NAPS2 vs Sumatra PDF
When comparing NAPS2 vs Sumatra PDF, the Slant community recommends Sumatra PDF for most people. In the question“What are the best PDF editors?” Sumatra PDF is ranked 5th while NAPS2 is ranked 24th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easy to change brightness and contrast of pages
Only makes sense with scanned documents, as this is originally a scanning application.
Pro Easy to add, remove and reorder pages
Pro Starts quickly
Pro Free and open source
Sumatra is available for free, licensed under GPL with source code available on GitHub.
Pro Low resource usage
Pro Does not have heavy editor features
Annotations and other heavy features are just not needed in reader.
Pro Extensive keyboard shortcuts
Pro Elegant interface
Pro Portable
The application consists of a single file that can be run without installation. You can put it on an external device, such as an usb thumb stick and run it on any Windows machine from the thumb stick.
Pro Multilingual
It's available in 69 languages.
Cons
Con Does not give option to change content of invidividual pages
Con Windows only
Con Lacking in features
Sumatra aims for simplicity at the expense of functionality. For example, there's no way to annotate PDFs or edit them.
Con Fonts are not smooth enough
Not as smooth as e.g. Adobe Reader. No anti-aliasing
Con Cannot crop empty fields
Just got used to this killing feature on Goodreader on Mac.