Minify your CSS by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Get all possible details about a domain name.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get approximate IP details.
Validate JSON content and make it looks good.
Convert text to binary and the other way for any string input.
Get all the HTTP headers that an URL returns for a typical GET request.