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 octal and the other way for any string input.
Check if the URL is cached or not by Google.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get approximate IP details.
Separate text back and forth by new lines, commas, dots...etc.
Get all possible details about a domain name.
Minify your HTML by removing all the unnecessary characters.