Next Steps: Now that you have your SB3 file, why not explore to compile it into a standalone HTML5 game or a Windows executable? The power of Scratch isn't limited to the browser—it starts with a single .sb3 file.
In the ever-evolving world of visual programming, Scratch remains the gold standard for introducing kids and adults alike to the logic of coding. Created by the MIT Media Lab, Scratch uses a drag-and-drop interface that makes programming accessible. Zip To Sb3 Converter
import zipfile import os def zip_to_sb3(input_zip_path, output_sb3_path): with zipfile.ZipFile(input_zip_path, 'r') as zip_in: with zipfile.ZipFile(output_sb3_path, 'w', zipfile.ZIP_DEFLATED) as zip_out: for item in zip_in.infolist(): # Skip macOS metadata if '__MACOSX' in item.filename or '.DS_Store' in item.filename: continue data = zip_in.read(item.filename) zip_out.writestr(item.filename, data) # Ensure the extension is .sb3 if not output_sb3_path.endswith('.sb3'): os.rename(output_sb3_path, output_sb3_path + '.sb3') Using adm-zip : Next Steps: Now that you have your SB3
Ensure your unzipped folder contains a valid project.json at the root level. All assets must be referenced correctly inside this JSON. Created by the MIT Media Lab, Scratch uses
// Write out as new SB3 (which is still a zip) const newSb3 = new AdmZip(); entries.forEach(entry => { if (!entry.entryName.includes('MACOSX')) { newSb3.addFile(entry.entryName, entry.getData()); } });