// Web / Developer
HTML Prettifier online
Beautify and format HTML with proper indentation
by
CHUNKY
MUNSTER
MUNSTER
HTML Prettifier is a powerful code formatter designed to transform compact or messy markup into readable, well-structured blocks. Prettified HTML is significantly easier to review, diff, and debug than a single minified string. This tool walks your document tree, ensuring that nested elements are correctly indented and attributes are optionally wrapped for maximum clarity. Whether you are preparing a code review or performing view source cleanup, our prettifier ensures your markup remains professional and maintainable.
Modern web development often involves working with generated markup that lacks consistent styling. Our indent html code utility tokenizes your input into tags and text runs, applying a precise depth counter to maintain perfect alignment. Crucially, the algorithm is whitespace-aware, walking past <pre> and <script> blocks byte-for-byte to prevent damage to sensitive content. Using a reliable readable markup formatter is an essential step in maintaining high-quality codebases across distributed teams.
<pre>, <textarea>, <script>, <style> contents<pre> blocks?It shouldn't be re-indented at all. The prettifier deliberately leaves <pre>, <textarea>, <script> and <style> contents untouched - those tags treat whitespace as content, so adding indentation would change what the page actually displays.
Yes - flip the mode toggle and click Run again on the same input. The prettify and minify passes are exact opposites, so you can round-trip without losing anything except whitespace.
No - minify before deploy and prettify when you're reading or editing. Indented HTML is easier on humans; minified HTML downloads faster for browsers. Most projects keep prettified source in git and minify in the build step.
No, this tool only re-indents - it does not validate or repair markup. If your HTML is malformed (unclosed tags, mismatched nesting), the indentation will reflect the broken structure. Use an HTML validator first if you suspect parse errors.
Pair with the HTML Minifier for the reverse pass, or the HTML to Plain Text Converter when you only need the visible content. Bookmark this page for the next time you need an accurate HTML Prettifier.