ALZ file format is used by ALZip software. ALZip is a compression software which is used to compress and extract files. This software supports up to 30 compression formats and it also has its own compression format known as ALZ format.

This file format was created to solve the size limit issue of ZIP file format. ALZ file format has theoretically no upper limit of file size when it comes to compression. The compression technique used in this file format is similar to that of ZIP file format. The only limitation of size for ALZ file format is because of the operating system limitations.