What about mupdf?

[ghost]

I use mupdf daily both on my phone and my computer (using zathura with mupdf backend). I would like to know what are the thoughts on it, as it does not require crazy permissions (doesn't have internet access) and zathura seems to have some sandboxing, don't know about the mobile app though. One other good thing is that the android app is avaliable on both google play and f-droid.

[matchboxbananasynergy]

It's unclear what's being proposed here. Where would this recommendation go if it were to be accepted? Currently, we recommend GrapheneOS's PDF viewer for Android here: https://www.privacyguides.org/android/#secure-pdf-viewer (It can also be installed outside of GrapheneOS).

Regarding desktop devices, I would say that people are probably better of with whatever viewer their device comes with, or even the browser.

Happy to hear more arguments in favor of looking into this, however.

[ghost]

So, the mupdf is faster than the Graphene OS one, it also supports other formats like epubs and have the search function, making a full featured mobile viewer. Also, currently the privacyguides doesn't have desktop recomendations, so I thought of making the first submission. Although on the desktop linux (some cross platform) we have a lot of good ones.

[SkewedZeppelin]

Do note many apps on Android use horrifically outdated PDF libraries: https://divestos.org/misc/appsec.txt

GrapheneOS PDF Viewer is good as long as your WebView is up-to-date.
Otherwise these ones usually update quickly: MuPDF viewer, MuPDF mini, Librera Reader