If you have unzipped an .sb3 file to edit its contents and need to turn it back into a functional Scratch project, follow these steps to avoid common corruption errors:
file to be at the absolute root of the archive. If it is nested inside another folder within the zip, the Scratch editor will fail to recognize it as a valid project. 3. The Technical Fix (Step-by-Step) To successfully revert a to a functional , follow these standard Windows/macOS procedures Extract the Files : Fully unzip the corrupted archive into a new folder. Verify Root Contents : Ensure that project.json and folders like (if any) are visible immediately upon opening the folder. Select Internal Files right-click the folder itself. Open the folder, select all individual files and folders inside (Ctrl+A or Cmd+A). Compress the Selection : Right-click the highlighted files > Compressed (zipped) folder : Right-click the highlighted files > Compress X Items Rename the Extension : Rename the resulting Archive.zip ProjectName.sb3 . Confirm the change when prompted by the operating system. 4. Addressing Corrupted Archives convert zip to sb3 fix
: Ensure the project.json file and all asset folders (costumes, sounds) are at the root level of this folder. If you have unzipped an
Would you like a short UI mockup or CLI command examples next? The Technical Fix (Step-by-Step) To successfully revert a
In this guide, we will explain ZIP files masquerade as SB3 files, the exact steps to convert them correctly, and most importantly—the fixes for when the simple conversion goes wrong.