.SB3 File Extension

Scratch 3.0 Project

Developer MIT
4.3  |  1770 Votes

What is an SB3 file?

An SB3 file is a project created with Scratch 3.0, a program development platform created at the Massachusetts Institute of Technology (MIT). It contains a program written in the Scratch programming language, which is used for creating stories, small games, and animations. SB3 files replaced Scratch .SB2 files.

More Information

Screenshot of a .sb3 file in MIT Scratch 3.0
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 sprites, scripts, costumes, and sound 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:

  1. Open your project in the Scratch Editor.
  2. Select File → Save to your computer.
  3. 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.

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:

  1. Open the Scratch Editor in your web browser.
  2. Select File → Load from your computer.
  3. Navigate to and open your SB3 file.

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:

  • .EXE - Windows Application
  • .APP - macOS Application Bundle
  • .HTML - Hypertext Markup Language File
  • .ELF - Executable and Linkable Format File
  • .ZIP - Zipped File
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Programs that open SB3 files

Chrome OS

Verified by FileInfo.com

The FileInfo.com team has independently researched the Scratch 3.0 Project file format and Mac, Windows, Linux, and Android apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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