Beautify Messy HTML Markup
This HTML formatter turns minified or tangled markup into clean, properly indented HTML in real time, right in your browser. Paste a single-line page or a mess of nested tags and the beautified result appears instantly in the right-hand panel, with consistent indentation and tidy attribute placement.
Common Use Cases
Unminify Pages
Clean Up Markup
Review & Learn
How to Format HTML
Paste Your Markup
Type or paste HTML into the Input panel on the left. You can also Upload an .html file or click Sample to load an example.
See Instant Output
The formatted, syntax-highlighted markup appears automatically in the right panel as you type. Line numbers and a live size counter make large documents easy to navigate. Press Ctrl + Shift + F to reformat on demand.
Adjust Options
Set the indent (2, 3, 4, 8 spaces or Tab), the print width, how attributes wrap, and where the closing bracket sits. The output re-formats immediately.
Copy or Download
Click Copy to grab the result or Download to save it as an .html file. Use Edit to tweak the output by hand before exporting.
HTML Beautifier Options
Formatting Controls
These controls adapt Prettier's HTML output to your preferred markup style. Every change re-formats the result instantly.
| Option | Choices | What It Controls |
|---|---|---|
| Indent | 2 · 3 · 4 · 8 spaces · Tab | Indentation width and character used per nesting level (default 4 spaces). |
| Print Width | 80 · 100 · 120 | Target line length before long tags and text wrap (default 80). |
| Attributes | Auto wrap · One per line | Whether attributes stay inline or each go on their own line. |
| Bracket | New line · Same line | Whether the closing > of a multi-line tag drops to a new line. |
What Gets Formatted
Tags & Attributes
Consistent nesting, tidy attribute spacing, and correct handling of self-closing and void elements.
Embedded CSS & JS
Code inside <style> and <script> blocks is formatted inline alongside the markup.
Built-In Tools
Real-Time Formatting
Output updates as you type, with syntax highlighting and matching line-number gutters.
Upload & Download
Load a local .html file or export the formatted result with one click.
Editable Output
Switch the result panel to edit mode to make manual tweaks before copying.
Frequently Asked Questions
What does an HTML formatter do?
It re-indents raw, minified, or messy HTML into clean, human-readable markup with consistent spacing and line breaks. "HTML formatter" and "HTML beautifier" describe the same job — making markup easy to read and maintain.
Does formatting change how the page renders?
No. Beautifying only adjusts whitespace and indentation for readability. The tags, attributes, and content stay the same, so the page looks and behaves exactly as it did before.
Is my HTML sent to a server?
No. All formatting happens locally in your browser. Your markup is never uploaded, logged, or stored, so it is safe to format proprietary or unreleased pages.
Does it format CSS and JavaScript inside the page?
Yes. Code inside <style> and <script> tags is formatted inline along with the surrounding HTML, so the whole document stays consistent.
Can I put each attribute on its own line?
Yes. Set the Attributes option to "One per line" to break every attribute onto a separate line, or leave it on "Auto wrap" to let Prettier decide based on the print width you choose.
Does it minify HTML too?
No. This tool is a beautifier — it expands and indents markup for readability rather than compressing it. To shrink a page for production, use a dedicated HTML minifier instead.
What happens if the markup is malformed?
If the parser cannot process the input, the tool shows an error message describing the problem instead of producing broken output. Fix the reported issue and the formatted result reappears.