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 decimal and the other way for any string input.
Convert text to octal and the other way for any string input.
Get the gravatar.com globally recognized avatar for any email.
Convert kilograms (kg) to pounds (lb) with ease.
Check if the URL is cached or not by Google.
Check if the URL is banned and marked as safe/unsafe by Google.
Get & verify the meta tags of any website.
Make sure your passwords are good enough.