Zip To Sb3 Apr 2026

I’m unable to generate or provide actual .sb3 (Scratch 3) files, but I can guide you on how to manually — or explain what an .sb3 actually is under the hood. Quick answer: .sb3 is just a renamed .zip Scratch 3 projects ( .sb3 ) are actually ZIP archives containing JSON project data and media assets.

import zipfile import json import os project_data = { "targets": [{ "isStage": True, "name": "Stage", "variables": {}, "lists": {}, "broadcasts": {}, "blocks": {}, "comments": {}, "currentCostume": 0, "costumes": [{ "name": "backdrop1", "dataFormat": "svg", "assetId": "cd21514d0531fdffb22204e0ec5ed84a", "md5ext": "cd21514d0531fdffb22204e0ec5ed84a.svg", "rotationCenterX": 240, "rotationCenterY": 180 }], "sounds": [] }], "monitors": [], "meta": { "semver": "3.0.0", "vm": "0.2.0", "agent": "Python generator" } } 2. Write project.json with open("project.json", "w") as f: json.dump(project_data, f) 3. Zip it with zipfile.ZipFile("output.sb3", "w") as zf: zf.write("project.json") 4. Clean up os.remove("project.json") zip to sb3