When comparing XnView vs Irfanview, the Slant community recommends Irfanview for most people. In the question“What are the best image viewers for Windows?” Irfanview is ranked 2nd while XnView is ranked 3rd.
Ranked in these QuestionsQuestion Ranking
Pro Includes simple editing tools
Typical image editing tools are included. For instance, there are tools for color and size manipulation, several filters and effects.
Pro Supports over 500 image formats
Pro Available for macOS, Linux and Windows
Pro Easy redate and view configuration
Pro Compare images side-by-side
To delete blurry phone pics, etc.
XnView speaks over 30 languages.
Pro Portable version for Windows available
Pro Some editing tools included (cropping, color correcting, etc...)
Pro Lots of plugins available
Plugins can be found here.
Pro Batch processing
Even exif information can be batch processed.
Pro You can just scroll with your mouse to explore images
Pro Recognizes virtually any image format
Pro Ultra fast
If you press and hold the right-arrow button (for displaying the next image), you can watch images pass by as if they are a video, it's that fast. No stuttering, it loads images as fast as your hard drive can keep up.
Pro Can use 8bf (Photoshop) filters
Con Free only for private use
For use in a company 1 license starts at 26 EUR.
Con Doesn't show movies on phone in correct position
Some of mp4 files shows in upside down position.
Con Doesn't pan/zoom fluidly with touchscreen
Con GIF viewing is buggy
GIF viewing has longstanding problems like flickering, incorrect framerate or artifacts, and it is very unlikely that it will be ever fixed.
Con Windows only
Con UI is far from ideal
Sometimes the interface is confusing.
Con Preferences are hard to find
Con No transparency support
The alpha is converted to the selected background color upon opening a picture. When saving the picture again, you can select a color which is converted to alpha again.