Convert Zip — To Sb3

The Verdict: It’s Not a "Conversion," It’s a Rename

First, it is important to understand that an .sb3 file is technically already a Zip file. It is a compressed archive containing a project.json file and various asset files (images, sounds).

Method 3: Manual Extraction and Import

If you prefer a more manual approach:

Hidden Extensions: If you don't see the .zip suffix, you may need to enable "File name extensions" in your computer's folder options. json file inside the ZIP before converting it back to SB3? Convert .zip to .sb3? - Discuss Scratch convert zip to sb3

"Failed to Upload": If Scratch rejects the file, check that the project.json is at the very top level of the archive and not inside a subfolder.

macOS / Linux (Terminal):

1. Incorrect Internal Structure

Error: “Unable to load project” or infinite loading. Fix: Ensure project.json is at the archive’s root, not inside a subfolder. Unzip, rearrange, and re-zip using Method 2.

Converting between the two formats is typically done for the purpose of manually editing project assets or code. Converting ZIP to SB3 The Verdict: It’s Not a "Conversion," It’s a

Introduction