For more advanced modifications or better performance with large files, you can load your .sb3 into TurboWarp, which offers more features than the standard Scratch editor.
Always prefer SVGs over PNGs for "extra quality." They scale infinitely without pixelation.
Follow this high-fidelity pipeline. You will need either (Windows), Keka (Mac), or Terminal (Linux/Mac).
Ensure your assets and project.json are at the absolute root of the ZIP file. If they are hidden inside a sub-folder inside the ZIP, Scratch will throw a "Loading project failed" error. zip to sb3 extra quality
The project.json file is the brain of your Scratch project. It contains all the data about sprites, scripts, variables, and more.
: Do not rename the assets manually unless you also update their corresponding entries in the project.json 2. Create the ZIP Archive : Select only the files your project folder (the JSON and media files). Do
Standard automated online converters often re-compress images and audio to reduce file size. This compression introduces artifacts, blurs vector lines, and degrades sound quality. For more advanced modifications or better performance with
A tool designed to pack Scratch projects, handling asset hashing and JSON creation.
If you edited the text inside project.json , ensure you saved the file with UTF-8 encoding. Other encodings will cause the Scratch parser to crash.
What (if any) does Scratch display when you try to load the file? You will need either (Windows), Keka (Mac), or
Unoptimized code or inefficient asset loading. Why "Extra Quality" Matters
(exported from a tool, downloaded, or compressed manually)?
A text file containing the code, variables, blocks, and structural data of your Scratch project.
If you are looking for "extra quality" in terms of performance (e.g., higher framerates or specialized features), consider using a or Compiler instead of a simple manual conversion.