JPG

Joint Photographic Experts Group

A photo of a cat with the compression rate decreasing, and hence quality increasing, from left to right.
Filename extension	.jpg, .jpeg, .jpe .jif, .jfif, .jfi
Internet media type	image/jpeg
Type code	JPEG
Uniform Type Identifier (UTI)	public.jpeg
Magic number	ff d8 ff
Developed by	Joint Photographic Experts Group
Initial release	September 18, 1992; 24 years ago (1992-09-18)
Type of format	lossy image format
Standard	ISO/IEC 10918, ITU-T T.81, ITU-T T.83, ITU-T T.84, ITU-T T.86
Website	www.jpeg.org/jpeg/

External image

Illustration of edge busyness

JPEG (/ˈdʒeɪpɛɡ/ JAY-peg) is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPEG typically achieves 10:1 compression with little perceptible loss in image quality.

JPEG compression is used in a number of image file formats. JPEG/Exif is the most common image format used by digital cameras and other photographic image capture devices; along with JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the World Wide Web. These format variations are often not distinguished, and are simply called JPEG.

The term "JPEG" is an initialism/acronym for the Joint Photographic Experts Group, which created the standard. The MIME media type for JPEG is image/jpeg, except in older Internet Explorer versions, which provides a MIME type of image/pjpeg when uploading JPEG images. JPEG files usually have a filename extension of .jpg or .jpeg.