GIMP Script-fu

sg-save-pdf-multi
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Command:
Export Multi-page PDF
Menu:
"<Image>/File/Create/Export Multi-page PDF..."
PDB Name:
script-fu-sg-save-pdf-multi
Download:
sg-save-pdf-multi.scm (after the page appears, click on the "Download" command)
License:
GPLv2+

Description:

Previous versions of GIMP (< 2.8) provided support for saving multi-page PDF files -- and that functionality still exists in the GIMP code! However, the menu option for the command has been removed (since the developers decided that editing multipage documents was not part of GIMP's illustrious "product vision").

One can gain access to this functionality by opening "Filters->Script-fu->Console" and typing the following command:

(file-pdf-save-multi 0 #(0) 0 0 0 0 "" "")

Alternately, this script can be installed and it restores the function into the menus (as "File->Create->Export Multi-page PDF...").

Don't forget to specify a filename and add your images. Unfortunately, settings are not remembered from previous uses.