I’m currently using readera but it’s not that good (text scaling is behind a paywall)
Edit:the ability to put stuff into categories would be neat btw
librera
Librera Reader (Book and PDF reader) https://f-droid.org/packages/com.foobnix.pro.pdf.reader/
I’ve been using this a few months and recommend it as well. It’s serviceable but feels a bit janky. Scrolling and switching between view styles tends to leave black boxes on my device, and the UI doesn’t always disappear while scrolling. But I’d still recommend it for how light and fast it is on top of being FOSS
I’ve been using MuPDF for pdf’s and Libera for epubs, both on f-droid. Libera can also read pdf’s but for reasons I don’t remember, it wasn’t as usable for them as MuPDF is, at least for me. So I stayed with MuPDF.
That’s what I’m using:
https://gitlab.com/mudlej_android/mj_pdf_reader
I would advise to use open-source software wherever you can. You (almost) never have paywalls, ads or trackers there ;)
Firefox has a PDF reader built in these days.
Nah it’s crap on Linux too. Maybe not quite as bad. On Linux I generally use atril or xpdf these days.
MuPDF