HTML Formatter & Preview
Paste HTML to beautify it with clean indentation or minify it to a single line, and see a live preview rendered in a sandboxed frame. Handles void tags, comments, and preserves <pre>/<script>/<style> content — all in your browser.
About this tool
HTML Formatter & Preview beautifies tangled HTML into neatly indented markup, or minifies it down to a single line, and shows a live preview rendered in a sandboxed frame so you can see the result immediately.
It understands the awkward parts of HTML — void tags like line breaks and images, comments, and the raw content inside pre, script and style blocks that must not be reformatted. That makes it a reliable way to clean up copied snippets, email templates or generated markup, all without leaving your browser.
How to use
- Paste your HTML into the input box.
- Click Format to apply clean, consistent indentation.
- Use Minify to collapse the markup into a single compact line.
- Open the live preview to see how the HTML renders.
- Copy the formatted or minified HTML to your clipboard.
Features
- Beautify HTML with readable indentation.
- Minify HTML to a single line to reduce size.
- Live preview rendered in a sandboxed iframe.
- Handles void tags and comments correctly.
- Preserves the content of pre, script and style blocks.
- Everything runs in the browser — your markup is never uploaded.
Frequently asked questions
Is my HTML uploaded to a server?
No. Formatting, minifying and the preview all run in your browser, so your markup — and anything it contains — stays entirely on your device.
Is the live preview safe to use?
The preview renders inside a sandboxed iframe, which isolates it from the rest of the page. Even so, only preview HTML you trust, since it will execute like a normal web page.
Will formatting mangle my scripts or preformatted text?
No. The content inside pre, script and style blocks is preserved as-is, because reindenting those blocks could change how they behave or display.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks so the HTML is easy to read and edit, while minify strips whitespace to make the file smaller for faster loading.