These two formats are exactly the same file formats. There is absolutely no distinction between a .jpg photo and a .jpeg photo — both employ the very same JPEG compression algorithm and store 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. Early Windows introduced Windows in the early era, the system imposed a limitation: extensions were limited to be 3 characters.
This forced the 4-character .jpeg extension to be reduced to .jpg for PC users. Apple and Unix platforms, which never had the three-character restriction, continued using the complete .jpeg file extension from the start.
While both file types work identically in nearly all modern software, certain situations in which a platform might need the .jpeg file type. For these situations, converting from .jpg to .jpeg is sufficient.
No image conversion of image data is required — only updating the here file extension solves the compatibility concern usually.
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