All you need to upload the input file and target your output format.
The online converters do not any require signups. Basically, you can convert your presentation slides into a video. Using these websites, you can convert PowerPoint formats ( PPT, PPTX, PPS, PPSX) to MP4 format.
The online converters are quite convenient to quickly convert files for free. The blog post covers free online PowerPoint to MP4 converter websites.