XnView MP Portable is a free image viewer that is a popular choice for its numerous features typically found in commercial image viewers. It supports many image file formats that other powerful image organizers, such as ACDSee, do not support.

With XnView MP Portable, you can read over 400 image file formats, various audio and video file formats, and write 50 image file formats. It also supports ICC profiles in JPEG, PNG, and TIFF files. The software can display IPTC, Exif, and XMP metadata and write IPTC metadata. However, it currently does not allow batch writing of IPTC metadata or sorting of thumbnails within a folder by a user-defined order.

The software includes several image editing tools like color and size manipulation, filters, and effects. You can also create advanced slideshows; lossless turning, flipping, and cropping JPEG files are supported.

In summary, XnView MP Portable is a versatile, feature-rich image viewer that's free for non-commercial purposes and is fully usable for any skill level.

There are also installer, Linux and Mac versions available.

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