We support PowerPoint (ppt, pptx, pps and ppsx), OpenOffice (odp format) and PDF equally well.

Mac users using Keynote can upload the .key package as a zip file, or save as PDF. If you are using Keynote09, you can directly upload the .key file.

If your uploaded presentation (ppt, pps, pptx, ppsx or odp format) does not look the same as the original, (e.g. fonts look awry, or some visual detailing is incorrect), then consider saving file as PDF and uploading that  instead.