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About this HTML Beautifier Online HTML Beautifier

Got a block of unreadable, minified HTML? Paste it here and turn it into clean, well-indented markup in one click ✨. This HTML beautifier runs 100% in your browser, uses a Prettier-style formatter under the hood, and is tuned for HTML5 documents, partial snippets, and template-driven output.

Key Features of This HTML Beautifier

  • One-click beautify: re-indent and reflow HTML for readability
  • Works with full documents and small snippets (components, fragments, partials)
  • Custom indentation: spaces or tabs, 1–8 characters deep (matches the tool settings)
  • Optional soft wrap via line-length hint, ideal for version control diffs
  • Whitespace-aware: respects sensitive blocks like <pre> and code in most common cases
  • Keeps doctype, comments and meta/SEO tags intact while reformatting structure
  • File support for .html, .htm and .xhtml up to ~5 MB (with a 2 MB text safety guard)
  • 100% client-side processing – HTML is never uploaded to a server

🔧 How to Beautify HTML (Step-by-Step) for html-beautifier

1

Paste or Drop HTML

Paste your HTML into the editor on the left, or drag & drop an .html / .htm file from your project. The tool accepts full HTML5 documents or partial fragments.

2

Choose Formatting Options

Pick your indentation style (spaces or tabs) and indent size (1–8). You can also adjust the preferred line length to keep code tidy for Git diffs.

3

Beautify the Markup

Run the formatter. The tool parses your HTML and reprints it with consistent indentation, line breaks, and spacing while preserving semantic structure.

4

Copy or Save

Copy the formatted HTML back into your editor, or download it as a cleaned .html file. For production compression, you can switch to the Minify mode or use the dedicated HTML Minifier tool.

Technical Specifications

Markup & File Support

The tool is tuned for modern HTML workflows while remaining friendly to legacy markup.

FeatureSupportNotes
HTML5 documents✅ Fulldoctype, head/body, meta/SEO tags preserved
HTML fragments✅ Fullcomponents, partial templates, CMS snippets
XHTML✅ Basictreated as HTML; well-formed markup recommended
Embedded scripts/styles✅ Basiccontent preserved; outer formatting cleaned
Inline SVG/MathML✅ Preservedkeeps structure, normal HTML indentation
Template markers✅ Best-effortmost {{ }}, <% %>, {% %} blocks are kept as text

Formatting Options (Mapped to Tool Settings)

Options line up with the HTML formatter’s configuration panel.

SettingRange / ValuesDefault
Indent styleSpaces / TabsSpaces
Indent size1–82 spaces
Line wrap hint0 (no hint) – 12080 characters
End-of-lineLF (\n) / CRLF (\r\n)LF (\n)
Final output typeFormatted / MinifiedFormatted (Beautify mode)
Max text size~2 MBSafety guard inside the formatter engine

Performance & Limits

Approximate behaviour in modern desktop browsers.

Input SizeExperienceRecommendation
≤ 200 KB⚡ InstantIdeal for day-to-day debugging and reviews
200–1000 KB⚡ FastStill comfortable for interactive editing
1–2 MB⏳ Noticeable pauseOK for occasional use; save often
> 2 MB🚩 Not recommended in the browserPrefer CLI tools for bulk/CI

Command-Line HTML Formatting Alternatives

For large projects, CI pipelines, or very big templates, use local tools and keep this beautifier for quick inspections and ad-hoc debugging.

Linux / 🍏 macOS / 🪟 Windows

Prettier HTML formatting

npx prettier --parser html --write index.html

Uses the same family of formatting rules as many modern editors.

Prettier with 100-character line width

npx prettier --parser html --print-width 100 index.html

Matches a wider line-length hint similar to this online tool.

Linux / 🍏 macOS

tidy-html5 cleanup

tidy -indent -wrap 80 -quiet index.html > index.pretty.html

Classic utility for cleaning legacy or CMS-generated markup.

Practical Use Cases

Debugging & Code Reviews

Make complex HTML easier to read so bugs stand out.

  • Reveal unbalanced tags that were hidden in minified markup.
  • Visually inspect nested layouts, grids, and flexbox containers.
  • Share readable snippets in pull requests, tickets, or documentation.
<!-- Before -->
<section><div><article><h2>Title</h2><p>Text…</p></article></div></section>
<!-- After beautify -->
<section>
  <div>
    <article>
      <h2>Title</h2>
      <p>Text…</p>
    </article>
  </div>
</section>

SEO & Semantics Inspection

Expose structure so you can reason about semantics and SEO markup.

  • Check heading hierarchy (h1 → h2 → h3) after CMS or builder output.
  • Verify placement of meta tags, Open Graph tags and structured data.
  • Quickly scan for duplicate or missing canonical and hreflang tags.

Learning from Existing Pages

Beautify third-party HTML to learn patterns and best practices.

  • Unminify example templates from UI libraries.
  • Study markup produced by static site generators or CMS themes.
  • Teach students how semantic HTML is structured in the wild.

❓ Frequently Asked Questions

Does beautifying HTML change how the page renders?

In normal cases, no. Beautification changes only whitespace and line breaks, plus some spacing around tags and attributes. Browsers treat most extra whitespace the same, so the visual output should remain identical as long as your HTML was valid to begin with.

What is the difference between this HTML Beautifier and the HTML Minifier tool?

This page focuses on readable, developer-friendly output: indentation, line breaks and consistent structure. The dedicated HTML Minifier tool prioritizes file size and performance, aggressively removing whitespace, comments and some optional tags. Use Beautifier while debugging, and Minifier when preparing assets for production.

Can I use this with server-side templates or frameworks?

Yes, for many setups. The formatter generally preserves most template markers (such as {{ }}, <% %>, {% %}) as text. However, very unusual or invalid HTML emitted by some templating engines may not format perfectly. Always preview critical templates before deploying.

Is my HTML code sent to a server or stored anywhere?

No. The beautifier runs entirely in your browser using client-side JavaScript. Your HTML is not uploaded, logged, or shared. For extremely sensitive templates, you can still prefer local CLI tools, but this tool is designed to be privacy-friendly by default.

How large can the HTML input be?

For a smooth interactive experience, the editor caps text input around 2 MB and file uploads around 5 MB. Bigger HTML bundles or whole static-site exports are better processed offline with CLI tools wired into your build pipeline.

Pro Tips

Performance Tip

Use the beautifier on HTML generated by CMSs and page builders to reveal extra wrappers and nested containers that might hurt performance.

Best Practice

Run HTML through a beautifier before committing to Git so future diffs stay small and focused on actual content changes, not random whitespace.

Best Practice

After beautifying, quickly scan headings, landmarks and aria-* attributes to catch easy accessibility wins.

Best Practice

Pair this Beautifier with the HTML Minifier tool: format for development, minify as a final step in your build or deployment pipeline.

Additional Resources

MDN – HTML: HyperText Markup Language
Documentation
WHATWG – HTML Living Standard
Technical specification
Prettier – HTML Formatting Options
Documentation

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