When comparing Sumatra PDF vs Xodo PDF Reader & Editor, the Slant community recommends Sumatra PDF for most people. In the question“What are the best PDF viewers for Windows?” Sumatra PDF is ranked 1st while Xodo PDF Reader & Editor is ranked 3rd. The most important reason people chose Sumatra PDF is:
Sumatra is available for free, licensed under GPL with source code available on [GitHub](https://github.com/sumatrapdfreader/sumatrapdf).
Ranked in these QuestionsQuestion Ranking
Pro Free and open source
Sumatra is available for free, licensed under GPL with source code available on GitHub.
Pro Starts quickly
Pro Low resource usage
Pro Does not have heavy editor features
Annotations and other heavy features are just not needed in reader.
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 Extensive keyboard shortcuts
It's available in 69 languages.
Pro Elegant interface
Pro Great handling for S-Pen/Digitizer
Can open more than one PDF at a time in tabs.
Pro No ads
The reader offers a lot of features for free with no ads.
App can reflow any PDF for an enhanced reading on small terminals. The process is a bit slow but works for every PDF.
Pro PDF can be read from SD Card
Xodo does not copy the PDF files to the internal memory.
Pro Very (very) good support
Feature Requests and bugs are nicely handled.
Pro Works great with diverse cloud services (e.g. Seafile) and saves changed documents on the fly in the cloud
Pro Efficient user interface
You get what you want by few interactions.
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 Windows only
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.
Con Lag when reading
When switching pages, there can be some lag and a re-zoom of the page.