Quote Originally Posted by mutton View Post
from a brief search, there can be EXIF, IPTC and XMP metadata

if you can't find software/websites to easily read/remove metadata, i will look into making one
There are plenty of software to read/remove metadata. PhotoME is one free Exif and IPTC editor, the best of its kind in my opinion. Here you can find various XMP tools. To completely remove metadata you can use tools like BatchPurifier LITE and jStrip, both are freewares.