Navigate to a trusted cloud conversion website (such as CloudConvert or Zamzar). Upload your .zip file from your local storage.
If you extracted the contents of your ZIP file into a standard folder, edited the code or images, and now want to turn it back into an SB3 project, changing the folder extension will not work. You must compress the internal files directly.
Before converting the ZIP file directly, it's worth checking if you can import it into Scratch as is. convert zip to sb3
: If you need to optimize 50 audio tracks or upscale 30 costumes, doing it inside the Scratch editor is tedious. Extracting the project to a ZIP allows you to batch-process assets using professional external tools like Photoshop or Audacity.
A warning will pop up saying, "If you change a file name extension, the file might become unusable." Click or Use .sb3 . Navigate to a trusted cloud conversion website (such
After converting:
Highlight the items inside the folder (Ctrl+A or Cmd+A). You must compress the internal files directly
An .sb3 file is the native file format used by Scratch 3.0. It contains all the instructions, code, images, and sounds required to run your Scratch project.
Converting ZIP to SB3 is a valuable skill for any Scratch user, whether you're a beginner trying to open a friend's project or an advanced developer automating asset extraction. Remember these key takeaways:
Even after converting, Scratch might refuse to load your file. Here’s why: