When comparing Greenshot (for Windows) vs PrtScr, 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 PrtScr is ranked 22nd. 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).
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Pros
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.
Pro Can quickly add rectangles or draw notes
Using the control-button, you're able to draw red rectangles on the screenshot to emphasize something and you're also able to draw freely to quickly highlight or add notes.
Pro Very intuitive to use
You just have to hit the PrtScr-button on your keyboard, click once if you want to capture your entire screen, or use the shift-key to select a certain rectangular area you want to screenshot. You can also use the cursor to screenshot a very specific freely drawn shape.
Cons
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