How to use the HTML formatter
- Paste your HTML into the input box: a full page, a template or a fragment copied from your browser's developer tools.
- Click Beautify to indent the markup so each nested element sits on its own line.
- Click Minify to strip comments and unnecessary whitespace for a smaller file.
- Copy the result back into your editor or CMS.
The formatter works entirely in your browser. Your markup is not uploaded or stored, and it is treated as text: nothing you paste is executed.
Why format HTML?
HTML produced by page builders, email editors, CMS exports and build tools is often minified or badly indented. That is fine for browsers, but it makes the structure hard for people to follow. Beautified HTML shows the document tree clearly, so you can see which <div> closes where, find a misplaced element, and review changes in a diff.
Minification works the other way round. Removing comments, indentation and line breaks makes the file smaller, which slightly reduces transfer size. On most sites server compression (gzip or Brotli) already shrinks HTML considerably, so minifying gives a smaller extra gain, but it is still common in production builds.
Common HTML problems and how to fix them
Browsers are forgiving: the HTML parsing algorithm recovers from most errors instead of failing. That is convenient, but it means broken markup often renders "almost right" and causes confusing layout bugs. Beautifying makes these problems easier to see.
Unclosed elements. When indentation keeps drifting to the right and never comes back, an element was probably not closed:
<div class="card">
<div class="card-body">
<p>Hello
</div>The single </div> closes card-body (and implicitly ends the paragraph), so the outer card stays open and swallows everything that follows. Close every element explicitly:
<div class="card">
<div class="card-body">
<p>Hello</p>
</div>
</div>Block elements inside inline ones or inside <p>. A <div> inside a <p> is not allowed: the browser closes the paragraph early, and your CSS stops matching as expected.
Misnested tags. <b><i>text</b></i> should be <b><i>text</i></b>. Inner elements must close before outer ones.
Duplicate IDs. An id must be unique in the document. Duplicates break getElementById, label associations and in-page anchors.
Void elements and whitespace
Some elements can never have content and have no closing tag. These void elements are:
| Void elements |
|---|
area, base, br, col, embed, hr, img, input, link, meta, source, track, wbr |
In HTML, <br> and <br /> are equivalent; the trailing slash is optional. Writing </br> or <img></img> is an error.
Whitespace between inline elements can be visible. Two inline-block buttons separated by a line break show a small gap, while the same buttons on one line do not. A good formatter preserves the content of <pre> and <textarea> exactly, but if layout changes slightly after beautifying or minifying, inline whitespace is the usual cause.
Tips and best practices
- Indent with two spaces; deeply nested HTML becomes very wide with four.
- Keep large inline
<style>and<script>blocks in separate files, and tidy them with the CSS formatter and JavaScript formatter. - Minify as part of your build, not by hand, so the readable source stays in version control.
- After deploying, check the page's on-page SEO with the SEO checker and its load time with the website speed test.
Frequently asked questions
Does beautifying change how my page looks?
Usually not. Adding indentation between block elements has no visible effect. Whitespace between inline elements can create or remove small gaps, so check pages with tight inline layouts after formatting.
Is this an HTML validator?
No. It re-indents and minifies markup but does not check it against the HTML specification. Formatting does, however, make many structural errors easy to spot by eye.
Is minified HTML better for SEO?
Search engines read minified and formatted HTML equally well. Minifying can make pages slightly smaller, which helps performance a little, but content, structure and speed matter far more than whitespace.
Can I format HTML email templates?
Yes. Email HTML often relies on nested tables and inline styles, and beautifying makes it much easier to edit. Test the result in your email platform afterwards, since some email clients are sensitive to whitespace.