You can only add photos to flat-to-let and flatmate wanted ads.
The resolution of the image you upload must be 72dpi.
Uploaded images must be of type .jpg (or jpeg) and have the appropriate file extension (this is a security measure).
Images that are too large will automatically be resized - the maximum height, or width is set to 200 pixels; if the image is already smaller than that it will not be resized.
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If you require a more detailed guide, you may find this article about using Photoshop to prepare photographs for the web useful.