Minify your HTML by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Make sure your passwords are good enough.
Take an IP and try to look for the domain/host associated with it.
Convert kilometers per hour (kph) to miles per hour (mph) with ease.
Extract email addresses from any kind of text content.
Get all possible details about a domain name.