An .sb3 file, used for projects in Scratch 3.0, is technically a standard ZIP archive that has been renamed. Inside this archive, you'll find a project.json file that defines all the project's code, scripts, and data, along with folders containing all its media assets, such as costumes (in .png or .svg format) and sounds (in .wav or .mp3 format). This is why converting between the two formats is a simple process of renaming or repackaging.
Do not compress the parent folder itself. You must compress the files inside the folder. convert zip to sb3
Beyond simple conversion, understanding the ZIP-based nature of SB3 files opens up a world of possibilities for developers and advanced users. Because you can access the raw JSON and assets, you can build powerful tools that interact with Scratch projects programmatically. Do not compress the parent folder itself
If you're having trouble renaming an .sb3 file to .zip , the most common culprit is your operating system's settings. By default, Windows and macOS often hide file extensions. You will need to enable "Show File Extensions" in your file manager's settings before you can change the .sb3 part of the name. Because you can access the raw JSON and
Assuming files are in folder scratch_project/ with project.json and assets/: