Uploading a custom skin in Minecraft may sometimes trigger the error message: "Skin images must be 64x64 or 64x32 pixel PNG ...

For instance, you can check the skin image's properties to see whether it is 64x64 and under 1 MB. Furthermore, you can re-check whether your skin looks blurred or in a weird shape when it opens ...

CDsmythe's main page for one of its skin compilers (Image via CDsmythe) Fortunately for players, there are a large number of simple-to-use skin compilers that can be found online.