These two formats are exactly the same file formats. No difference between a .jpg photo and a .jpeg file — both formats employ exactly the same JPEG compression standard and encode pictures in the same way.
The only difference is only in the file extension, being a legacy issue from early computing. The JPEG format was created in 1992 by the Joint Photographic Experts Group. Early Windows released early versions of Windows, the operating system had a limitation: file extensions were limited to be 3 characters.
Causing the 4-character .jpeg suffix to be reduced to .jpg for Windows computers. Non-Windows systems, which never had the three-character restriction, could use the full .jpeg file extension from the outset.
Even though both file types perform equally in nearly all today's programs, certain cases in which a platform may specifically require the .jpeg extension. When read more this happens, converting from .jpg to .jpeg is enough.
No real data conversion is required — simply updating the file extension solves the issue almost always.
Try alljpgconverters.com for a totally free online JPG to JPEG tool with no download needed.