Virtual stream library(VSL) is a C++ developers library, that allows developers to work with any data faster and easier. Library includes functions, which is necessary in every program - operation with files, parts of data, memory, disc space, compression, file archiving, strong encryption and hashing, security functions - all this in a few strings of code! Library includes tools to add, delete, mix, change a size of data, import and export parts of files on disk and in memory, error tracking and much more. VSlibrary helps to develop fast, compact and multiplatform programs easily and in the shortest time. Distribution package of VSL includes several small programs with the source code, for demonstration of some possibilities of VirtualStream and full documentation.