half page display (to read one column at the time, a common layout in RPG rulebooks for example)
bookmarks
dark mode (pictures look funny but makes black-text-on-white into white-text-on-black)
tags and library management
autoscroll (I didn't think I would like it until I tried)
for ebooks you can set your own color schemes (if you prefer yellow text on gray background for example)

[–] not_amm@lemmy.ml 12 points 1 year ago (1 children)

I don't know if muPDF Viewer is, technically, free software, but i use it for the completely minimal UI. You can only read and search, it's very limited in a good way.

[–] ChaoticNeutralCzech@feddit.de 8 points 1 year ago* (last edited 1 year ago)

It is, and you can get it on F-Droid. I like how quickly it loads while still having all necessary features.

You only need Librera Reader if you want an ebook library manager with dozens of customizable features. In which case, get it on F-Droid to get all of them for free.

[–] nkiruanaya@lemm.ee 6 points 1 year ago

I used to use MJ PDF, but recently switched to the built-in PDF reader for FOSS MiX file explorer.

[–] shreddy_scientist@lemmy.ml 4 points 1 year ago* (last edited 1 year ago)

Graphenes PDF Viewer is a good option.

[–] paralyze@lemmy.basedcount.com 4 points 1 year ago (1 children)

Add KDE's repository to F-droid and download Okular.

[–] croobat@lemmy.world 3 points 1 year ago

Whoa I didn't know Okular had a mobile version. Thanks, gotta give it a try!

[–] VHS@hexbear.net 3 points 1 year ago* (last edited 1 year ago) (1 children)

I haven't been on Android in a few years but it looks like Librera Reader is still being maintained. Works great but somewhat large file size due to being a full-featured e-book/document reader rather than just PDF.

[–] radiofreeval@hexbear.net 1 points 1 year ago

https://github.com/SufficientlySecure/document-viewer

It's dead but it works. Don't use on untrusted documents