The file extension is the standard format for Scratch 3.0 projects. Structurally, an .sb3 file is actually a renamed ZIP archive containing the project’s assets (images and sounds) and a project.json file that defines the code.
: If your operating system warns about changing file extensions, click "Yes" or "Use .sb3". 2. Online Converters
If you have unzipped an SB3 to edit its contents, or if your ZIP contains a folder with assets, follow this method.
This is a universal compression format used to bundle multiple files together. convert zip to sb3
Save as convert.py and run in the folder with your ZIPs.
: Right-click the file and change the .zip suffix to .sb3 .
by dragging into the Scratch editor.
import os import zipfile import shutil
You extracted the SB3 file to manually swap out a sound file or edit a costume image using advanced external software like Photoshop or Audacity.
: Do not zip the parent folder itself. Instead, select all the files inside the folder. The file extension is the standard format for Scratch 3
Happy Coding!
If you actually extracted the contents of an SB3 file into a folder, edited the internal assets, and now want to compile those loose files back into a working .sb3 project, follow these precise steps. Step 1: Select the Internal Files (Not the Root Folder)
The easiest way to convert a ZIP file to SB3 is by using the Scratch website. Here's how: Save as convert