If you are looking for specific, reliable, and up-to-date converter links, many are found within the Scratch Forums under "Advanced Topics". If you'd like, I can: of a project.json file. Show you how to use the TurboWarp packager specifically. Help you troubleshoot a specific file that won't convert.
If you put your files into a folder named "MyProject" and then right-clicked and zipped that folder, Scratch will fail to read it. Scratch expects project.json to be at the immediate root of the archive, not buried inside a sub-folder.
You are moving projects between different offline editors or computers. Top Zip to SB3 Conversion Solutions (2026) Zip To Sb3 Converter
When choosing a Zip to SB3 converter, consider the following factors:
If your project.json file references a costume named costume1.svg , but that file was deleted or renamed inside the ZIP folder, the project will fail to load. Ensure all assets match their exact cryptographic hash names listed inside the JSON code. Frequently Asked Questions Can I convert an SB3 file back to a ZIP? If you are looking for specific, reliable, and
Because an .sb3 file is inherently a ZIP file, you do not actually need third-party software to convert it. You can do it manually by changing the file extension. On Windows: Open . Click the View tab at the top menu. Check the box for File name extensions . Locate your .zip file. Right-click the file and select Rename . Change .zip at the end of the filename to .sb3 .
: Manual edits to the JSON file can sometimes corrupt the project, so it is recommended to keep backups before converting. Quick Comparison of Conversion Options Manual Renaming Online Tools (e.g., ezyZip) TurboWarp Packager Ease of Use Fast, but requires file extension visibility enabled. Very easy; drag-and-drop interface. Best for exporting to other formats. Privacy 100% (Local) High (Browser-based processing) High (Local/Browser) Best For Quick inspections. Non-technical users. Packaging games for distribution. json file inside an SB3 to change project variables? Convert .zip to .sb3? - Discuss Scratch Help you troubleshoot a specific file that won't convert
The master text file containing all the blocks, code, scripts, variables, and definitions for your sprites.
To open these compressed files back up in Scratch, you need a .
If you have a collection of Scratch project files in a folder or a