HTML Formatter & SEO Toolbox
Beautify code, extract meta tags and analyze SEO structure
Free Online HTML Formatter & Toolbox - Beautify, Minify, Convert & Preview
Clean, format and optimize HTML instantly. Our browser-based HTML Formatterhelps developers, designers and content creators turn messy markup into readable, production-ready code - without sending your data to a server. Includes beautification, advanced minification, HTML → JSX conversion, a sandboxed preview, validation, file import/export and local history snapshots.
Why format and optimize HTML?
Clean HTML improves maintainability, reduces file size, and helps avoid rendering bugs. Minified output reduces bandwidth and improves page load speed. Converting HTML to JSX allows smooth migration to React. This tool gives you both developer-friendly readability (beautify) and production-ready compactness (minify).
Key Features
- Beautify - Pretty-print HTML using Prettier-style rules with adjustable indentation.
- Advanced Minifier - Remove comments, collapse whitespace, optimize inline CSS/JS, remove redundant attributes.
- HTML → JSX Converter - Convert HTML to modern React JSX syntax.
- Live Preview - Safe, sandboxed iframe preview using DOMPurify.
- File Import & Export - Upload HTML/TXT files and export beautified, minified or JSX output.
- Auto-format on paste, undo/redo, and snapshot history stored locally.
- 100% client-side - Nothing is uploaded to any server.
How to use
- Paste or upload your HTML into the editor.
- Select Beautify, Minify, or Convert to JSX.
- Adjust advanced options as needed.
- Preview your HTML safely in the live sandbox.
- Copy or download the optimized output.
Quick best-practice tips
- Use beautified HTML for debugging, reviews and collaboration.
- Use minified HTML for production to reduce payload and speed up rendering.
- When converting to JSX, double-check dynamic attributes.
- Save snapshots before major edits (stored in your browser).
- Preview sanitized HTML to ensure no unwanted scripts run.
Frequently Asked Questions
What does this HTML Formatter do?
It reformats messy HTML into readable markup (beautify) and compresses HTML for production (minify). It also converts HTML to JSX, validates structure and provides a safe live preview.
Is my HTML uploaded to your server?
No. All processing happens locally in your browser. No data leaves your device.
Which file types can I upload?
You can upload .html, .htm and .txt. Output can be exported as HTML, JSX or plain text.
How accurate is the HTML → JSX conversion?
Common patterns convert correctly. Some dynamic templates may require manual fixes.
Can this tool remove comments or minify inline CSS/JS?
Yes. The advanced minifier removes comments, collapses whitespace and optimizes inline CSS and JS.
Does the preview run HTML scripts?
No. The preview is sanitized using DOMPurify and runs inside a sandboxed iframe.
Is it free?
Yes - the tool is fully free and requires no login.
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