Why can’t JPEGS be transparent?
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GIFs have up to 256 colors one of which can be set as transparent.
The standard for JPEG does not include designating a color as transparent, so none of the program that display or edit JPGs can do that.
If you wanted to do that you would have to modify the standard and get ever browser and image display and edit too to incorporate the changes.
Somebody already tried that a while back .jp2 files or JPEG2000 do support transparency. However neither Firefox nor Chrome support that format and neither do many other tools that you usually use JPEGs with.
JPEG XR is another JPEG based file format that includes transparency but it is a Microsoft made standard and not widely adopted outside of MS products.
PNG is a file format unrelated to JPG and it supports transparency and is supported by almost any modern software out there that deal with image files.
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