How to Convert ZIP to SB3: A Complete Step-by-Step Guide If you are working with Scratch 3.0, you might occasionally find yourself with a .zip file that you need to open as a Scratch project. Conversely, you might have a .sb3 file that accidentally changed its extension to .zip .
: If your project loads but has white squares or no sound, ensure all MD5-named files from the original ZIP were included in your new SB3 compression.
There are several scenarios where you might find yourself needing to turn a ZIP archive back into a functional Scratch project:
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. convert zip to sb3
: A text-based file containing the instructions and scripts.
Open File Explorer. Click on the View tab at the top menu and check the box next to File name extensions . (On Windows 11, click View > Show > File name extensions ). Locate Your File: Find the .zip file you want to convert.
Converting a ZIP archive into an SB3 (Scratch 3 project) is commonly needed when project files were exported or shared as a zipped folder (containing JSON, assets, and extension folders) instead of the single .sb3 package Scratch expects. Below is a concise, practical guide to achieve this safely and reliably, plus when and why you’d do it. How to Convert ZIP to SB3: A Complete
If you manually zipped components together, make sure the project.json file is present in the root directory of the archive. Scratch cannot read the project without this file.
Now you have the knowledge to turn any valid ZIP into a fully functional Scratch 3.0 project. Whether you’re a teacher collecting student work, a developer modding projects, or a hobbyist recovering old files, mastering this simple technique will save you time and frustration.
: To go the other direction (from SB3 to a ZIP containing an executable), use the TurboWarp Packager . Troubleshooting Common Errors There are several scenarios where you might find
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Open the Scratch Online Editor , go to , and select your new file. Method 2: Re-Zipping Extracted Files
Get-ChildItem -Filter *.zip | Rename-Item -NewName $_.Name -replace '\.zip$','.sb3'