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 decimal and the other way for any string input.
Validate JSON content and make it looks good.
Get approximate IP details.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get details of any file type, such as the mime type or last edit date.
Get all possible details about an SSL certificate.
Check whether or not a website is using the new HTTP/2 protocol or not.