HTML Formatter Guide: Pretty-Print and Validate HTML
2026-05-24
Quick Answer
Quick Answer: Paste HTML into our HTML Formatter, click Format for readable indentation or Minify for a compact snippet. Validation runs locally in your browser.
Why format HTML?
- Review email templates — indented markup is easier to spot missing tags
- Debug CMS output — clean up auto-generated fragments before shipping
- Prepare snippets — readable HTML for docs, Stack Overflow, or code reviews
Format vs minify
| Action | Result |
|---|---|
| Format | Adds line breaks and indentation (2 or 4 spaces) |
| Minify | Removes extra whitespace between tags |
| Validate | Parses HTML and confirms the snippet is well-formed |
Common HTML mistakes
| Error | Fix |
|---|---|
| Unclosed tag | Every <div> needs a matching </div> |
| Mismatched names | Opening and closing tag names must match |
Unescaped < in text | Use < inside text nodes when needed |
| Broken attributes | Quote attribute values and escape " as " |
Try It Yourself
Clean up your HTML with the free HTML Formatter →
Frequently Asked Questions
Does formatting change how browsers render the page?
Whitespace between tags is generally insignificant. Formatting is safe for templates and snippets.
Can I format a full document with <html> and <head>?
Yes—paste the fragment or full document. The tool parses content with the browser DOMParser.
HTML vs XML formatter—which should I use?
Use the HTML formatter for web markup and templates. Use the XML Formatter for strict XML configs and feeds.