https://convert.to.it
convert anything to anything. not an AI tool! this runs locally in your browser and it has a bunch of built in conversions and a pathfinding tool to find the least lossy path to your output format. those conversions include cross-medium conversions, so you can convert an audio file to a png, a a png to a video, a video to a pdf document, or just ask for it to go directly from audio to pdf, and it'll find some way to do it!
source code:
https://github.com/p2r3/convert
high level overview:
https://youtu.be/btUbcsTbVA8