Paste HTML
Add your markup.
Code & Data Tool
HTML Validator
Check for common unclosed HTML tags and malformed structure.
Loading workspace...
About this tool
What is HTML Validator?
HTML Validator performs a lightweight check for unclosed tags and malformed structure. It is a quick sanity check rather than a full standards validator.
Useful when you need to
- Find an unclosed div in a web assignment
- Check a snippet before pasting into a CMS
- Learn which tags need closing
How to use
How to use HTML Validator
01 02 Validate
Run the check.
03 Read results
Look at the reported tag problems.
04 Fix and re-run
Correct the HTML and validate again.
Tips
Get better results
- This is a lightweight check. For formal validation use the W3C validator.
- Void elements such as br and img do not need closing tags.
FAQ
Frequently asked questions
Is it a full validator?
No, it catches common structure problems only.
Does it check accessibility?
No.
Is it private?
Yes.
More practical guides · File handling and privacy · Report an incorrect instruction