Convert ZIP to JAR — Turn a .zip Into a Working .jar File

Rename a ZIP to JAR, check it has the right structure, and confirm it works. Covers Minecraft mods that download as .zip and when renaming is not enough.

Step 1: Look inside before renaming

Step 2: Rename the file

Step 3: Confirm the JAR is valid

Minecraft mods that download as .zip

When renaming is not enough

Summary