ToolzyLab
Format messy HTML, fix indentation, clean whitespace, minify output, inspect tag structure, and preview the result live in your browser. Paste raw markup or upload an HTML file and beautify it instantly with zero uploads.
Clean ugly markup, make nested tags readable, normalize spacing, inspect the document outline, preview the rendered result, and export polished HTML with a compact professional interface built for developers.
Paste HTML, upload a .html file, or drop markup text here to format and preview instantly.
📄 .html / .htm · ⚡ instant format · 🌳 structure stats · 🖥 live preview · 🔒 no uploadWrite or paste raw HTML on the left, then inspect the beautified result on the right.
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Expand tags and inspect nested structure quickly after formatting or cleaning.
Beautify when debugging layout or inspecting nested components. Use clean mode to normalize whitespace and remove comments when needed. Use minify mode for production snippets or compact exports.
Preview the cleaned HTML instantly after beautifying, cleaning, or minifying.
It parses your HTML in the browser, formats nested tags cleanly, normalizes whitespace, optionally removes comments, counts structural stats, shows an expandable DOM outline, and lets you preview and download the cleaned result without sending anything to a server.
HTML formatting helps people inspect nesting and attributes, but a browser parser can repair malformed markup in ways that hide the original mistake. Choose indentation, tag casing, attribute handling, comments, void-tag style, and cleanup deliberately, then validate the structure and preview trusted output before replacing source markup.
Missing closing tags, invalid nesting, duplicate attributes, and stray table elements can be corrected or moved by an HTML parser. Compare the formatted tree with the intended semantics and run a standards validator. A clean indentation pattern does not prove that labels, landmarks, headings, forms, or interactive elements are valid.
Text nodes, inline elements, pre, textarea, code samples, emails, templates, and script or style content can depend on spaces and line breaks. Minifying or cleaning may also remove comments used by build tools or conditional systems. Review rendered text and generated output around every whitespace-sensitive region.
Only preview HTML you trust, and keep sanitization enabled where offered. Scripts, event-handler attributes, embedded frames, forms, and dangerous URLs can execute or transmit data in a permissive preview. Formatting is not sanitization and should never be used as an XSS defense.
Validate both the DOM structure and the visible result before adopting the output.
Technical references: MDN HTML reference
It can make nesting easier to see and a parser may repair some errors, but that repair may not match the intended document. Use a validator and inspect semantics.
It can around inline text and in whitespace-sensitive elements or templates. Compare rendered content and source around code, preformatted text, and mixed inline elements.
HTML tag names are case-insensitive in ordinary HTML syntax, but lowercase is the common convention and avoids confusion with XHTML or XML, where case matters.
It applies the tool's supported normalization rules beyond simple indentation. Review the resulting attributes, comments, and structure because cleanup cannot infer project-specific intent.
No. Formatting does not remove scripts, event handlers, forms, frames, or dangerous URLs. Use a proven sanitizer and an isolated security design for untrusted markup.
It can reduce transfer bytes, especially without compression, but images, scripts, CSS, caching, and rendering work often matter more. Measure the complete page.