The current version is release 9 of 13-Jan-2013. This is a stable and solid foundation for many application's JPEG support.
You can find our code and some supporting documentation in the directory files. There is a Unix format package in tar.gz archive format jpegsrc.v9.tar.gz and a Windows format package in zip archive format jpegsr9.zip.
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.
The ISO/IEC JTC1/SC29/WG1 standards committee (previously known as JPEG, together with ITU-T SG16) has their own web site. IJG is not affiliated with the ISO committee.
IJG development continues. Advanced features are being prepared for coming releases...
Version 9a of the Independent JPEG Group software is currently in development and will be the first true source reference JPEG codec. It is planned for release in January 2014. The development site for new versions is at InfAI.org.