For a ZIP-to-SB3 conversion to work, the ZIP must contain specific components in its root directory: project.json
The .sb3 file format was introduced with Scratch 3.0. Unlike earlier versions, it is a that bundles everything your project needs into one file. Inside a standard SB3 file, you will find: project.json : The core code and metadata for your project. convert zip to sb3
If your file is already a .zip file it was originally an SB3 (i.e., it contains a project.json file at the root), just rename it. For a ZIP-to-SB3 conversion to work, the ZIP