If you run into any issues during the conversion, tell me your and whether you are using the online or offline Scratch editor so I can provide targeted troubleshooting steps. Share public link
Note: If you don't see the ".zip" extension, you may need to enable "File name extensions" in your computer's folder options. Load into Scratch : Open the Scratch Online Editor or Scratch Desktop, and go to File > Load from your computer to open your newly created .sb3 file. Converting SB3 to ZIP (Reverse Process)
❌ Zipping the parent folder. This creates a folder inside the SB3, which Scratch cannot read. Scratch expects project.json at the root of the archive. convert zip to sb3
Because SB3 files are ZIP archives internally, —you simply change the file extension or repackage the contents. If you have a folder or a ZIP that contains the correct internal structure (a project.json file and asset folders), you can turn it into a working SB3 file in seconds.
✅ Correct: The ZIP’s root contains project.json , not a subfolder. If you run into any issues during the
: The brain of the project. This text file contains all the code, blocks, variables, and structural data for your sprites.
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 SB3 to ZIP (Reverse Process) ❌ Zipping
Open the folder containing your Scratch project assets. You should see a file named project.json alongside various asset files (like asset IDs with .svg or .wav extensions).
If your ZIP file already contains the correct Scratch file structure (a project.json file and asset files like .svg or .wav at the root), you can simply rename the extension. your .zip file in your computer's file explorer. Right-click the file and select Rename . Change the extension from .zip to .sb3 . Confirm the change when the warning dialog appears.
How to Convert ZIP to SB3: A Complete Step-by-Step Guide Scratch is one of the most popular platforms for learning programming, allowing users to create interactive stories, games, and animations. When you download a project from Scratch to your computer, it saves as an .sb3 file. However, many users discover that an .sb3 file is actually just a compressed archive in disguise.