Converting a multi page pdf to multiple pages using a single command

Question

I want to convert multi page pdfs into single page images efficiently.

I already know how to do this one page at a time with imagemagick. For example,

Answer 1

When I tried to convert my multi-page pdf, the resulting image files had a gray background despite the pdf having a white background. (@John P commented on it on the accepted answer, but I couldn't get his comment to directly work for me.)

Here's what worked for me to make the background white:

convert -authenticate yourpassword -background white -alpha remove -alpha off -density 300 -quality 80 -verbose "Your file.pdf" "Your file.png"

My pdf had a password hence the authenticate. You can see a summary of the options here:

-authenticate value decipher image with this password

-background color background color

-alpha on, activate, off, deactivate, set, opaque, copy", transparent, extract, background, or shape the alpha channel

-density geometry horizontal and vertical density of the image

-quality value JPEG/MIFF/PNG compression level

-verbose print detailed information about the image

More detail: https://imagemagick.org/script/convert.php

And the alpha remove option: http://www.imagemagick.org/Usage/masking/#alpha_remove

Answer 2

You're missing the quantity of digits. Use:

convert x.pdf x-%04d.jpg

Where 4 means 4 digits will be show on the page count.

Answer 3

If you use Graphicsmagick on Debian or ImageMagick on macOS you probably have to add ADJOIN to your command. So it should look like

convert x.pdf +adjoin x-%04d.jpg

Answer 4

Ran into the same issue. Reinstall Imagemagick to work in Mountain Lion. If you use brew the simply

  $brew unlink imagemagick
  $brew install imagemagick