JPEG and JPG are exactly the same image formats. There is absolutely no difference between a .jpg image and a .jpeg image — they both use exactly the same JPEG compression standard and store image data in the same way.
The difference is only in the suffix, being a legacy issue from the early days of computing. The JPEG format was created in 1992 by the Joint Photographic Experts Group. When Microsoft introduced early versions of Windows, the OS imposed a limitation: extensions were limited to be 3 characters.
This forced the 4-character .jpeg extension to be shortened to .jpg for Windows computers. Non-Windows systems, without this extension limitation, used the full .jpeg file extension from the start.
While both file types work identically in nearly all current applications, there are specific scenarios in which a service might need the .jpeg extension. For these situations, changing the extension from .jpg to .jpeg is enough.
No real file conversion is needed — only changing the extension fixes the more info compatibility concern usually.
Use alljpgconverters.com providing completely free web-based JPG to JPEG converter without software needed.