How to Change Your Minecraft World Thumbnail / Icon!
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Picmonkey Photo Editor: https://www.picmonkey.com/#edit
Minecraft cool text generator: http://textcraft.net/
Convert to PNG: http://image.online-convert.com/conve...
All you have to do is go to C:\Users\(USERNAME)\AppData\Roaming\.minecraft\saves\(YOUR WORLD FOLDER NAME) then the file name "icon" is what you want to change. Use a photo editor to make your own cool image where resolution is 64 x 64, image type is PNG, and file name is "icon". Replace your custom PNG image with the other "icon" image and BAM! You get your thumbnail!