You can upload any number of (JPG, max 25MB/photo, sRGB color profile) photos to a tour/order. Minimum upload size should be at least 1680 pixels in width. Anything less may result in a blurry or pixelated photo.  The shortest picture edge cannot be shorter than 1000 pixels, the photo will be rejected. Photos taken in portrait mode can be uploaded but will be displayed cropped to horizontal on the property sites. In the Photo Gallery vertical photos will be displayed vertically. The platform processes the uploaded photos and stores them in multiple sizes for the most efficient display and quality, depending on the device used to view them. Images are stored for client retrieval in two sizes. Print Size = the full uploaded size, Web Size = 1680 x 1050.

If you or your local MLS requires specific photo sizes you can create these in your Affiliate Profile. They will be first shown under Brokerage settings where you make them available to your clients in the Media Access section by "enabling" them and setting a trigger.

Note! In most cases there is no need to shoot and upload photos in your camera's highest image size. This will only result in long upload and download times for you and your clients. Best setting is Medium / Standard and Fine Quality setting.
Helpful information about photo sizes, resolutions, dpi, etc.

https://www.webdesignerdepot.com/2010/02/the-myth-of-dpi/

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