Créer un favicon online
1/ Go to https://www.favicon-generator.org/
2/ Click on "browse button" to upload your picture which will be your favicon
3/ Click on the Create Favicon Button
4/ After generating a favicon with this tool download and save to the root directory of your site. Then include the following code in the head of your HTML document.
5/ Click on the link: Download the generated favicon
6/ Uncompress and upload all on your root web directory
7/ That's all!