HTML Formatter
Beautify and format HTML code with proper indentation.
Input
Output
Beautify and format HTML code with proper indentation.
This free HTML Formatter from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the HTML Formatter
- Paste your input - JSON, regex pattern, JWT, URL etc.
- Pick any flags or options the tool supports.
- Click the action button (Format, Test, Decode).
- Copy the result or download it as a file.
What you can do with the HTML Formatter
- Format and validate API responses while debugging.
- Test regex patterns against real input before deploying.
- Decode JWTs to inspect claims and expiry.
- Generate UUIDs for migrations, tests and seeders.
Why use KX Toolkit's HTML Formatter
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Bookmark the most-used tools - your browser bookmark bar is faster than retyping the URL every time.
Related Developer Tools
If you find this tool useful, explore the full Developer Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How does the HTML formatter handle inline JavaScript and CSS?
Script and style blocks are formatted with the same indentation as their parent element, and the content inside is reformatted using the matching language rules. Inline event handlers and style attributes are left as-is to avoid breaking expressions. If you need deeper formatting of embedded scripts, run the JavaScript or CSS formatter on those blocks separately.
Does formatting change the rendered output of my page?
For block-level elements, no - extra whitespace between tags is collapsed by the renderer. For inline elements such as span, a, and img, whitespace can become visible spaces between words or icons. The formatter is conservative around inline contexts, but verify visually after running it to catch any spacing changes that affect typography.
Will it preserve my HTML comments and conditional comments?
Yes. Standard comments are kept verbatim and indented with their surrounding markup. Legacy IE conditional comments are also preserved, though they are no longer supported by any current browser. If you find conditional comments in old code, formatting is a good moment to delete them along with any IE-specific shims.
Why does the formatter wrap long attribute lists onto multiple lines?
Long single lines are hard to read and review in pull requests. Most formatters break attributes onto separate lines once a line exceeds the configured print width, typically 80 or 120 characters. The behavior is controlled by tool options if you prefer single-line output. The result is identical HTML; only the source layout changes.
Is it safe to format minified HTML?
Yes, formatting reverses minification by re-adding whitespace and line breaks. The semantic structure is unchanged, so behavior remains identical. The only caveat is that minifiers sometimes remove optional closing tags like </li> or </p>; the formatter typically adds them back, which is harmless but changes the byte count.
What about template syntax like Twig, Blade, or Handlebars?
Pure HTML formatters often mishandle templating delimiters because they look like text rather than markup. Curly braces in Handlebars or Vue interpolations may survive, but block tags such as Twig if-else can be broken across awkward lines. For template files, use a formatter aware of your engine - for example djLint for Django and Jinja or prettier-plugin-blade.
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