With so many platforms and icons, it's hard to know exactly what you should do.
What are the dimensions of favicon.ico? How many Touch icons do I need?
RealFaviconGenerator did the reseach and testing for you. Each platform comes with its own design requirements. You can't just use the same picture everywhere. RealFaviconGenerator knows this and lets you craft your icons platform per platform.
How will Android display my icon? How will iOS round my Touch icon?
No more guesswork. RealFaviconGenerator instantly shows you how your icons will look like.
https://realfavicongenerator.net/
Do you want to upload an image larger than 2mb of size? Do you only need a favicon for your website, but not for apps? Try this one:
https://www.websiteplanet.com/de/webtools/favicon-generator/