Convert multipage PDF to a single image

Finally I find THE solution:

convert in.pdf -append out%d.png

Thanks to this post.

As a plus, the opposite operation is:

convert *.png output.pdf

or if you have foo1.png, foo2.png..fooN.png

convert foo?.png output.pdf

Notice that does not work with foo01.png, foo02.png..foo0N.png

linux image bash pdf imagemagick

+append will put images side by side, i.e. horizontally instead of vertically (with -append)

convert in.pdf +append out%d.png

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