Convert | Zip To Sb3

The native file format for Scratch 3.0 projects. It contains a project.json file (which holds all the code blocks and logic), along with .svg , .png , and .wav files representing the project's sprites, backdrops, and audio assets.

Once the conversion is complete, verify that the file functions properly within the Scratch environment: Go to the official ⁠Scratch MIT Editor . Click on in the top menu bar. Select Load from your computer .

Converting a file back into an SB3 file is a common task for Scratch developers who want to manually edit project code or assets . Since an .sb3 file is essentially a renamed ZIP archive containing a project.json file and various media assets, the "conversion" is primarily about proper re-packaging. Method 1: Manual Renaming (Fastest)

Select (Windows) or Compress [X] Items (macOS). Rename that newly created archive to end in .sb3 . Troubleshooting Common Load Errors convert zip to sb3

: Select all the contents inside the folder (not the folder itself). Compress files :

: If a warning appears about changing file extensions, click Understanding the SB3 File Structure file is highly organized. When you rename it to and open it, you will typically find: project.json

The file extension is the standard format for Scratch 3.0 projects. Structurally, an .sb3 file is actually a renamed ZIP archive containing the project’s assets (images and sounds) and a project.json file that defines the code. The native file format for Scratch 3

If you edited any images or audio files while they were unzipped, ensure they maintain their exact original filenames (e.g., 83a15b...svg ) and are not corrupted.

Before jumping into the conversion process, it helps to understand what these file types actually are.

If you change the file extension of any .sb3 file to .zip and extract it, you will find the following core components: Click on in the top menu bar

Hover over and select Compressed (zipped) folder . (On Windows 11, you can simply click Compress to ZIP file from the context menu).

Right-click the highlighted files, hover over Send to , and select Compressed (zipped) folder . Alternatively, right-click and use a tool like 7-Zip or WinRAR to create a standard ZIP archive.

Windows will show a warning: "If you change a file name extension, the file might become unusable." Click to confirm. Method 2: macOS (No Software Required)