For mods that add new items, tools like the (web-based, free tier) can help.
A: As with any file conversion or tool usage, there are risks. Always prepare backups and use trusted sources. convert jar to mcaddon free
If your .jar is primarily a resource pack (textures/models) rather than complex code, you can sometimes "convert" it by changing the file extension: For mods that add new items, tools like
.mcaddon is simply a renamed .zip containing: For mods that add new items