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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 decimal and the other way for any string input.
Easily remove duplicate lines from a text.
Get all the HTTP headers that an URL returns for a typical GET request.
Get all possible details about an SSL certificate.
Take an IP and try to look for the domain/host associated with it.
Make sure your passwords are good enough.
Get all possible details about a domain name.