. 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
Scratch converts these internally, but manual injection into the ZIP allows you to replace compressed sounds with higher-quality versions before the file is finalized. 3. TurboWarp for High Resolution If "extra quality" refers to performance or display resolution TurboWarp Packager It allows for High Quality Pen Interpolation (for smoother 60 FPS motion), and Custom Stage Sizes (e.g., 1080p instead of the standard 480x360). TurboWarp Packager 🛠️ Manual Conversion Guide (Step-by-Step) Right-click your and change extension to . Extract all files. Add your high-quality assets. Ensure project.json is correctly mapped. Select All Select the individual files the folder (not the folder itself). Right-click > Send to > Compressed (zipped) folder. Change the new file from Archive.zip MyProject.sb3 ⚠️ Common Pitfalls Extension Hiding:
Extract your ZIP file into a temporary workspace. Ensure that the project.json file sits at the absolute root of the folder. There should be no nested subdirectories. Every costume and sound file must live in this same root folder alongside the JSON file. 2. Verify Asset Naming Conventions zip to sb3 extra quality
Scratch compresses audio upon import. To preserve "extra quality," pre-render your audio files at a sample rate of 44.1 kHz. Step 3: Repackage the Archive
Scratch references assets via unique MD5 hashes. Ensure your images and audio files are named exactly as they are written inside the project.json file. Do not use descriptive names like cat_walk.png ; keep the original cryptographic names (e.g., 83a82df7f35f7924d24b21331320364f.png ). 3. Execute Premium Deflate Compression Extract all files
An .sb3 file is a compressed archive containing a project.json file (which holds the code and layout data) along with various .svg , .png , .wav , and .mp3 files representing costumes and sounds.
if == " main ": # Convert from a .zip file zip_to_sb3_extra_quality("my_project.zip", "output_quality.sb3") keep the original cryptographic names (e.g.
Because an .sb3 file is structurally a ZIP file, converting from a ZIP back to an .sb3 is technically a repackaging process rather than a destructive file translation. Step-by-Step Manual Conversion Method
To compile the folder back into a highly stable archive, use a robust archiving utility like 7-Zip (Windows) or Keka (macOS) rather than native OS compression, which can sometimes inject hidden system files (like .DS_Store or Thumbs.db ).