Convert Zip To Sb3 [verified] Jun 2026

Introduced with Scratch 3.0, the .sb3 file format is the default file extension used to save Scratch projects locally. It contains everything your animation or game needs to run.

A ZIP file is a compressed archive file that contains one or more files or folders. ZIP files are commonly used to compress large files or folders to make them easier to share or transfer over the internet. convert zip to sb3

For advanced users, developers, or anyone frequently working with many projects, offline tools provide more robust capabilities. Introduced with Scratch 3

: Advanced programmers open the project.json file in a text editor to perform "JSON hacking." This allows you to create hidden blocks, inject bulk data into lists, or fix corrupted project variables that cause the Scratch editor to crash. ZIP files are commonly used to compress large

| Issue | Solution | | :--- | :--- | | | Ensure you're using a modern, updated browser (Chrome, Firefox, Safari). The conversion runs locally in your browser, so check your browser's settings to ensure it's allowing local file access for the website. | | Scratch fails to load my SB3 file | Your SB3 file might be corrupted or missing essential components. Try re-converting your ZIP file carefully, ensuring it contains a project.json file at the root level. Scratch will attempt to load .sb , .sb2 , .sb3 , and .zip files, but they must be correctly structured. | | The project.json file is missing from my ZIP | If you only have a folder containing the project files, compress the contents of that folder into a ZIP, then rename the extension to .sb3 . If you only have extracted assets, you'll need to rebuild the project in Scratch. | | My project is too large to upload | For online projects, Scratch has size limits for individual assets (e.g., each image or sound must be under 10MB) and the project.json file itself (under 5MB). To reduce file size, you can try shortening long lists, replacing large images with lower-resolution versions, or cutting lengthy sounds into smaller clips. |

Yes, surprisingly, the Scratch editor (online or desktop) can directly load some .zip files. In the editor, go to File > Load from your computer and select your ZIP file. Scratch 3.0 will attempt to load projects from .sb , .sb2 , .sb3 , and .zip files. This is the easiest method of all! If it works, you can then save the project normally as an .sb3 file.