Minify your HTML by removing all the unnecessary characters.
Minify your CSS by removing all the unnecessary characters.
Separate text back and forth by new lines, commas, dots...etc.
Easily convert IDN to Punnycode and back.
Take an IP and try to look for the domain/host associated with it.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get the size of a text in Bytes (B), Kilobytes (KB) or Megabytes (MB).
Get all possible details about an SSL certificate.