PixInsight is an advanced image processing software platform. It has been designed specifically for astrophotography and other technical imaging fields. PixInsight is a modular, open-architecture system where the entire processing and file handling capabilities are implemented as external installable modules. PixInsight has been ported as a native 64-bit application to FreeBSD, Linux, macOS and Windows operating systems. PixInsight is a strongly multithreaded environment able to exploit all processors and processor cores available on modern hardware.