Remember the golden rules:
The Scratch community is pushing for a formal . Proposed features include: zip to sb3 extra quality
This means converting a generic ZIP to SB3 isn’t about transcoding—it’s about . Remember the golden rules: The Scratch community is
. If you don't see the extension, ensure "File name extensions" is enabled in your folder settings. Open in Scratch : You can now load this file directly into the Scratch Editor File > Load from your computer If you don't see the extension, ensure "File
No actual compression or decompression is needed – the internal structure remains identical.
| Mistake | Quality Impact | Fix | |---------|----------------|-----| | Using built-in macOS “Compress” function | Adds __MACOSX and .DS_Store files → project fails to load | Use Keka or Terminal zip -X | | Renaming .rar or .7z to .zip | Corrupts entire structure | Convert only real ZIP files, not other archives | | Keeping backup files inside (e.g., script.js~ ) | Causes JSON parsing errors | Delete all hidden files before zipping | | Zipping the parent folder | Creates ProjectFolder/project.json → Scratch sees no root JSON | cd into the folder, then zip contents | | Using online converters | Uploads your assets to unknown servers + often re-samples images to 72dpi | Use offline tools only |
Use 44.1kHz WAV files. Scratch will compress them, but starting with high-quality source files prevents "generational loss."
