JPEG and JPG are exactly the same photo formats. No distinction between a .jpg photo and a .jpeg photo — both apply the identical JPEG compression standard and save photos in the identical manner.
The difference is purely in the file extension, as it is a legacy issue from early computer history. JPEG was developed in 1992 by the Joint Photographic Experts Group. The Windows operating system launched early versions of Windows, the OS had a limitation: extensions were limited to be 3 characters.
This here forced the 4-character .jpeg suffix to be reduced to .jpg for PC users. Apple and Unix platforms, which never had the character limit, could use the longer .jpeg file extension from the beginning.
Even though both file types work identically in nearly all current applications, there are specific scenarios in which a platform might need the .jpeg file type. For these situations, renaming the file from .jpg to .jpeg is sufficient.
No image conversion of image data is necessary — just renaming the file extension resolves the issue almost always.
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