kjandoc

i needed something to combine multiple .pptx files, i couldn't believe pandoc can't do that, so here's a creative attempt using OOXML manipulation to do it.

what it does

merges multiple .pptx files into one
preserves full editability, with 99% fidelity to the original formatting (some minor quirks may occur)
copies slide masters, layouts, themes, notes, and embedded media
pandoc-style usage: kjandoc input1.pptx input2.pptx -o combined.pptx

why this exists

pandoc is great, but it can't concatenate .pptx files.

this works directly at the OOXML/ZIP level: it reads each .pptx as a ZIP archive, rewires all internal XML relationships, and writes a new near full Microsoft-compliant .pptx.

a final LibreOffice normalization pass cleans up any lingering structural quirks to prevent PowerPoint repair prompts (not guaranteed though).

usage

# pandoc-style usage
./kjandoc input1.pptx input2.pptx -o combined.pptx

# merge more than two
./kjandoc a.pptx b.pptx c.pptx -o combined.pptx

deps

python3
libreoffice (for the normalization pass)
python deps in requirements.txt (lxml)

notes

output slides are fully editable
masters and layouts from all source files are carried over
duplicate media files are deduplicated automatically