A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Graphic export options are limited in PowerPoint for iPad, and JPEG format is not directly available.
If your presentation is on OneDrive, you can open it in PowerPoint for the web in a browser. Then use File>Save As>Download as Images to save the presentation as a set of JPEG files. Then pick the one for the slide you want and discard the rest.
In PowerPoint for iPad, you can tap on the down-pointing arrowhead button beside the file name (upper left corner), then choose Export and save the file as a PDF. Some applications (like PowerPoint for Mac) accept PDF as a picture format. Or you can use third-party software or a conversion web site to convert to JPEG.
You can also tap on the three-dot icon at the right end of the Ribbon, then choose Create GIF. This is make an animated GIF. You can use this as an ordinary graphic in apps that don't play the animation, like Word for iPad. Or you can convert to another format using third-party software or a file conversion web site.
For more format options, use a desktop edition of PowerPoint for Windows or for Mac.