To help me provide more specific troubleshooting, let me know:
Safety Note: Only upload files to websites you trust. If your Scratch project contains personal images or private information, Method 1 or Method 3 is highly recommended to protect your privacy. Method 3: Compressing Loose Assets via Archive Software
Right-click (or Control-click) the file and choose . Expand the Name & Extension section. Delete zip and type sb3 in its place. convert zip to sb3
Use unzip -l file.zip to list contents. If project.json is present at top level, renaming is safe.
Highlight and select inside this directory. Right-click the highlighted items: To help me provide more specific troubleshooting, let
Delete .zip from the end of the filename and replace it with .sb3 (e.g., my_project.sb3 ).
What are you currently using (Windows, Mac, Chromebook)? Where did you originally get the ZIP file from? Expand the Name & Extension section
MIT developed the .sb3 format as a renamed .zip archive. The Scratch editor packages the JSON code and assets, compresses them using standard ZIP algorithms, and applies the .sb3 extension so the Scratch ecosystem recognizes it. Method 1: The Manual Renaming Method (Fastest)