FastLZ is a lossless data compression library designed for real-time compression and decompression. It favors speed over compression ratio. Decompression requires no memory. Decompression algorithm is very simple, and thus extremely fast.

Due to its speed, FastLZ is very useful for applications that need to save some space without a sacrifice in performance. In certain cases, using compressed working data blocks (and decompressing them on-the-fly whenever necessary) actually may improve the performance because the program uses less memory space.

FastLZ is implemented in portable C. It should compile on different platforms without problem.

FastLZ is very small and self-contained. To use it, just add one header file and one source file to the application project. Since it is distributed using MIT license, FastLZ can be used in open-source GPL/LGPL-ed applications as well as proprietary applications.

FastLZ is inspired by Herman Vogt's LZV and Marc Lehmann's LZF algorithms.