Upload a QR code image and extract the data out of it.
Take an IP and try to look for the domain/host associated with it.
Get & verify the meta tags of any website.
Get the web-host of a given website.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get approximate IP details.
Compress and optimize images for a smaller image size but still high quality.