Minecraft Education edition can only import skins using a skinpack not just a skin image. So you can either download a skinpack from cdsmythe.com or create one using this online Minecraft Education edition Skinpack creator tool. Start by getting a Minecraft skin - Create or download a custom skin image online from www.minecraftskins.com or planetminecraft.com, then using this form fill out the name for your Skin, name for your Skin Pack, and a Skin version number then upload your custom skin image file as a ".png".
If you want to add more skins to your pack, select "Add another skin", otherwise press "Download Pack" to download your skinpack.
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Once you have downloaded your skinpack you can right click the mcpack file and choose Open with... Minecraft Education. You can download, edit and create Minecraft skins and download the PNG files to use in this Skinpack Creator tool from Planet Minecraft .
Premade skinpacks are available on my website cdsmythe.com/minecraft-education-skinpacks .
*This web application is not endorsed by or affiliated with Mojang, Microsoft or Minecraft