?

Yes, when comment preservation is enabled. Comments can optionally be stripped from the output.

What happens to pre, code, and textarea elements?

Their contents are preserved without re-indentation to avoid breaking whitespace-significant code and form content.

Is the tool suitable for email templates?

Yes. Email HTML often arrives as a minified block. The formatter can make it readable for editing without altering the markup.

Does the tool validate HTML?

No. For semantic and structural validation, use the W3C HTML validator or a dedicated linter.

Is my data sent to the server?

No. HTML is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.

How to use

Paste HTML markup, a template, CMS fragment, email block, or minified HTML.

Choose a mode: format with indentation or minify.

Configure indent size, attribute wrapping, comment preservation, and handling of script, style, pre, code, and textarea elements.

Copy the result and review warnings if the markup contains complex template syntax or unclosed tags.

More about this tool

All processing is done locally in the browser. Your data is not sent to the server.

Runs in the browser
Data is not sent to the server
Formats HTML with indentation
Can minify HTML
Supports attribute wrapping
Preserves comments, script/style, and pre/code elements
Useful for CMS, email templates, SSR, and minified markup
No registration required

Frequently Asked Questions

What does the HTML Formatter do?

It adds line breaks and indentation to HTML markup so the code is easier to read, review, and edit.

Can HTML be minified?

Yes. In minify mode the tool removes insignificant whitespace and line breaks between tags but does not alter text values where it would affect rendering.

Does the tool fix HTML errors?

No. The tool formats the markup but does not correct semantic errors, unclosed tags, accessibility issues, or SEO problems.

Are script and style contents formatted?

By default, the contents of script and style blocks are preserved as-is to avoid breaking inline JavaScript or CSS.

Are HTML comments preserved?

Yes, when comment preservation is enabled. Comments can optionally be stripped from the output.

What happens to pre, code, and textarea elements?

Their contents are preserved without re-indentation to avoid breaking whitespace-significant code and form content.

Is the tool suitable for email templates?

Yes. Email HTML often arrives as a minified block. The formatter can make it readable for editing without altering the markup.

Does the tool validate HTML?

No. For semantic and structural validation, use the W3C HTML validator or a dedicated linter.

Is my data sent to the server?

No. HTML is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.