Independent JPEG Group

IJG is an informal group that writes and distributes a widely used free library for JPEG image compression. The first version was released on 7-Oct-1991.

The current version is release 9f of 14-Jan-2024. This is a stable and solid foundation for many application's JPEG support.

You can find our original code and some supporting documentation in the directory files. There is a Windows format package in zip archive format and a Unix format package in tar.gz archive format jpegsrc.v9f.tar.gz. A collection of modified versions with adaptions and error fixes for system maintenance is available on in the directory support.

To learn more about how to use JPEG, see the JPEG FAQ. If you'd like to learn about how JPEG works, start with the comp.compression FAQ.

IJG is not affiliated with the ISO/IEC JTC1/SC29/WG1 standards committee (previously known as JPEG, together with ITU-T SG16).

IJG development continues. Advanced features are being prepared for coming releases...

The development site for new versions is the JPEG Reference site.