: Right-click the file, select "Rename," and change the extension from .zip to .sb3 .
An .sb3 file is the native file format for . While it looks like a single specialized file, it is actually a "compressed archive." If you were to peak inside an SB3 file, you would find:
This will extract the contents of the ZIP file to a folder called output .
You do not need specialized conversion software; you only need to change the file extension. convert zip to sb3
Windows will warn you that changing the extension might make the file unstable. Click to confirm. Open Finder and locate your ZIP file.
Ensure your file isn't accidentally named project.sb3.zip . Turn on file extensions in your operating system settings to see the true hidden extension.
Developers, educators, and advanced Scratchers frequently move files between these two formats for several reasons: : Right-click the file, select "Rename," and change
Click on the file name to rename it, delete the .zip extension at the end, and type .sb3 instead (e.g., change my_game.zip to my_game.sb3 ).
: The most critical file. This contains all the blocks, code, variables, and structural data of your Scratch project written in JSON text format.
An file is the standard file format for Scratch 3.0 projects. It is essentially a compressed ZIP file that holds two main types of data: You do not need specialized conversion software; you
Set the target output format dropdown to (if explicitly supported) or use an archive conversion pathway.
: Scratch names these assets based on their MD5 hash to ensure uniqueness within the project. 2. Why the Conversion is Necessary
When Scratch opens an .sb3 file, it expects to see the project.json file and asset files in the root directory.
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.
Have questions or run into a tricky conversion? Leave a comment below or ask the Scratch community – they’re always happy to help.