HTML Formatter Online
Paste HTML, then format it with readable indentation, check for unclosed tags, or minify it — entirely in your browser.
Paste your HTML
No unclosed or mismatched tags found ✓
Result
Never uploaded
Formatting happens entirely in your browser — your HTML never touches our servers.
Instant
No waiting, no upload progress bar — results appear the moment you click.
Free, no limit
No account, and no limit on how many times you can use it.
What is an HTML Formatter?
An HTML formatter takes minified or messy markup and reformats it with consistent indentation, making it readable — useful when inspecting a page's source, cleaning up a CMS export, or debugging a template. This tool also checks for unclosed or mismatched tags and minifies, so the same page covers all three related tasks.
How to Format HTML Online
- Paste or upload your HTML. Paste directly into the editor, or click "Upload a file" to load an .html file's contents.
- Choose a mode. Format for readable indentation, Validate to check for unclosed/mismatched tags, or Minify to strip whitespace.
- Click the action button. The result appears below — including exactly which tags are unclosed or mismatched, if any.
- Copy or download. Copy the result to your clipboard, or download it as an .html file.
Frequently Asked Questions
What is an HTML formatter?
A tool that takes minified or messy HTML and reformats it with consistent indentation, making it readable.
What does Validate check?
It scans for unclosed and mismatched tags and lists exactly which ones are affected — not a full W3C markup validator, but it catches the structural mistakes that actually break pages.
Is my HTML uploaded anywhere?
No. This tool runs entirely in your browser — your markup is never sent to CurePDF's servers.
Is the HTML formatter free?
Yes, with no account required and no limit on how many times you can use it.