Open multiple images and save them as one ODF or PDF file

Missing feature!

Open all images from a given directory - select and auto order them as sequence of pages in one ODF file and/or export them as PDF.

Simply Combine / Merge multiple images into one file.

This feature exists in LibreOffice since the 4.1 branch. It is not included in Writer. A sequence of images makes more sense in a presentation. So this is included in Impress.

Open Impress, click on menu Insert > Image > Photo Album, select all the images you want from as many folders as you wish. Re-order them (manually) if they are not in the order you wanted. Choose how many images you want per slide and click on Insert Slides.

You can save the presentation to make modifications later or simply go to File > Export as PDF

IN LO 7 go to Insert → Media → Photo Album. Impress Photo Album

I know this doesn’t really address your feature request, but I find GIMP quite useful for making PDF documents - you can import images as layers, then make them into a pdf easily.

The problem with GIMP’s PDF exportation is it saves each pic as a separate page, which at least in Foxit Reader makes the PDF not readable in continous mode. This is true with GIMP 2.8.16 and Foxit Reader 7.2.8.1124.