Yes, Zillow Rental Manager only accepts .JPG, .PNG, .BMP and .GIF files. To find out if your photos meet the criteria, right-click (ctrl-click on Macs) on the file and select Properties.
For syndication to Zillow, photos need to be at least 330(W)x220(H) to be accepted. Photos must also be under 10mb.
Please see our additional Photo Tips.