You know exactly if a format is supported or not as FastStone Image Viewer will hide all unsupported formats when you browse the connected hard drives and storage locations. If you want support for unsupported video formats, you need to install the codecs on the Windows machine using third-party distributions. That's the care for many popular format such as mkv or mp4, but not for other formats such as flv. What this means is that video formats are only supported by it if the code is available on the system. One caveat is however that the video player relies on system codecs and does not come with its own set of binary codecs. This means that you may use the program now to view image and video files natively in the program interface. The big new feature of FastStone Image Viewer 6.3 is the built-in video player. It is ad-free, and the installer is free from other nasty things such as adware offers. The program is offered as a free portable version and as a version that you can install on a Windows machine.

We reviewed version 4.0 of the image viewer back in 2009, and - recently - the new FastStone Image Viewer 6.0 release that was published in 2016.

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