What does Pinterest say about Pin sizes?

What does Pinterest say about Pin sizes?

Pinterest has been saying for years that the optimal Pin size is a 2:3 proportion. For quite some time, that topped out at 736 x 1104 pixels, but they’ve scaled down the size of the Pin when clicked. Now a 2:3 Pin will never appear larger than 564 x 846. Pinterest says 600 x 900 pixels is optimal – or any 2:3 aspect ratio.