Zip To Sb3 Converter (2027)

While this works, it is prone to human error. Forgetting to use “Store” compression (no compression) or accidentally nesting folders breaks the Scratch interpreter. This is why automated exist.

Click the "Convert to SB3" button. The tool will restructure the archive, remove unnecessary metadata, and package it specifically for the Scratch Virtual Machine. Zip To Sb3 Converter

Advanced modders often prefer to work with assets in bulk. Instead of importing 50 images one by one in the Scratch editor, they unzip the SB3, replace the image files in the resources folder, edit the project.json to point to the new names, and then re-zip everything. A converter automates this final re-packaging step. While this works, it is prone to human error

To convert a ZIP to an SB3, the converter must ensure the internal structure is correct so Scratch can read it: Click the "Convert to SB3" button

An .sb3 file is actually a standard containing:

You can now double-click the file, and it will open in the Scratch Offline Editor (or you can upload it to the Scratch website).