First I'll tell you a service, but the reason for the answer is to explain something about favicons that might be useful to you.
"Hosting" (Host) favicons
Finding this link , in addition to "hosting" it also converts your image to icone.
Icons and Images as favicon
Old browsers used to use only .ico , this when supported, because there were browsers that could not support, so the preference was always to use this format, however most modern browsers as you can see in the list support png: link
Inotherwords,.icoisnolongertheonlyoption,youcanhostdifferentwebsitesorusedifferentdomainstostore.pngimagesandpointthemtoyoursite:
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<linkrel="icon" type="image/png" href="http://3rd.site.com/img/favicon.png">
Safari and the favicons
You may have noticed that favicons are not available in Safari for iOS, not even the .ico format, however Safari has a link tag for icones when you save to favorites or to "Home" and is compatible with many versions of Android, are the tags:
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<link rel="apple-touch-icon" href="icone-grande.png"> when adding to favorites or adding to Home (next to applications)
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<link rel="apple-touch-icon-precomposed" href="icone-grande.png"> o -precomposed causes the icon does not get the effect of "gloss" icon.
Images should be PNG as per the documentation in>>, these icons look similar to this (example using the Youtube site) in Home (left) and at the time of adding favorites or the "reading list" (right):
Note:ActuallyIthinkitdoesrecognize<linkrel="icon"> , although caniuse say no, but the image is "ugly", however it works least where I tested) if you do not have apple-touch-icon defined.
