A data and image compression program for Windows, Mac and Linux from Smith Micro Software Inc., Aliso Viejo, CA (www.smithmicro.com). Originally developed by Raymond Lau at age 16, StuffIt was the de facto compression utility for the Mac, superseding PackIt. StuffIt creates .SIT and .SITX archives, the latter providing special compression algorithms based on the type of data being compressed. StuffIt compression programs are commercial packages for compressing and decompressing, while the StuffIt Expander decompressor is free. StuffIt Wireless is for PDAs and Windows Mobile smartphones.

More JPEG Compression
Released for Windows Vista in 2007, StuffIt Deluxe 11 compresses MP3 files and JPEG images by up to 30%. The company acquired StuffIt in 2005 as part of its purchase of Allume Systems (formerly Aladdin Systems).