Before learning how to convert files, it's crucial to understand the relationship between the two formats.

Select Compress to ZIP file (or Send to > Compressed (zipped) folder ). Mac: Select Compress X Items . A new .zip file will appear.

Select your project assets, right-click, and choose Compress . Rename: Click on the file name of the Archive.zip . Change Extension: Change the suffix from .zip to .sb3 .

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A collection of .svg , .png , .wav , or .mp3 files. These represent the costumes, backdrops, and sounds used in the project, named using cryptographic hashes (MD5 checksums).

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Several JavaScript libraries provide programmatic manipulation of Scratch project files: