The two dimensions that are currently supported in Boords are 16:9 and 1:1. 

We recommend that you upload images in these dimensions for best results, although other formats will be resized appropriately.

File size:
The maximum file size is 2MB. This applies to images uploaded into the frames and to the image you can upload for display on the front page of the PDF (i.e. instead of the Boords logo).

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