These two formats are identical file formats. There is absolutely no difference between a .jpg image and a .jpeg image — both formats use exactly the same JPEG compression standard and save image data in the same way.
The difference is only in the suffix, as it is a legacy issue from early computer history. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. When Microsoft released early versions of Windows, the OS had a constraint: extensions were limited to be three characters long.
Which forced the 4-character .jpeg extension to be reduced read more to .jpg for Windows computers. Apple and Unix platforms, which never had the character limit, could use the longer .jpeg extension from the beginning.
Even though both extensions perform equally 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 required — just renaming the file extension resolves the problem almost always.
Try alljpgconverters.com for a totally free browser-based JPG to JPEG tool with no account necessary.