You are not making a single file. You are making a folder structure. Create a new folder on your desktop called MyAddon .
For simple mods—specifically those that add new items, blocks, or textures without complex new mechanics—automated tools are your best bet. Convert Jar To Mcaddon
You must manually recreate the mod’s features using Bedrock’s Behavior Packs (JSON/JavaScript) and Resource Packs . Tools for help: You are not making a single file
Java mods often use custom 3D models for mobs, blocks, and items. You can extract and convert these visual assets relatively easily. Extracting the Assets Download the .jar file you wish to convert. Change the file extension from .jar to .zip . For simple mods—specifically those that add new items,
.json files detailing the 3D geometry of custom items or blocks.
The most successful "conversion" is transferring visual and audio assets. MCADDON packs rely on a specific naming convention and folder hierarchy.
Historically, these two worlds never mixed. Java mods rely on complex Java code; Bedrock add-ons use a completely different scripting language (mostly JSON and JavaScript). However, as the demand for cross-platform parity grows, tools and methods have emerged to "bridge" this gap.