Ensure the output format dropdown is set to SB3 .
Once you have the new .zip archive, rename it to .sb3 as described in Method 1. Method 3: Using Online Tools
// Load your project assets const project = new sb3.Project(); convert zip to sb3
You don’t need expensive software or a fancy converter tool. You just need your operating system.
Navigate to your newly created .sb3 file, select it, and click . Ensure the output format dropdown is set to SB3
: A developer may have unzipped an SB3 file to manually edit the project.json
: Change the filename from Archive.zip to ProjectName.sb3 . You just need your operating system
Delete zip from the end of the filename and replace it with sb3 . For example, change my_game.zip to my_game.sb3 .
If Scratch displays an "Application Error" or fails to load your file after conversion, check for these common mistakes: