Ensure all your project assets and the project.json file are at the root of the ZIP folder. If they are buried inside another folder within the ZIP, Scratch won't recognize them.
: It scans for corrupted files or unsupported formats within the ZIP archive that might cause the Scratch editor to crash. Zip To Sb3 Converter
A is a utility designed to package the assets of a Scratch project (images, sounds, and code) back into a single .sb3 file format. Since .sb3 files are actually renamed ZIP archives, these converters often focus on ensuring the internal structure is correct so Scratch can read it. The Digital Alchemist: Unpacking the ZIP to SB3
: If your assets are in a folder, extract them first. The Drag-and-Drop Integrity Checks : It scans for
If your zip file is actually an old Scratch 2.0 project (contains a project.json but the internal structure looks different, or the file extension was .sb2 originally), simply renaming it to .sb3 .
: When converting from a ZIP to SB3, the tool must verify that all costumes (images) and sounds are correctly referenced. In an