Sirv
On page with 5 columns, 230×230
On Page with 4 columns, 250×250
On Modal or Popup
Imgix
On page with 5 columns, 230×230
On Page with 4 columns, 250×250
On Modal or Popup
Optimized by WordPress
Small size, 300×300
On Modal or Popup 768×768
Without filters
On Modal or Popup as is
On Modal or Popup 768×768