What is HTML Beautifier?
The HTML Beautifier is an online tool that takes unformatted, minified, or poorly indented HTML markup and transforms it into cleanly structured, properly indented code. HTML documents often become messy during development — inline editors strip whitespace, CMS platforms inject auto-generated markup, and copy-pasting from different sources produces inconsistent formatting. This tool parses your HTML, corrects the indentation hierarchy based on element nesting, aligns attributes consistently, and optionally sorts attributes alphabetically. It supports HTML5, XHTML, and common template syntaxes, handling void elements (like <br>, <img>, and <input>) correctly without adding spurious closing tags.
Why Use HTML Beautifier?
Readable HTML is essential for maintainability, code reviews, and onboarding new developers. When markup is poorly formatted, it becomes difficult to trace which closing tag belongs to which opening tag, leading to subtle bugs in layout and styling. Our beautifier restores structure to chaotic markup in seconds. It is particularly useful when inspecting HTML generated by content management systems, email template builders, or scraping tools that output minimized markup. Unlike IDE-specific formatters, this tool works in any browser, requires no configuration files, and produces consistent output regardless of the editor you use.
How to Use
Paste your HTML code into the input editor. Choose your preferred indentation size (2 spaces, 4 spaces, or tabs) and configure optional settings like maximum attribute count per line, attribute sorting, and whether to preserve inline elements. Click 'Beautify' to format the markup. The output editor shows the result with syntax highlighting. You can compare the original and formatted versions side-by-side to verify that no structural changes were introduced. Copy the result or download it as an .html file.
Example Usage
Imagine you have received a marketing email template with deeply nested table layouts, all on a single line: <table><tr><td><table><tr><td>Content</td></tr></table></td></tr></table>. Pasting this into the beautifier produces properly nested markup where each level of the table hierarchy is indented, making it trivial to locate and modify specific cells. Similarly, if a CMS outputs attributes in random order — <div style="color:red" class="box" id="main"> — the attribute sorter rearranges them to <div class="box" id="main" style="color:red">, matching team conventions.
Benefits
Instant formatting saves time compared to manual indentation. Consistent output across team members reduces merge conflicts in version control. The side-by-side comparison mode ensures beautification does not alter document structure. Support for various indentation styles accommodates different team preferences. Attribute sorting and per-line limits produce clean, standardized markup that passes code review checks.