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SB3 File - What is an .sb3 file and how do I open it?

Learn about .SB3 files and view a list of programs that open them.

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Overview

What is an SB3 file? An SB3 file is a project created by Scratch 3.0, a visual programming platform developed at the Massachusetts Institute of Technology (MIT) for creating stories, small games, and animations. It contains a Scratch program made from code blocks, along with assets such as sprites , sounds, and project metadata . SB3 files replaced Scratch .SB2 files, and are saved in a Zip-based format that stores project data in JSON .

More Information SB3 file open in MIT Scratch 3.0 SB3 files are saved in the Scratch 3.0 file format, SB2 files are saved in the Scratch 2.0 file format, and .SB files are saved in the original Scratch file format. Each SB3 file is a .ZIP archive that stores a development project's contents, including a .JSON file (likely named project.json ), sprites, scripts, costumes, and audio files. How to create an SB3 file Typically, developers create SB3 files by saving projects to their computer from MIT's online Scratch Editor, which can be accessed from https://scratch.mit.edu/ . To save a Scratch Editor project as an SB3 file: Open your project in the Scratch Editor. Select File → Save to your computer . Name your file, select a save location, and click Save . Developers can also create SB3 files in MIT's offline Scratch editors, which are available for Windows, macOS, Android, and ChromeOS devices. NOTE: In SB3 , the S stands for "Scratch," the B for "Binary," and the 3 for the version of Scratch (3.0).

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What is an SB3 file?

An SB3 file is a project created by Scratch 3.0, a visual programming platform developed at the Massachusetts Institute of Technology (MIT) for creating stories, small games, and animations. It contains a Scratch program made from code blocks, along with assets such as sprites , sounds, and project metadata . SB3 files replaced Scratch .SB2 files, and are saved in a Zip-based format that stores project data in JSON .

More Information

SB3 file open in MIT Scratch 3.0

SB3 files are saved in the Scratch 3.0 file format, SB2 files are saved in the Scratch 2.0 file format, and .SB files are saved in the original Scratch file format. Each SB3 file is a .ZIP archive that stores a development project's contents, including a .JSON file (likely named project.json ), sprites, scripts, costumes, and audio files.

How to create an SB3 file

Typically, developers create SB3 files by saving projects to their computer from MIT's online Scratch Editor, which can be accessed from https://scratch.mit.edu/ . To save a Scratch Editor project as an SB3 file:

Developers can also create SB3 files in MIT's offline Scratch editors, which are available for Windows, macOS, Android, and ChromeOS devices.

NOTE: In SB3 , the S stands for "Scratch," the B for "Binary," and the 3 for the version of Scratch (3.0).

How to open an SB3 file

You can open an SB3 file with Scratch Desktop (Windows, Mac), Scratch for Android and ChromeOS, or MIT's online Scratch Editor (Web). To open an SB3 file in the online Scratch Editor:

You can also extract an SB3 file's contents with any Zip-decompression utility (such as 7-Zip or Apple Archive Utility ), after renaming the file to use the .zip extension.

How to convert an SB3 file

You can use TurboWarp Packager to convert an SB3 file to an executable format, so you can run the program it contains on a PC or in a web browser. TurboWarp Packager can export SB3 files in the following formats:

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Programs that open SB3 files

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Windows

Scratch Desktop

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Scratch Desktop

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Turbowarp

Free

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Scratux

Free

Turbowarp

Free

Web

MIT Scratch

Free

Turbowarp

Free

Android

Scratch

Free

Chrome OS

Scratch

Free

Category: Developer Files

Updated: December 8, 2025

FAQ

What is an SB3 file?↓
An SB3 file is a project created by Scratch 3.0, a visual programming platform developed at the Massachusetts Institute of Technology (MIT) for creating stories, small games, and animations. It contains a Scratch program made from code blocks, along with assets such as sprites, sounds, and project metadata. SB3 files replaced Scratch .SB2 files, and are saved in a Zip-based format that stores project data in JSON.
How do I open an .sb3 file?↓
You can open an SB3 file with Scratch Desktop (Windows, Mac), Scratch for Android and ChromeOS, or MIT's online Scratch Editor (Web). To open an SB3 file in the online Scratch Editor:
How do I convert an .sb3 file?↓
You can use TurboWarp Packager to convert an SB3 file to an executable format, so you can run the program it contains on a PC or in a web browser. TurboWarp Packager can export SB3 files in the following formats:

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