The current version is release 9b of 17-Jan-2016. 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 jpegsr9b.zip and a Unix format package in tar.gz archive format jpegsrc.v9b.tar.gz. A collection of modified versions with adaptions and error fixes for system maintenance is available on jpegclub.org 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 at InfAI.org.