If you can tell me (e.g., did you export it from TurboWarp, or did you download it from a website?), I can tell you the exact steps to take .
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.
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This comprehensive guide explains why these formats connect, how the conversion works, and the best tools to use. Understanding the Formats: What is a .sb3 File?
Tools like or Scratch Addons sometimes export projects as unpacked folders for debugging. The converter brings them back into a single, shareable SB3 file. Zip To Sb3 Converter
import sb3
When the operating system warns you that changing the extension might make the file unstable, click Upload to Scratch
Before understanding the converter, you have to understand the container. Since Scratch 3.0 launched in 2019, project files have carried the .sb3 extension. But unlike the old .sb or .sb2 binary formats, the SB3 is a wolf in sheep’s clothing.
A common archive format that compresses multiple files into one. In the context of Scratch, a Zip often contains the raw .svg , .png , and .wav files that make up a project. If you can tell me (e
Select all your project files ( project.json and asset files), right-click, and choose .
The JSON file contains references to costumes and sounds by their filenames. If you modify these filenames or their MD5 hashes, you must ensure the corresponding assets exist in the archive with matching names.
If you want to troubleshoot a specific project that will not load, tell me: What are you seeing? Was the project originally created in Scratch 2.0 or 3.0 ? Which operating system are you currently using?
An .sb3 file is not a unique, unreadable piece of binary code. It is a renamed ZIP archive containing all the raw assets of your project. If you change the file extension of any .sb3 file to .zip , you can extract it using standard compression software (like WinRAR, 7-Zip, or Mac Utility) to see exactly what makes up your game. Inside a standard Scratch project folder, you will find: This public link is valid for 7 days
file, these assets are often stored with MD5 hash names (e.g., b7cf...svg
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?
Open File Explorer and ensure extensions are visible (Check > Show > File name extensions ).