When comparing Irfanview vs Greenshot (for Windows), the Slant community recommends Greenshot (for Windows) for most people. In the question“What are the best screen capture tools for Windows?” Greenshot (for Windows) is ranked 2nd while Irfanview is ranked 13th. The most important reason people chose Greenshot (for Windows) is:
Greenshot is licensed under GPL with source code available on [BitBucket](https://bitbucket.org/greenshot/greenshot).
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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 Recognizes virtually any image format
Pro You can just scroll with your mouse to explore images
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 Lightweight
Pro Can use 8bf (Photoshop) filters
Pro Easy updates
Very easy to update the program and its associated plugins.
Pro Irfanview Thumbnail Viewer is a convenient way to view all image files easily
Irfanview Thumbnail Viewer is a great way to view thumbnails of all image files, including thumbnails of WMF files which Windows cannot natively display.
Pro Free and open source
Greenshot is licensed under GPL with source code available on BitBucket.
Pro Freezes screen when you capture
When you enter a capture mode, the screen content is preserved as it was when you started capturing.
Pro Allows annotating, highlighting and obfuscating screenshots
Pro Can capture an entire webpage
Instead of just capturing the visible portion of the page, this tool can capture all of the page in one image by scrolling through the page, taking images at set points and then stitching the images together.
Pro Can be quickly invoked with the print screen button
Pressing the print screen button will allow you to select the captured area.
Pro Selecting custom rectangle is the default
Easy to use selection tool with a magnifier to select only the part of the screen that you need.
Pro Classic UI design makes it easy to use.
Cons
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 Irfanview Thumbnail Viewer crashes on accessing AVI files
For some reason, the Irfanview Thumbnail Viewer crashes when it tries to access any .AVI movie file.
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.
Con Missing some utilities
Like browsing files utility.
Con Preferences are hard to find
Con Windows only
Con UI is far from ideal
Sometimes the interface is confusing.
Con Scrolling window capture is only working in Internet Explorer
Con This version only works on Windows, not Linux nor Mac
However, the same author now has a separate version of Greenshot for iOS, which is available (for a small fee) in the Mac App Store at https://itunes.apple.com/us/app/greenshot/id1103915944