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HTML Formatter online

Format, prettify or minify HTML — all in your browser

HTML Formatter & Minifier logo
by
CHUNKY
MUNSTER
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How to Use html-formatter

  1. Paste minified or poorly-formatted HTML into the input area.
  2. Click Prettify to indent nested elements and add consistent line breaks.
  3. Switch to Minify to strip all whitespace and comments.
  4. Configure indentation size (2 or 4 spaces) and self-closing tag style in the options.

Well-formatted HTML is readable, maintainable, and easier to debug. Minified HTML reduces page weight by removing whitespace the browser ignores. This formatter handles both directions — pretty-printing for readability during development and minification for production — with correct handling of inline elements, pre-formatted blocks, and void elements.

Prettify vs Minify Trade-offs

Pretty-printed HTML expands code by 20–40% compared to minified, but becomes readable and maintainable. Minified HTML saves bandwidth (combined with gzip, the savings are usually 5–15% over already-compressed traffic). The most important HTML performance consideration is not minification but rather: reducing DOM complexity, eliminating render-blocking scripts and CSS, and optimising critical rendering path. Minification is a minor final-mile optimisation.

Frequently Asked Questions

Does minifying HTML improve SEO?

Marginally at most. Page speed is a Google ranking signal, and faster load time helps. However, minification saves only a few KB on typical pages — the impact on Core Web Vitals is minimal compared to image optimisation, code splitting, and caching.

Why doesn't the formatter reformat content inside 
 tags?

<pre> marks preformatted text where whitespace is significant — poems, code samples, ASCII art. Reformatting inside would change the visual output. The formatter treats <pre> content as opaque and preserves it exactly.

Can I format HTML from a CDN link?

Use the URL Fetch option (if available) to load a URL's HTML directly into the formatter. Otherwise, view-source the page in your browser (Ctrl+U) and copy the raw HTML.

What is the difference between HTML and XHTML formatting?

XHTML requires all void elements to be self-closing (<br /> not <br>) and all attributes to be quoted. HTML5 is more permissive. The formatter offers both modes to produce correct output for your target document type.

See also the CSS Minifier, JSON Formatter, and the Diff Checker.