Because the structures are identical, "converting" usually just requires changing the file extension or packaging the assets correctly. Method 1: The File Extension Swap (Fastest)
This happens when file extensions are hidden by your operating system. If your file is named project.sb3.zip , Scratch will not recognize it. Ensure you have enabled file extensions in your system settings so you can completely strip away the .zip tag. convert zip to sb3 updated
Scratch requires standard ZIP compression. If you used advanced compression algorithms like 7z or RAR and simply renamed the extension to .sb3 , Scratch will throw an error. Ensure that your compression software (like 7-Zip or WinRAR) is specifically set to output the format before changing the extension. Ensure you have enabled file extensions in your
# Decode the contents decoded_contents = zip_contents.decode('utf-8') Ensure that your compression software (like 7-Zip or
: High-fidelity SVG or PNG files for costumes and WAV or MP3 files for sounds, typically named using an MD5 hash (e.g., b12...svg ).
ezyZip provides a secure, locally-processed tool that doesn't require uploading files to a server, making it ideal for large projects or privacy-focused users. Go to the ezyZip converter page.
Several JavaScript libraries provide programmatic manipulation of Scratch project files: