Do you know where is this app?

Question

I m going to read some books(pdf format) on my android device. i am looking for a kind of app that can do this thing
"zoom-in, zoom-out with responsive page(without page margins)
Although i tried dozens of them but none of them work as what i mentioned
currently i hv "ReadEra" its better than others but it lacks one ability
it can only do "skip page margins" but can't do zoom-in zoom out for content after skip page margins(i want the zoomed in or out content be responsive or without margins)
U can say i am looking for something similar to the amazon kindle app

Answer 1

I use Polaris Office,
good performance and low ram usage makes it a good app.
but it can't remove margins... (as far as I know)

Answer 2

the one u currently using ebookdroid
it's already in my device as n alternative
I like the ui of it
thanks 4 the help I will go through it later