These two formats are exactly the same photo formats. There is absolutely no technical difference between a .jpg photo and a .jpeg file — both formats employ exactly the same JPEG encoding method and store photos in the exact same format.
The only difference is entirely in the suffix, as it is a historical artifact from the early days of computing. JPEG was introduced in 1992 by the Joint Photographic Experts Group. When Microsoft introduced Windows in the early era, the OS imposed a restriction: file extensions could only be 3 characters.
This forced the four-character .jpeg suffix to be abbreviated to .jpg for PC users. Apple and Unix platforms, without this three-character restriction, continued using the complete .jpeg extension from the outset.
Even though both extensions 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 here from .jpg to .jpeg is enough.
No actual file conversion is required — just renaming the file extension fixes the issue usually.
Use alljpgconverters.com offering a totally free browser-based JPG to JPEG converter without download required.