Which format do I have to use?

Hi Andreas!

If you have the source (in SVG) of those three icons, I really recommend to convert them to a font using Fontello and then add the pack to Menu Icons. This way, you’ll get the same result as the bundled icons.

Otherwise (if you only have PNG icons), then you can only use the “Image” type to add them to your menu items, which won’t look very good on Hi-DPI screens.

I do own the original svgs, Dzikri Aziz!
THANKYOU fast answer and the tipp ?? i tried it and got a zip file to download. donot know whether it worked. But to find i out: how do I add a font to Menu Icons??

plus do you have an idea HOW I can bring such vectorfiles (with the same svgs) in a much bigger size? I tried to insert the svgs directly but my uploading software tells me I am not allowed to upload this filetype… so I had to -aain make it a png. But thats certainly not really good. see yourself:
https://LernenDerZukunft.com the three big buttons

thank you in advance mr awesome. I am really excited
Andreas

To add a Fontello icon pack, please follow the How do I add an icon pack from Fontello? guide in the FAQ section. You can use an FTP client of your choice to upload the extracted icon directory to your server.

By default, WordPress doesn’t allow you to upload SVGs. To be able to, you need to install a plugin such as SVG Spritemap.