HTML Formatter
Format and beautify HTML with proper indentation and tag nesting. Minify HTML to reduce file size. Free online tool, 100% in your browser.
Reference
What is HTML formatting?
HTML formatting applies consistent indentation and line breaks to HTML markup so that the nesting structure of elements is visually clear. Each child element is indented one level deeper than its parent, block-level tags start on new lines, and attributes are aligned for readability. Well-formatted HTML makes it easier to spot unclosed tags, mismatched nesting, and structural issues. This tool parses your HTML and re-indents it according to the selected indent size, handling self-closing tags, inline elements, and nested structures correctly.
HTML elements and nesting
HTML documents are built from nested elements: block-level elements (<div>, <section>, <article>, <header>, <footer>, <main>, <nav>) define the page structure, while inline elements (<span>, <a>, <strong>, <em>, <code>) style content within blocks. Void elements (<img>, <br>, <hr>, <input>, <meta>) have no closing tag. Proper indentation makes the parent-child hierarchy immediately visible, which is critical for maintaining complex templates and component markup.
Privacy
All formatting runs 100% in your browser. No HTML data is sent to any server.