Many people have questioned whether JPEG and JPG are different formats, you are not alone. This is one of the most common topics in image conversion, and the explanation is clear: JPEG and JPG are identical file type.
The sole difference is the file extension — a three-letter leftover of old Windows operating systems that could not handle longer file extensions. Even so, there are still situations when you might need to rename or convert images from .jpeg to .jpg.
The name JPEG means Joint Photographic Experts Group, the organization which developed the format in 1992. Older versions of Windows required extensions to be maximum three characters, that is why the format became JPG.
Nowadays, .jpg and .jpeg are accepted by all operating system, web browser and application. Whether a image is saved as image.jpg or image.jpeg, it displays the same website way.
Despite being the same file type, certain legacy systems require .jpg files and can reject .jpeg files because of the file extension. In these cases, changing the extension from .jpeg to .jpg is sufficient.
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