For Audio Ads:

• Length: 15 seconds [recommended] or up to 30 seconds 
• File types: WAV, MP3, OGG
• Max file size: 1MB
• Audio: WAV - 16-bit 44.1 kHz MP3, at least 192 kbps RMS normalized to -14 dBFS Peak normalized to -0.2 dBFS

Image companion 

• Dimensions: 600 x 600 pixels
• File type: JPEG or PNG
• Max file size: 200KB

For Display Ads:

• MPUs: 
• 600x600 pixels
• 600x500 pixels
• Interstitials:
• 320x480 pixels
• 640x960 pixels

File type: JPEG or PNG
File size: 200KB

HTML & GIFs are currently not supported. 

For Video Ads:

• Dimensions: 
• Horizontal: 640x360 or 1280x720
• Vertical: 720x1280
• Length: Up to 30 seconds (recommended 15 seconds)
• File types: MP4
• Max file size: 5MB