: The sound effects and music used in the project.
: Ensure project.json sits at the root level of the ZIP file. If it is hidden inside a subfolder within the archive, Scratch will not recognize the project.
This is the fastest method if your ZIP file is already a valid Scratch project. Since an .sb3 file is a .zip archive, often, the only thing you need to do is change its name.
This occurs when the file structure inside the ZIP file has an extra root folder. Ensure the asset files are not nested inside a subfolder when you compress them. convert zip to sb3 updated
: Click Yes when the warning about changing extensions appears. On macOS Locate your file : Find the .zip file in Finder. Rename : Click the file once, then press Enter . Change extension : Change the ending from .zip to .sb3 . Confirm : Click Use .sb3 in the pop-up dialog box. ⚠️ Important Troubleshooting
: Select all internal assets and the JSON file, then compress them into a standard ZIP archive.
Before starting the conversion, it helps to understand what happens under the hood of a Scratch project. An SB3 file is actually a renamed ZIP archive. If you change the file extension of any .sb3 file to .zip and extract it, you will find the following core components: : The sound effects and music used in the project
: Ensure all project assets (e.g., .svg , .png , .wav files) and the mandatory project.json file are at the top level of your folder—not inside a subfolder.
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while converting the ZIP back to SB3 and offers to rename the physical files inside the archive to match their in-editor sprite and costume names. This is the fastest method if your ZIP
This is a standard compression format. When you download a project bundle or share multiple assets together, they are often compressed into a ZIP folder to save space.
if your converted file is failing to open.
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