Right-click (or Control-click) and select . A file named Archive.zip will be generated.
This tool is compatible with all major modern browsers across Windows, macOS, Linux, Android, and iOS, and it handles conversions with no file size limitations.
The "conversion" process does not require special software. It is simply a file renaming trick.
Since an SB3 file is a renamed ZIP archive, you can perform the conversion manually: convert zip to sb3
:
: 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.
: Allows you to drag and drop a ZIP file and extract or convert its contents specifically into the SB3 format. Right-click (or Control-click) and select
: Select all the internal components (the project.json file and all asset folders like costumes or sounds ).
Before you start, you must verify that the ZIP file contains the proper internal structure of a Scratch project. Use a program like WinRAR or 7-Zip (or your operating system's built-in extraction tool) to open the ZIP file without extracting it. Look for a file named project.json at the root level. If you see other folders or files directly inside the ZIP without a project.json file at the root, the conversion may fail, and you may need to repackage the files correctly (as outlined in the next section).
If you run into any issues during the conversion, tell me your and whether you are using the online or offline Scratch editor so I can provide targeted troubleshooting steps. Share public link The "conversion" process does not require special software
The table below summarizes the key differences and similarities between the two file types.
Since an SB3 file is natively a ZIP archive, the absolute fastest way to convert a ZIP to SB3 is by changing the file extension. On Windows
Now open the .sb3 file in (offline editor or upload to the Scratch website).