Does it support HTML5?
Yes, it fully supports all modern HTML5 tags, including custom elements and data attributes.
HTML Beautifier — Free Online Code Formatter
Beautify and format HTML5 source code • Clean up messy or minified markup instantly
Last updated: May 2026
Developer Tools 0.0(0 Reviews)
Beautify, format, and indent your HTML code instantly. Clean up messy source code for better readability, W3C compliance, and SEO-friendly markup.
• Fact-Checked & Verified•Compliance: 2026 Standards•Last Updated: May 2026
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Why Use our HTML Beautifier?
Beautify, format, and indent your HTML code instantly. Clean up messy source code for better readability, W3C compliance, and SEO-friendly markup.
How it works
The tool uses the js-beautify engine to parse and reconstruct the HTML DOM tree, applying your preferred indentation and line-wrapping rules in real-time.
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Key Features of HTML Beautifier
One-click beautification
Customizable indentation
Minification support
Zero-latency processing
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Common Questions About HTML Beautifier
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HTML Beautifier Utility Performance Specs
Enginejs-beautify
StandardsW3C Compliant
// All processing occurs locally in your browser. WebToolkit Pro does not transmit, store, or log your input data.
Looking for more professional developer utilities?
Explore All WebToolkit Pro ToolsEditorial Standards & Processing Transparency
This utility is engineered and maintained under strict editorial and technical standards. All source calculations are audited against official formatting standards and RFC specifications to guarantee mathematical and logic accuracy.
Content Creation & Automation Transparency: To ensure our dynamic developer specifications and reference datasets remain fully comprehensive and updated against newly released RFC updates, this page compiles technical documentation using advanced programmatic retrieval tools. Every output data block, feature list, and system specification is subsequently audited, fact-checked, and verified by our systems engineers for absolute correctness and accuracy.
Security Guarantee: To guarantee absolute user privacy, this tool executes 100% client-side inside your web browser. None of your input strings, payloads, keys, or files are ever transmitted to a server or stored externally.
Built by Abu Sufyan • Also explore: Severance Calculator & TradeConvert
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