If you're already using Scratch, you can convert a ZIP file to SB3 directly within the platform:
: Scratch names these assets based on their MD5 hash to ensure uniqueness within the project. 2. Why the Conversion is Necessary
: If you need to optimize 50 audio tracks or upscale 30 costumes, doing it inside the Scratch editor is tedious. Extracting the project to a ZIP allows you to batch-process assets using professional external tools like Photoshop or Audacity. convert zip to sb3
When the Scratch engine opens an .sb3 file, it expects to find project.json sitting directly at the root level, not buried inside a subfolder. How to compress correctly: Open the folder containing your modified assets.
For a fast, direct, and private conversion, using a browser-based tool like is the best approach. It operates entirely within your browser, ensuring your file data never leaves your device and is not uploaded to any external server. If you're already using Scratch, you can convert
If you prefer a more manual approach:
For the renamed .sb3 file to work in the Scratch Editor , the internal ZIP structure must include: Extracting the project to a ZIP allows you
Scratch 3.0 (SB3) is a popular programming language used for creating interactive stories, games, and animations. However, sometimes you may need to convert a ZIP file to SB3 format, perhaps to import a project into Scratch or to modify a zipped project file. In this guide, we'll walk you through the process of converting a ZIP file to SB3.
Double-click the newly renamed .sb3 file, or open it from within the Scratch editor (File > Load from your computer). If your ZIP file's internal structure matches what Scratch expects, the project will load successfully.
file is essentially a renamed archive containing a project's JSON code, images, and sounds. Converting a ZIP back to an SB3 is a manual process that involves ensuring the internal file structure is correct and then changing the file extension. How to Convert ZIP to SB3 Prepare your files : Ensure the root of your ZIP folder contains the project.json file and all necessary asset files (like ). Do not put them inside a sub-folder within the ZIP. Compress the files