If you have a collection of Scratch assets (like sprites, sounds, and a project.json file) inside a ZIP folder and want to turn it back into a playable Scratch project, follow these steps:
: A text file containing all the code, variable definitions, block placements, and metadata for the project. convert zip to sb3 updated
To use these tools, simply upload your ZIP file, select the output format as SB3, and click "Convert". If you have a collection of Scratch assets
Alternative: Converting Older Formats (.sb and .sb2) to .sb3 You can also use Scratch itself to convert
are fundamentally ZIP archives that contain a project.json file along with various assets (sounds and costumes), a feature for "converting ZIP to SB3" can go beyond a simple file extension rename.
You can also use Scratch itself to convert a ZIP file to SB3:
In this updated 2026 guide, we will walk through everything you need to know. We will explain why the .sb3 format changed, why ZIP files appear, and provide step-by-step methods to safely convert your ZIP archives back into working Scratch projects.