Video
Supported video files:
MP4 with AAC codec for audio
Audio
Supported audio files:
MP3 and MP4A
Images
Supported image files:
JPG
PNG
PDF
GIF (non-animated only)
Other files
PDF for exporting your presentation
CSV, XLS, XLSX files for charts
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Note: If you have access to the PowerPoint converter, Prezi also supports .ppt (and .pptx) files.