Here are three services you can use in 2020 onwards.
See the Example.
Example:
HTML
<img height="16" width="16" src='https://icons.duckduckgo.com/ip3/www.google.com.ico' />
<img height="16" width="16" src='http://www.google.com/s2/favicons?domain=www.google.com' />
Confidently use Icon Horse and get bulletproof favicons with fallbacks if no icon exists.
Example:
HTML
<img height="200" width="200" src='https://icon.horse/icon/horje.com' />
See the Example.
Example:
HTML
<img height="200" width="200" src='https://icon.horse/icon/horje.com' />
<img height="200" width="200" src='https://icon.horse/icon/youtube.com' />
</br>
<img height="200" width="200" src='https://icon.horse/icon/facebook.com' />
<img height="200" width="200" src='https://icon.horse/icon/twitter.com' />