cbz2pdf

I wrote this script because all the other solutions I could find either required uploading files to sketchy websites or learning how to toleratelearn Calibre's interface.

This will work as long as img2pdf is installed and in your PATH.

Also, I haven't tried using this in any other shell than bash, but if you use a different one, you are probably knowledgeable enough to edit this to suit your needs.

Usage

cbz2pdf works on one file at a time and can take up to three positional arguments:

• The input file (required)
• The author (optional)
• The title (optional, will use the input filename without the extension when omitted)

The author and title metadata is used by readers such as Apple Books.

To convert a single file

cbz2pdf "input.pdf" "The Author" "A Descriptive Title"

To convert multiple files at once

As mentioned above, this script only works on one file. To convert multiple files at once, I recommend making use of other Unix tools like find.
For example, if you have a directory full of correctly named CBZ files and they all have the same author, you can do this:

find . -type f -name "*.cbz" -exec cbz2pdf "{}" "The Author" \;

This will convert all files in order, adding "The Author" as the author and using the filenames for the titles.