JPEG (Joint Photographic Experts Group)
JPEG (.jpeg) is the full-extension variant of .jpg, containing identical image data. Both extensions refer to the same JPEG compression standard — the difference is purely cosmetic. The .jpeg extension is less common but is technically the full name of the format.
MIME Type
image/jpeg
Type
Binary
Compression
Lossy
Advantages
- + Same universal support as .jpg — every device and browser
- + Self-documenting extension — clearly identifies the format
- + Full-length extension aligns with modern naming conventions
Disadvantages
- − Same lossy compression limitations as .jpg
- − Some tools and frameworks default to .jpg, not .jpeg
- − No technical difference — choosing one is a style preference
When to Use .JPEG
Use .jpeg or .jpg interchangeably; .jpg is more common on the web and in file systems, but .jpeg is equally valid.
Technical Details
Identical to .jpg — DCT-based lossy compression with configurable quality (1-100). The JFIF or Exif container stores image data, metadata, and optional thumbnails. Both extensions produce the same MIME type image/jpeg.
History
The .jpeg extension existed from the format's inception in 1992 but was shortened to .jpg due to the 8.3 filename limitation of early DOS and Windows. Both extensions have been interchangeable since long-filename support became standard.