On Android, I use an reader app called "MJPDF" to do this.
this post was submitted on 23 Jun 2024
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Sioyek also does this
Highly recommend, esp. if you like using vim keybinds (you abviously don't have to, but IMO it's a fantastic feature)
Zathura lets you theme your pdf files.
Evince (the standard GNOME pdf reader) has night mode that you can toggle with "Ctrl + i" by default.
I use Okular and sometimes Zathura, both can do that through hotkeys (you can also add a button to the toolbar in Okular)
In Okular (for desktop), you can set keyboard shortcuts for various color inversion/shifting modes. Or you can permanently set one in the Accessibility settings.
Not FOSS but free - ReadEra, it's working extremely well. No ads or anything, the only feature the paid version has is cloud sync of your library, and sync reading progress across devices.
Been using it for 8 years or so, bought it at some point just because it works without a hitch since basically forever.
Librera on Fdroid will, but it's a bit unpredictable. It works well enough most of the time
If we're talking Android, I can recommend MJ Pdf 100%.
OP might be asking for desktop apps
Yeah I wasn't sure, but the first pdf reader I thought of was librera. Pretty sure Okular can do it too. Normally the "dark mode" is just inverting the colours since printed pdfs are normally black text on white paper.