Cool idea! I think it's very useful for people who want to share slides but don't want to share the entire pptx file.

I wanted to make a GIF of another user's Google Slide, but with the webapp it looks like I only have access to my own slides, and only google slides. I whipped up a quick API to generate a GIF of any Google Slide URL or of any PPTX file available on the web: http://159.203.37.136/

You can use the API like this: http://159.203.37.136/?url=xyz&delay=100 which would make a GIF of the URL pptx file. For example, it could be https://docs.google.com/presentation/d/13838392jfdjkfsd/edit... or https://scholar.harvard.edu/files/torman_personal/files/samp... or any ppt or pptx url of your choosing. It works with any public google slides too.

As a sample, you can try http://159.203.37.136/?url=https://scholar.harvard.edu/files...