Right-click the highlighted files and select Compress to ZIP file (Windows 11) or Send to > Compressed (zipped) folder (Windows 10).
Download the converted .sb3 file directly to your device and load it into Scratch.
If you have a folder full of Scratch project files (like project.json , sounds, and costumes) zipped together, you might think simply renaming the .zip to .sb3 will work. Sometimes it does. Often, it fails.
file is in the root of the ZIP folder, not inside a subfolder. Rename Extension : Right-click your file and rename the extension to Confirm Change convert zip to sb3 fix
If project.json references an asset name that does not exist in the ZIP directory, the project will crash on launch.
Convert ZIP to SB3 Fix: How to Restore Corrupted Scratch Projects
How to Convert ZIP to SB3 (and Fix Common Errors) Scratch is an excellent platform for creating games, animations, and interactive stories. However, managing Scratch project files can sometimes be frustrating. If you have downloaded a Scratch project or compressed one yourself, you might end up with a .zip file instead of the native .sb3 format. Trying to upload this ZIP file directly to Scratch will result in an error. Right-click the highlighted files and select Compress to
: Specifically designed to extract Scratch projects from various formats, including ZIP and HTML. TurboWarp Packager : Useful for converting files into standalone files if your goal is distribution. sb3_extractor (GitHub)
cd /path/to/your/project_folder zip -r ../fixed.sb3 *
Select the file and press on your keyboard to edit the name. Delete .zip from the end of the name and type .sb3 . Press Return. In the prompt that appears, click Use .sb3 . Sometimes it does
Sometimes Windows or macOS hides file extensions. You might think you renamed your file to project.sb3 , but it’s actually named project.sb3.zip .
: The master text file containing all your Scratch blocks, variables, and code logic.
What does Scratch show when you try to load it?
File extensions are visible on your operating system before you rename. All audio assets are web-friendly (MP3 or small WAV).