Note: Ensure the file structure matches Scratch 3.0’s expectation—assets must be referenced correctly in the JSON. Best Practices for Successful Conversion
Here are the steps to convert ZIP to SB3 manually:
This is the standard way to "convert" a zip to an sb3. Zip To Sb3 Converter
Scratch 3.0 cannot read raw Scratch 2.0 files without conversion.
To ensure the Scratch editor can read the file, the internal structure must be correct. The project.json file and all assets (like .svg or .wav files) must be at the of the archive, not inside a subfolder. Note: Ensure the file structure matches Scratch 3
Advanced users can open the project.json file inside the ZIP archive to change variables, fix bugs, or optimize code strings directly.
If you try to upload your converted .sb3 file to Scratch and receive an error message, it is usually caused by one of three common mistakes: To ensure the Scratch editor can read the
The sb3 Python package offers a dedicated parser for SB3 files. Here's a basic example:
A is a utility designed to take a zipped folder—usually containing a project.json file, along with sounds (WAV/MP3) and images (SVG/PNG)—and repackage them into a single, executable .sb3 file that Scratch 3.0 can open and run. Understanding the Formats
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If assets (sounds/images) were corrupted during the creation of the zip, the SB3 will not load.