Merge multiple jpg into single pdf in Linux

Question

I used the following command to convert and merge all the jpg files in a directory to a single pdf file.

convert *.jpg file.pdf

Th

Answer 1

All of the above answers failed for me, when I wanted to merge many high-resolution jpeg images (from a scanned book).

Imagemagick tried to load all files into RAM, I therefore used the following two-step approach:

find -iname "*.JPG" | xargs -I'{}' convert {} {}.pdf
pdfunite *.pdf merged_file.pdf

Note that with this approach, you can also use GNU parallel to speed up the conversion:

find -iname "*.JPG" | parallel -I'{}' convert {} {}.pdf