HTML Formatter & Beautifier

Format and beautify messy HTML with proper indentation, or minify it for production. Handles nested tags, inline vs block elements and embedded CSS/JS.

html-formatter.tool
Indent:
Input HTML
Output

Why Your HTML Looks Like a Wall of Text

Copied HTML from a CMS, email template or web inspector almost always arrives as a single unbroken line. No whitespace, no indentation — impossible to read. This tool fixes that instantly. Paste your HTML and click Beautify to get clean, indented output you can actually work with.

Format vs Minify

Beautify adds proper indentation and line breaks, expanding your code for human readability. Minify does the opposite — strips whitespace and comments to produce the smallest possible file for production. Both operations preserve the actual structure and content of your HTML exactly.

When to Minify HTML

Minified HTML reduces page weight marginally but every byte counts on mobile connections. For static sites and landing pages, minified HTML combined with gzip compression can shave meaningful milliseconds off load time. Most CMS platforms handle this automatically — minification is mainly useful when shipping raw HTML files.

Frequently Asked Questions

No. Browsers ignore whitespace between HTML elements when rendering. Adding or removing indentation and line breaks has zero effect on how a page looks or behaves. The only exception is whitespace inside elements like <pre> and <code>, which preserve spacing — this tool handles those correctly.
Usually a quote mismatch in attributes, an unclosed tag, or a stray character that was already broken before formatting. The Validate button checks for unclosed tags and mismatched elements and shows you the first error found.
Block elements (div, p, h1, ul, li, table etc.) start on a new line and take full width. Inline elements (span, a, strong, em, img etc.) flow within the surrounding text. The formatter puts block elements on their own lines with indentation and keeps inline elements on the same line as their surrounding content.
Yes — tick the Format inline CSS/JS option. The tool identifies <style> and <script> blocks and applies basic formatting to their content. For complex embedded scripts, a dedicated JS formatter will produce cleaner results.
The upload button accepts files up to 10MB. Formatting runs entirely in your browser using JavaScript, so performance depends on your device. Files under a few hundred kilobytes format near-instantly. For very large files, a command-line tool like html-beautify or Prettier will be faster.
It shows how much smaller the minified output is compared to your original input. A 30% saving means the minified file is 30% smaller. This is before gzip compression — when the server gzips the response, the real-world difference is usually smaller because gzip handles repetition efficiently regardless of whitespace.

Related Tools

{}
CSS Formatter
Format & minify CSS
JS
JS Formatter
Beautify JavaScript
{}
JSON Formatter
Format & validate JSON
📝
Markdown Editor
Live Markdown preview