Converting a JAR file to an MCPACK file is a common task for Minecraft players looking to port Java Edition mods, skins, or resource packs over to the Bedrock Edition. While these two versions of the game use different coding languages—Java and C++ respectively—you can often bridge the gap with the right conversion steps.
If your JAR file contains textures (a resource pack), you can manually convert it by following these steps: convert jar to mcpack
For those who prefer a more automated approach, several community-driven websites can handle the heavy lifting for you. Converting a JAR file to an MCPACK file
Change the resulting .zip file extension to .mcpack . Method 2: Using Online Conversion Tools convert jar to mcpack