If you have ever asked if JPEG and JPG are distinct file types, you are not alone. This is one of the most common questions in digital imaging, and the answer is simple: JPEG and JPG are exactly the same format.
The difference is the file extension — a three-letter leftover of old Windows operating systems unable to use 4-character extensions. Regardless, there are sometimes situations when you might need to rename or convert images from .jpeg to change jpeg extension to jpg .jpg.
JPEG stands for Joint Photographic Experts Group, the group which developed the format in 1992. Legacy versions of Windows needed extensions to be no longer than 3 characters, hence why the extension became JPG.
Nowadays, both file types are recognized by all platform, browser and application. Regardless of whether a file is stored as image.jpg or image.jpeg, it will open exactly the same.
Although they are the identical format, some older software only accept .jpg extensions and will not accept .jpeg extensions based on the suffix. For these situations, converting the extension from .jpeg to .jpg is sufficient.
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