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You will get a new file named Archive.zip or named after one of your assets. Rename this file to your project name and change the extension from .zip to .sb3 using the steps outlined in Method 1. How to Open Your Converted SB3 File in Scratch
Converting a ZIP to SB3 isn't just a file conversion—it's an act of transparency. It reveals that Scratch is built on open web standards: JSON for logic and standard image/audio formats for media.
: Change the filename from Archive.zip to ProjectName.sb3 .
Ensure file extensions are visible. Click the tab at the top, then check the box next to File name extensions . Right-click your file and select Rename (or press F2 ). Change the .zip text at the end of the file name to .sb3 . convert zip to sb3
If file extensions are hidden on your computer, you might have accidentally renamed your file to project.sb3.zip instead of project.sb3 . Double-check your system settings to ensure extensions are truly visible.
src = Path("scratch_project") # folder containing project.json at root out = Path("project.sb3")
The good news is that an .sb3 file is actually just a renamed ZIP archive. This comprehensive guide will explain the relationship between these two formats and show you exactly how to convert a ZIP file back into a functional Scratch 3.0 project. Understanding ZIP and SB3 Files You will get a new file named Archive
Why? Because an SB3 file can contain JavaScript inside project.json (via "extension" blocks). A malicious actor could theoretically embed harmful code that exploits an old version of the Scratch app. Always scan ZIP files with an antivirus before renaming them to SB3.
Open the folder where your project files ( project.json , costume images, sounds) are located.
Replace .zip at the end of the file name with .sb3 . It reveals that Scratch is built on open
If your ZIP file is already a valid Scratch project structure:
This is a universal compression format used to bundle multiple files together.
| Current Format | Action | |----------------|--------| | Valid SB3 renamed to .ZIP | Rename back to .sb3 | | Folder with project.json | ZIP contents → rename to .sb3 | | SB2 or older ZIP | Use Scratch’s menu |
Method 2: Recompressing Extracted Files (For Edited Projects)
So, why would you want to convert a ZIP file to SB3? Here are a few reasons:
You will get a new file named Archive.zip or named after one of your assets. Rename this file to your project name and change the extension from .zip to .sb3 using the steps outlined in Method 1. How to Open Your Converted SB3 File in Scratch
Converting a ZIP to SB3 isn't just a file conversion—it's an act of transparency. It reveals that Scratch is built on open web standards: JSON for logic and standard image/audio formats for media.
: Change the filename from Archive.zip to ProjectName.sb3 .
Ensure file extensions are visible. Click the tab at the top, then check the box next to File name extensions . Right-click your file and select Rename (or press F2 ). Change the .zip text at the end of the file name to .sb3 .
If file extensions are hidden on your computer, you might have accidentally renamed your file to project.sb3.zip instead of project.sb3 . Double-check your system settings to ensure extensions are truly visible.
src = Path("scratch_project") # folder containing project.json at root out = Path("project.sb3")
The good news is that an .sb3 file is actually just a renamed ZIP archive. This comprehensive guide will explain the relationship between these two formats and show you exactly how to convert a ZIP file back into a functional Scratch 3.0 project. Understanding ZIP and SB3 Files
Why? Because an SB3 file can contain JavaScript inside project.json (via "extension" blocks). A malicious actor could theoretically embed harmful code that exploits an old version of the Scratch app. Always scan ZIP files with an antivirus before renaming them to SB3.
Open the folder where your project files ( project.json , costume images, sounds) are located.
Replace .zip at the end of the file name with .sb3 .
If your ZIP file is already a valid Scratch project structure:
This is a universal compression format used to bundle multiple files together.
| Current Format | Action | |----------------|--------| | Valid SB3 renamed to .ZIP | Rename back to .sb3 | | Folder with project.json | ZIP contents → rename to .sb3 | | SB2 or older ZIP | Use Scratch’s menu |
Method 2: Recompressing Extracted Files (For Edited Projects)
So, why would you want to convert a ZIP file to SB3? Here are a few reasons: