# Rename to .sb3 sb3_path = output_path.with_suffix('.sb3') shutil.move(output_path, sb3_path) return sb3_path
Corrupted project.json is the #1 cause of failed imports. Use a JSON validator. Extra quality means checking: zip to sb3 extra quality
In the context of Scratch 3.0, . An .sb3 file is simply a ZIP archive that has been renamed with a different extension . "Extra quality" in this conversion usually refers to manually optimizing the assets (images and sounds) inside the ZIP before renaming it back to SB3 to ensure the project remains high-quality while staying within Scratch's file size limits . How the Conversion Works # Rename to