Converting Zip files to SB3 extra quality allows you to:
Always prefer SVG over PNG, as it reduces file size while providing better scaling.
Converting a ZIP to an SB3 file is a technical formality, but ensuring "Extra Quality" requires attention to the contents. By verifying that your JSON is UTF-8 encoded, your image assets remain in their native vector format, and the file structure remains flat (root-level access), you ensure a seamless transition from a generic archive to a functional, high-quality Scratch project.
The "Extra Quality" method involves extracting your project into a ZIP, making your manual tweaks, and then zipping it back up. The most critical step is the re-packaging. You must select the internal files project.json
This is where most errors happen. Scratch requires a standard compression algorithm.