Free HTML Beautifier Online
Format and beautify HTML code with proper indentation. Free, fast, and works entirely in your browser with no sign-up required.
HTML Beautifier
Format, beautify, and minify HTML code with validation, syntax highlighting, live preview, and advanced formatting options.
Formatting Options
Input HTML
Beautified HTML
Beautified HTML will appear here...
About HTML Beautifier
This tool formats, beautifies, and minifies HTML code with validation, syntax highlighting, live preview, diff comparison, and advanced formatting options.
Features:
- Beautify and minify modes with one-click toggle
- Syntax-highlighted output with color-coded tags, attributes, and values
- Live HTML preview in sandboxed iframe
- Side-by-side diff view comparing input and output
- HTML validation with errors, warnings, and accessibility suggestions
- Tag statistics: element counts, attribute counts, depth analysis, document assessment
- Customizable indent size (2, 4, 6, 8 spaces) and tabs
- Tag case transformation (lowercase, UPPERCASE, preserve)
- Attribute formatting: auto, one per line, aligned, or preserve
- Attribute sorting (id and class first, then alphabetical)
- Remove comments and empty tags options
- Drag-and-drop file upload with auto-format on paste
- Batch processing: upload and format multiple HTML files with error counts
- Undo/redo support with keyboard shortcuts
- History: save and reload previous formatting sessions (stored locally)
- Preferences are saved between sessions
- File upload (.html, .htm, .xml, .svg) and formatted download
Privacy First: All formatting happens locally in your browser. Your code is never sent to any server. Preferences and history are stored in localStorage.
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Frequently Asked Questions
What is the HTML Beautifier?
The HTML Beautifier is a free online tool that formats and indents HTML code properly for better readability and maintainability.
Is the HTML Beautifier free?
Yes, it is completely free with no registration required. All formatting happens client-side in your browser.
Can I customize the indentation?
Yes, the HTML Beautifier lets you choose between tabs and spaces and set the indentation width for your preferred code style.
Is my data safe with this tool?
Absolutely. The HTML Beautifier processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the HTML Beautifier work on mobile devices?
Yes, the HTML Beautifier is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the HTML Beautifier in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
How do I use the HTML Beautifier?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The HTML Beautifier works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
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About Free HTML Beautifier Online
Free HTML Beautifier Online is a free, browser-based tool in our Code Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.