Beautify HTML Online — Format & Indent Markup
Properly nested indentation for markup — including the embedded CSS and JS.
🔒 Runs in your browser — files never uploaded ⚡ No signup 💯 Free
Format HTML with indentation that follows the element tree — and because the full js-beautify family is loaded, embedded <style> and <script> blocks get formatted as CSS and JavaScript rather than treated as opaque text.
Minified pages, template output, copy-pasted fragments from anywhere — all become markup you can actually see the structure of.
How to use HTML Beautifier
- Paste HTML — a fragment or a whole page.
- Pick your indent style.
- Click Beautify. Embedded CSS and JS format along with the markup.
- Copy or download as an .html file.
Why indentation mirrors nesting
HTML's meaning is its tree — misreading which div closes where is the source of half of all layout confusion. Indentation that tracks the tree makes mismatched tags and wrongly nested elements visually obvious, which is why beautifying a page is often the fastest way to find the unclosed tag that's breaking it.
A note on whitespace changes
Formatting HTML can change rendering in whitespace-sensitive inline contexts — the dual of the minifier's caution. The formatter is careful with <pre> and friends, but if a pixel-perfect inline layout depends on exact spacing between elements, diff the rendered result. For documents and templates — the normal case — formatting is visually lossless.
Related
Ship it back compact with the HTML minifier; for the markup's meaning, the meta tag generator covers the head section's SEO side.
Frequently asked questions
Does it format the CSS and JavaScript inside my HTML?
Yes — <style> blocks format as CSS and <script> blocks as JavaScript, each with proper indentation inside the surrounding markup. That's why this page loads all three formatters.
Can formatting HTML change how the page renders?
In whitespace-sensitive inline layouts, marginally, yes — HTML is the one language where whitespace between elements can render. Documents and templates format losslessly in practice; a pixel-tuned inline widget deserves a visual check after.
Will it fix my unclosed tags?
No — it formats what's there rather than repairing it. But it makes unclosed tags visible: when the indentation marches steadily rightward and never comes back, the tag that never closed is right where the drift starts.
What indent do people actually use for HTML?
Two spaces is the dominant convention (HTML nests deeply, and four-space indents push real content off the right edge). Tabs are the accessibility-friendly choice — readers can set their own width. Pick per project and stay consistent.