Hide empty margins in pdf

Question

My screen is a bit small and dividing it in two vertically to see a pdf while editing it leaves a lot to be desired. However, if pdf-tools or pdf-view mode had the option to hide a % of the empty white margins for each page of the document it would fit just right. It is possible to do this?

PocketBook reader for android has this feature and you only see the parts of a pdf with actual characters on them.

bonus: It is possible to run pdf-view-fit-width-to-window automatically?

Answer 1

Here is my configuration of pdf-tools using use-package. The relevant part to answer this question is the hook of pdf-view-auto-slice-minor-mode. Alternatively, a one liner would be (add-hook 'pdf-view-mode-hook 'pdf-view-auto-slice-minor-mode)

(use-package pdf-tools
  ;; :after (quelpa)
  :ensure t
  :magic ("%PDF" . pdf-view-mode)
  ;; default page width behaviour 
  :hook ((pdf-view-mode . pdf-view-auto-slice-minor-mode)
         (pdf-view-mode . pdf-continuous-scroll-mode)
         )
  ;; use Ctrl+home/end keys to move to the first/last page
  :bind (:map pdf-view-mode-map
              ("C-5" . 'pdf-continuous-scroll-mode)
              ("<home>" . 'pdf-view-first-page)
              ("<end>" . 'pdf-view-last-page))
  :config
  ;; Print
  (setq pdf-misc-print-program "/usr/bin/lpr")
  (pdf-tools-install t)
  ;; Install pdf-continuous-scroll-mode
  (quelpa '(pdf-continuous-scroll-mode
            :fetcher github
            :repo "dalanicolai/pdf-continuous-scroll-mode.el")
          )
  (require 'pdf-continuous-scroll-mode)
  (add-hook 'pdf-view-mode-hook 'pdf-continuous-scroll-mode)
  )