HTML Beautifier
Format and beautify messy HTML code with our free online HTML Beautifier. Transform minified, unformatted, or poorly structured HTML into clean, properly indented, and readable code. This essential developer tool automatically adds consistent indentation, line breaks, and spacing to make your HTML markup easy to read and maintain. Whether you are debugging third-party HTML, cleaning up generator output, reviewing someone else's code, or preparing HTML for documentation, this beautifier saves time and reduces errors. The tool handles HTML5, XHTML, and embedded CSS/JavaScript with customizable formatting options.
What Is
The HTML Beautifier is a code formatting tool that takes unformatted or minified HTML source code and outputs cleanly formatted, properly indented markup. It parses the HTML document structure and applies consistent formatting rules including indentation (configurable as tabs or spaces with adjustable width), line breaks between block-level elements, inline element handling, attribute formatting with options for single-line or multi-line attribute layout, and preservation of content within pre, textarea, and script tags. The tool understands HTML5 semantic elements, handles self-closing tags correctly, maintains proper nesting hierarchy with visual indentation, and preserves comments with configurable formatting. It supports inline CSS and JavaScript formatting within style and script tags respectively. The beautifier can handle documents of any size and provides options for wrapping line length and force-indenting inline elements.
How to Use
- Open the HTML Beautifier in your browser — no installation or account needed.
- Paste your unformatted or minified HTML code into the input area, or upload an HTML file.
- Configure formatting options: choose indentation style (tabs or spaces), indent size, and maximum line length.
- Select any additional options such as formatting inline CSS/JS, preserving comments, or wrapping attributes.
- Click the Beautify button — your HTML will be instantly formatted with proper indentation and spacing.
- Copy the formatted output or download it as an HTML file.
Examples
Input: HTML: <div><p>Hello</p><span>World</span></div>
Process: Parse DOM tree → Apply indentation (2 spaces per level) → Pretty print
Result: <div>\n <p>Hello</p>\n <span>World</span>\n</div>
Input: Minified: <ul><li>A</li><li>B</li><li>C</li></ul>
Process: Detect nesting depth → Add proper newlines + indentation
Result: <ul>\n <li>A</li>\n <li>B</li>\n <li>C</li>\n</ul>
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Frequently Asked Questions
Is the HTML Beautifier free?
Yes, this tool is completely free to use with no file size limits, no account required, and no premium features. You can beautify unlimited HTML documents with full access to all formatting options. All processing happens locally in your browser for complete privacy.
Does it handle HTML5 elements?
Yes, the beautifier fully supports HTML5 semantic elements including article, section, nav, aside, header, footer, main, figure, figcaption, details, summary, and time. It correctly identifies block-level and inline elements and applies appropriate formatting rules based on the HTML5 specification.
Can it format CSS and JavaScript inside HTML?
Yes, the beautifier includes optional inline CSS and JavaScript formatting. When enabled, CSS within style tags and JavaScript within script tags will be formatted using the respective beautifiers for those languages. This provides a complete formatting solution for HTML files containing embedded styles and scripts.
Will it change my HTML structure or content?
No, the beautifier only changes whitespace (indentation, line breaks, spacing) and does not alter the HTML structure, attributes, or content. The formatted output is functionally identical to the input — it only looks different. All tags, attributes, attribute values, and text content remain unchanged.
What about malformed or broken HTML?
The beautifier uses a lenient parser that can handle many common HTML issues such as missing closing tags, improperly nested elements, and unclosed attributes. It will attempt to produce the best possible formatting even for imperfect markup. However, severely broken HTML may produce unexpected results — it is recommended to validate HTML before formatting.
Can I configure the output format?
Yes, you can configure indentation character (tabs vs spaces), indent size (2, 4, or 8 spaces), maximum line length for wrapping, whether to indent braces for inline CSS/JS, how to handle attributes (single line vs multi-line), and whether to preserve blank lines from the source.