HTML美化ツール

About HTML Beautifier

HTML Beautifier is a free online tool that formats and beautifies messy HTML code by adding proper indentation and structure. It also provides a minify mode to compress HTML for production use.

Features

• Format messy HTML with proper indentation
• Minify HTML by removing whitespace and comments
• Choose indent size (2 spaces, 4 spaces, or tab)
• Real-time size comparison with savings percentage
• Copy formatted output or download as .html file
• 100% client-side — your code never leaves the browser

How to Use

1. Paste your HTML code into the input area
2. Select your preferred indent size
3. Click "Format HTML" or "Minify HTML"
4. View the output and size statistics
5. Copy the result or download the .html file

Common Use Cases

• Cleaning up HTML copied from browser DevTools
• Preparing HTML for code review
• Minifying HTML for faster page loads
• Formatting HTML from CMS exports
• Debugging messy HTML from external sources

FAQ

Does formatting change my HTML structure?

No! Formatting only changes whitespace and indentation. Your HTML structure, attributes, and content remain exactly the same.

What is the difference between format and minify?

Format adds indentation and line breaks to make HTML readable. Minify removes all unnecessary whitespace and comments to create the smallest possible file.

Can minification break my HTML?

No, HTML minification is safe. It only removes whitespace and comments. All tags, attributes, and content remain intact.

How much size reduction can I expect?

Typically 10–30% reduction depending on how much whitespace and comments your HTML contains.

Is my HTML data sent to a server?

No. All processing happens in your browser. Your HTML code never leaves your device, ensuring complete privacy.