"Hi Albert, thanks for the comment! There is no limit on the number of photos that can be dragged in at a time. I tested it with over 1,200 photos dragged at a time and it worked no problem. Picplum accepts jpg/jpeg/png/gif/tif/tiff at the moment. There is no max photo size, just a minimum of 20kB. The image you linked to doesnt load for me, but it sounds like you may have a 503 error we have a seen a few times and cant reproduce.. and seems to happen randomly regardless of browser or user. We're going to rewrite a lot of the uploader in the coming month that may fix it." - Paul Stamatiou