October 6, 2019 at 8:05 pm #20527

Hi Lea,

Thanks for reaching out to us! The largest supported size is currently 16 megapixels, which is 4000×4000 (or any dimensions which multiply to less than 16 million).

This is 13.3×13.3″ at 300DPI.

Let us know if you have any other questions!

Regards – The Ribbet Team