Convert Zip To: Sb3 [exclusive]

: Right-click the file and select Rename . Change the ending from .zip to .sb3 . If you don't see the extension, enable "File name extensions" in the View tab of File Explorer.

Change the file extension from .zip to .sb3 using the steps outlined in Method 1. On Windows (Using 7-Zip or WinRAR): Enter your asset folder and select all files ( Ctrl + A ).

: Right-click, select "Send to" > "Compressed (zipped) folder". macOS : Right-click, select "Compress [X] items".

Do not compress the parent folder itself. You must compress the files inside the folder. convert zip to sb3

If Scratch crashes while saving, the project file might become unreadable. By renaming the .sb3 to .zip , you can often open the archive, extract the project.json file, and manually repair the JSON syntax to rescue your work.

If you have ever downloaded a project from the Scratch website (scratch.mit.edu) or received a game file from a friend, you might have noticed two distinct file types: and .zip . At first glance, these seem completely different. One is a playable project file; the other is a compressed archive.

This almost always means you zipped the outer folder instead of selecting the files inside the folder before compressing. Re-do Method 2 and ensure project.json sits at the very root of your ZIP archive. : Right-click the file and select Rename

The Ultimate Guide to Converting ZIP to SB3: Unlock Your Scratch Projects

The most reliable method requires no third-party software or internet connection. You simply use your operating system's built-in compression utility. On Windows: Open the folder containing your target .zip file.

If your file is named game.sb3.zip , your operating system is hiding extensions. Ensure you turn on "File name extensions" in your OS settings to completely strip away the .zip suffix. Change the file extension from

Why? Because an SB3 file can contain JavaScript inside project.json (via "extension" blocks). A malicious actor could theoretically embed harmful code that exploits an old version of the Scratch app. Always scan ZIP files with an antivirus before renaming them to SB3.

, costumes, and sounds), you can convert it by manually changing the file extension: Locate your ZIP file in your computer's file explorer. Right-click the file and select Change the extension project.zip project.sb3 Confirm the change