How it works
Sizes from the platforms' own pages, a cropper that runs on your device.
The sizes
Every size on this site comes from the platform's own help or support pages, never from another size guide. We use the platform's own word for it: recommended, minimum, ideally, or the size it is shown at. Where a platform states nothing, the table says so. We read every source again each month; the date is on every page.
The cropper
Your browser opens the photo, a small open face detector (YuNet, MIT licence) finds your face on your own device so the crop starts around it, and a canvas makes the file you save. The only file the page downloads is the face detector, from this site. The site tells your browser to refuse connections to any other address, so the photo cannot leave your device.
Who makes it
Made by Dewshot, a natural photo retouch. The site is free and has no cookies, no trackers and no advertising.