Minify your HTML by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Extract email addresses from any kind of text content.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get the gravatar.com globally recognized avatar for any email.
Get all possible details about a domain name.
Get all possible details about an SSL certificate.
Check if the URL is banned and marked as safe/unsafe by Google.