HTML Formatter & Beautifier Online Free — Format & Minify HTML
HTML Formatter beautifies messy HTML code with proper indentation and line breaks, or minifies it for production to reduce page load time. Syntax highlighting, diff view, attribute wrapping, tag case options, and comment control — all running entirely in your browser with no data uploaded.
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How to Format HTML Online Free
- 01
Paste or upload HTML
Paste HTML directly into the input panel, or click Upload to open an .html file from your computer.
- 02
Choose mode & options
Select Format (beautify) or Minify. Adjust indent size, tag case, attribute wrapping, and comment handling.
- 03
Copy or download
The result appears instantly with syntax highlighting. Switch to Diff view to compare changes, then copy to clipboard or download as .html.
Features
- ✓Format (beautify) and minify HTML in one tool
- ✓Syntax highlighting: tags, attributes, values, comments
- ✓Diff view: line-by-line comparison of input vs output
- ✓Indent: 2 or 4 spaces, with optional tab support
- ✓Tag case: preserve, lowercase, or UPPERCASE
- ✓Wrap attributes option for long opening tags
- ✓Toggle comment preservation on/off
- ✓100% client-side — HTML never leaves your browser
Frequently Asked Questions
- What does an HTML formatter do?
- An HTML formatter (also called an HTML beautifier) takes messy, unindented, or minified HTML and reformats it with consistent indentation and line breaks so it is easy for humans to read and edit. It does not change the visual output of the webpage — only the source code structure.
- How does HTML minification work?
- HTML minification removes unnecessary whitespace, line breaks, and comments from HTML source code. This reduces file size, typically by 10–30%, which speeds up page load times. Minified HTML is harder for humans to read but functionally identical to the original.
- What indent options are available?
- You can choose 2 or 4 spaces per indent level. The "Wrap attributes" option places each HTML attribute on its own line, which is useful for elements with many attributes. Tag case can be preserved, forced to lowercase, or forced to uppercase.
- What is the diff view?
- The diff view shows a line-by-line comparison between your original input and the formatted output. Lines that were added appear in green with a + prefix, and lines that were removed appear in red with a - prefix. Unchanged lines are shown without highlighting.
- Is my HTML code sent to a server?
- No. All HTML formatting and minification runs entirely in your browser using JavaScript. Your HTML code is never uploaded to any server and is never stored or logged. The tool works completely offline once the page has loaded.
- Does the formatter handle inline vs block elements differently?
- Yes. Block elements like div, section, p, and h1–h6 each start on a new indented line. Inline elements like span, a, strong, and em are kept inline with surrounding content. Pre-formatted elements like pre, script, and style blocks have their content preserved verbatim.