Select inside the folder (Ctrl+A on Windows, Cmd+A on Mac). Do not select the parent folder itself. Right-click on the highlighted files. Compress the files:
This is a foolproof method that lets you inspect a project's contents. It's also great if you want to edit the raw JSON of a project. convert zip to sb3 updated
If you want to troubleshoot a specific project that will not load, tell me or what error message Scratch shows , and I can help you fix the file structure. Share public link Select inside the folder (Ctrl+A on Windows, Cmd+A on Mac)
Do you have the file ready, or are you trying to convert a specific type of file (like an old .sb2 or .sprite3 ) into a ZIP first? Compress the files: This is a foolproof method
: Sometimes the easiest workaround is uploading your assets directly. If you have the loose assets, you can create a blank project on the Scratch website, click File > Load from your computer , and select your compressed archive. The editor is highly forgiving with standard ZIP files that hold proper project.json structures.
: Go to the Scratch Editor , click File > Load from your computer , and select your new .sb3 file. 2. Modern Conversion Tools (Updated 2026)