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Comment by mormegil | Hacker News Reader

I _think_ you want a feature where the reader removes any margins in the document for display. Basically, a "crop the paper format" function. And... yeah, I'd want my reader to have that! (And my Kindle! When sometimes reading a PDF, this would be great!) Does any PDF reader support something like that?

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In emacs with pdf-tools it seems you can enable a minor mode:

pdf-view-auto-slice-minor-mode

which does the trick. Just learned it.

EDIT: could try it. Exactly as intended. Will be of great help (I can now have a complete latex page in view with decent font size).

I've been using https://pypi.org/project/pdfCropMargins/ (and reporting bugs which have been fixed) to pre-crop my PDF files, so they work on all readers. I haven't tried PDF reflowing yet though.

GoodReader on iPad has this (though you set it for the document manually). It even lets you choose a different view-time crop for odd and even page numbers.

The ReMarkable tablet supports this natively. And, IIUC, the purpose of the margins is for notes; the ReMarkable also supports inserting blank pages into a pdf for note taking.

On Android, KOReader is able to do this (and free and open source). It can even reflow the text quite well so that it fits on a smaller display like a phone, if needed.

Skim pdf is a good option if you're on macOS: https://skim-app.sourceforge.io/

I think I’ve seen it on some desktop PDF software before, though I can’t think what, and the reMarkable can do it.

Okular (Linux/Windows) can do this

For Android, Librera is able to do that.

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