Convert text to binary and the other way for any string input.
Convert text to hexadecimal and the other way for any string input.
Convert text to ascii and the other way for any string input.
Convert text to decimal and the other way for any string input.
Get the gravatar.com globally recognized avatar for any email.
Check if the URL is cached or not by Google.
Make sure your passwords are good enough.
Convert kilograms (kg) to pounds (lb) with ease.
Get the web-host of a given website.
Get & verify the meta tags of any website.