HTML Validation

Just enter the address of the page you wish to check for errors, and click the "Check" button.

Indent element content
Omit optional end tags
Force tags to upper case
Replace FONT, NOBR and CENTER tags by CSS
Strip out smart quotes and em dashes, etc.
Output numeric rather than named entities
Specify the input is well formed XML
Do additional accessibility checks

This service uses a free program called HTML Tidy