JPEG and JPG are the same photo formats. No distinction between a .jpg photo and a .jpeg photo — both formats apply the identical JPEG compression standard and save image data in the same way.
The difference is purely in the suffix, as it is a relic from the early days of computing. JPEG was created in 1992 by the Joint Photographic Experts Group. When Microsoft released early versions of Windows, the OS had a limitation: convert jpg file to jpeg extensions were limited to be 3 characters.
This forced the 4-character .jpeg extension to be shortened to .jpg for Windows computers. Apple and Unix platforms, which never had the character limit, could use the longer .jpeg file extension from the beginning.
Even though both extensions work identically in almost every modern software, certain cases where a system may specifically require the .jpeg file type. In these cases, converting from .jpg to .jpeg is sufficient.
No image data conversion is necessary — just updating the file extension resolves the issue almost always.
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