When comparing Chromium vs Sumatra PDF, 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 Chromium is ranked 4th. 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 Completely open source
Unlike Google Chrome, Chromium is completely open source.
Pro Supports all of Google Chrome features
As Chrome is based on Chromium they overlap in supported features. Chromium syncs between devices, automatically updates, has great built-in developer tools, installs extensions without a restart, includes a combined text bar for entering URLs and searching and has excellent HTML5 compatibility just like Chrome.
Chrome and Chromium are available on almost every device nowadays
Pro Access to Chrome's extensions
Chromium can access the Chrome Web Store and all the extensions hosted there can be installed and used on Chromium.
Every tab and plugin runs in its own subprocess so they will never affect the whole browser ,however that consumes more memory than other browsers
Pro Backed by Google
Chromium was first released as a large portion of Chrome's source code as an open source project by Google in september 2008. The idea was to encourage developers to review the underlying code and to contribute in making Chrome cross platform and port it to Mac and Linux as well.
Nowadays Chromium is a large project with a huge community that's standing behind it but still Google continues to take an extremely active role in Chromium development. This ensures the longevity and constant development and improvement of the browser.
Pro Free and open source
Sumatra is available for free, licensed under GPL with source code available on GitHub.
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 Starts quickly
Pro Extensive keyboard shortcuts
Pro Does not have heavy editor features
Annotations and other heavy features are just not needed in reader.
Pro Low resource usage
It's available in 69 languages.
Pro Elegant interface
Con High RAM usage
Just like Chrome, Chromium also eats a lot of RAM, which can be a problem for machines with smaller RAM.
Con Lacks privacy options
Con Simple, dull, bare-boned
Con Lacks support for certain common media formats
As Chromium avoids bundling any proprietary software, media that requires proprietary codecs or formats such as AAC, H.264, MP3 and Flash will not play by default on Chromium.
Con Doesn't read cookies properly
... and for this reason it only remembers the user logins only in the session. Once the browser is restarted for whatever reason, it forgets everything and the user has to login again everywhere which can become annoying very quickly.
Con Not possible to disable WebRTC
Con No official builds
There are no official builds available so you have to rely on a third party distributor
Con Misses some proprietary multimedia codecs
Unlike chrome, Chromium misses proprietary multimedia codecs per default. There might be some ways over ffmpeg and co but it is still a gray zone. Also by enabling, it also removes one of the core features of Chromium of being open source software
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.