Resolution and cropping rules for the favicon
Favicon will be visible to any visitor in their browser tab.
That logo should be 32x32 pixel size. The file should be a jpg, png, gif or .ico.
If the photo you upload isn't 32x32 pixel size, it will be resized automatically and taller images will be cut in the middle (top and bottom will be cropped).
To enjoy the best results, you should use the recommended size.
You can add an .ico file type in order to ensure visibility in different browsers. In particular Microsoft Edge seems to rely on this file type, but an .ico file should work in other browsers as well.