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Free developer tool

HTML Formatter & Viewer

Turn messy HTML into clean, readable code in seconds. Paste your raw markup on the left and watch it format automatically, ready to copy and reuse.

Working field

Paste raw HTML to format it instantly.

Result

Your formatted HTML appears here.

Your formatted HTML will show here once you paste raw code in the input field.

This tool is best for tidying up HTML, spotting nesting issues, and keeping code readable.

HTML Formatter & Viewer — Clean Up and Read Your HTML Code Instantly

Reformat raw, unorganized HTML into a clean, structured layout with consistent indentation and spacing. This tool keeps the workflow simple: paste and format on the left, supporting content below, and the sidebar on the left for popular and related tools.

Instant formatting

Paste raw HTML and see it reformatted live with clean indentation and tidy nesting.

Easier to read

Consistent spacing helps you understand structure, debug faster, and maintain code.

One-click copy

Grab the formatted output with a single button so you can reuse it right away.

Private by design

Everything runs in your browser, so your HTML never leaves your device.

How it works

  1. Paste your raw HTML code into the input field above.
  2. The tool formats it automatically as you type, with 2-space indentation.
  3. Review the clean, structured output in the panel on the right.
  4. Click Copy Formatted HTML to use the tidy code in your project.

Best practices

  • Paste complete HTML so tags open and close correctly.
  • Format your code before committing it for cleaner diffs.
  • Validate first if the output will not indent properly.
  • Use formatted output to spot unclosed or misplaced tags.
  • Keep indentation consistent across your project files.
  • Convert Markdown to HTML first, then format the result here.

Frequently asked questions

Can this tool fix broken HTML?

No. It formats your HTML as-is to make it readable. To find and fix errors in your code structure, use the Online HTML Validator tool instead.

Is my HTML data stored or shared?

No. All processing is done 100% locally in your browser, so your code never leaves your device, keeping your work completely private.

How can I convert Markdown to HTML?

You can easily convert your files with the Markdown to HTML Converter tool, then paste the result here for clean viewing and formatting.

Does this tool support inline CSS?

Yes. It formats tags that contain inline styles, though it mainly focuses on the structural indentation of the HTML tags themselves.

Is there a limit on the amount of code I can format?

There is no strict limit. For extremely large files, though, your browser's performance will determine how fast the formatting runs.

Can I use this tool on my mobile phone?

Yes. The HTML Formatter & Viewer is fully responsive and works smoothly on smartphones, tablets, and desktop browsers.

Does it validate my HTML code for SEO?

This tool is for formatting and viewing. For SEO validation and error checking, please use the Online HTML Validator tool.

Why is my HTML code not indenting?

This usually happens when the HTML is severely malformed. Try running it through a validator first to confirm your tags are opened and closed correctly.

Does it support HTML5 tags?

Yes. It fully supports all modern HTML5 tags, including <article>, <section>, <nav>, and others.

Is any software installation required?

No. This is a fully web-based utility you can use directly in your browser, with no plugins or extensions needed.

Want to improve your coding workflow? Use the Online HTML Validator tool for a deep technical check, or the Markdown to HTML Converter tool to turn Markdown into clean HTML.