HTML Beautifier
Format and beautify HTML code
Formateador HTML
Formatea tu HTML añadiendo indentación y saltos de línea para mejorar la legibilidad del código.
Online HTML Beautifier - Format and Organise HTML Code
Why does correctly formatted HTML matter?
Badly formatted HTML causes a string of problems: unclosed elements are hard to spot, the DOM structure is invisible, finding the right place to insert new code becomes tedious, and nesting mistakes slip through unnoticed. Well indented HTML shows the element hierarchy clearly: what sits inside what, where each container opens and closes, and how elements relate. That speeds up development, simplifies debugging, improves team collaboration and reduces bugs. Readable code is maintainable code.
HTML indentation and formatting rules
Standard HTML formatting follows a few rules: every block element (div, section, article, header, main, footer, nav, aside, ul, ol, table) starts on a new line indented to its nesting level; inline elements such as span, a, strong and em can stay on the same line when they are short; very long attribute lists are split across several lines; comments are preserved and aligned; short text content stays next to its tag; and void elements such as img, br, input and meta need no closing tag. Consistency in the spacing unit, whether 2 spaces, 4 spaces or tabs, matters more than the specific number.
Use cases for the HTML beautifier
This tool earns its place in several situations: cleaning up HTML pasted from WYSIWYG editors that emit messy markup, expanding minified production HTML for debugging, tidying templates handed over by designers, preparing code for review, standardising style across a legacy project, and formatting HTML captured from APIs or web scraping. It is also a learning aid: seeing well structured HTML teaches good semantic markup and document architecture.
If you work with this tool, you will probably also find these useful HTML Encoder, Meta Tags Generator, JSON Formatter, YAML/JSON Converter.
Frequently asked questions
Does the formatter fix HTML errors?
No. This tool formats by adding indentation and line breaks, but it does not validate or repair HTML. Unclosed tags or invalid nesting will still be there in the output. For validation, use the W3C Markup Validation Service, although formatting often makes it much easier to see where the errors are.
Does it preserve HTML comments?
Yes, comments are kept and indented according to their position in the structure. Comments carry documentation value and should not be stripped during formatting. If you want to remove comments for production, use a dedicated minifier instead.
Does it work with HTML5, XHTML and framework templates?
Yes, it handles standard HTML5 including semantic elements such as article, section and nav, as well as XHTML. Template syntax from Angular, Vue or React JSX is formatted too, though binding expressions may need manual adjustment depending on how complex they are.
Why is my inline HTML split across several lines?
The formatter prioritises structural clarity, so elements that are semantically blocks are formatted as blocks. If you need specific elements kept inline, adjust them manually afterwards or use a tool with finer configuration, such as Prettier with its HTML-specific options.