Here is a comprehensive list of all the design file dimensions you need to note while uploading your files.
ElementLocationDimensionsFormat and file size
Background imageBranding / Theme / Background image1920 x 1080 px.JPG, JPEG, PNG, GIF; up to 4MB
Event logoBranding / Theme / Navbar200 x 80 pxJPG, JPEG, PNG, GIF; up to 4MB
Virtual background imageBranding/ Virtual background image480 x 270 pxJPG, JPEG, PNG, GIF; up to 1MB
Background imageRegistration page(template 1)1345 x 1080 pxJPG, JPEG, PNG, GIF; up to 4MB
LogoRegistration page(template 1)200 x 200 pxPNG, up to 4MB
Cover logoRegistration page (template 1)600 x 600 pxJPG, JPEG, PNG, GIF; up to 4MB
Cover MediaRegistration page (template 2)1150 x 428 pxPNG, MP4; up to 4MB
Background imageLobby / Background image1920 x 1080 pxJPG, JPEG, PNG, GIF; up to 4MB
Intro videoLobby / Intro video1920 x 1080 pxMP4; up to 6GB
Background imageStage / Edit stage / Background image1920 x 1080 pxJPG, JPEG, PNG, GIF; up to 4MB
Intro videoStage / Edit stage / Intro video1920 x 1080 pxMP4; up to 6GB
LogoRooms / Logo200 x 80 pxJPG, JPEG, PNG, GIF; up to 4MB
Sponsor logoNetworking / Advanced settings / Sponsor logo overlay200 x 80 pxJPG, PNG; up to 4MB
Booth BackgroundExpo / Booth1920 x 1080 pxJPG, JPEG, PNG, GIF; up to 4MB
Zone thumbnailExpo / Add Zone1280 x 720 pxJPG; up to 1MB
Booth thumbnailExpo / Booth1154 x 600 pxJPG, JPEG; up to 4MB
Booth logoExpo / Booth200 x 80 pxJPG, JPEG, PNG, GIF; up to 4MB
Speaker imagePeople / Add Speaker / Speaker image300 x 300 pxJPG, JPEG, PNG, GIF; up to 4MB
Widget (image upload)Image widget, Carousel, Go to Button
JPG, JPEG, PNG, GIF; up to 4MB