If you’ve ever tried to open a Scratch project only to find a folder full of JSON files and random assets instead of a playable game, you aren’t alone. Many users accidentally end up with a ZIP file when they meant to have an .sb3 file.
Once the new .zip is created, follow the renaming steps in Method 1 to change the extension to .sb3 . Method 3: Using Online Conversion Tools convert zip to sb3
Highlight the items inside the folder (Ctrl+A or Cmd+A). If you’ve ever tried to open a Scratch
Right-click and choose or Send to > Compressed (zipped) folder . convert zip to sb3