When we are going to get an image from Pixabay, the chosen image resolution may causing the site to show the reCAPTCHA pop-up box to verify that we are a human and not the robots. The site itself is offering users the 4 different image size and capacity (different resolution). The first resolution is the lowest and we can get the image right away when hitting the download button. Meanwhile for the second and third resolution, base on my experience, almost 100% the reCAPTCHA box will be displayed and we should getting through the process before start downloading. Different with the last option which is the highest image resolution, we will have to login to the site to get it.