YSP File
What are YSP files and how to open them
Are you having problems opening a YSP file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your YSP files.
What is a YSP file?
A .YSP file is a BYOB Sprite file.
The BYOB Sprite format with extension .YSP is a graphics‐based file used by BYOB (Build Your Own Blocks), a visual, drag‐and‐drop programming environment descended from Scratch. BYOB sprites are characters or game objects in a project - they carry 2-D images (called costumes), variables, scripts, animation and behaviour settings that allow them to appear and act in the project. A .YSP file is produced when you export or save a sprite so that it can be reused, shared, or imported into other BYOB projects.
The only program known to create and read .YSP files is BYOB (now also known under the name Snap!), across Windows, MacOS, and Linux platforms. When you export a sprite from within BYOB using its sprite menu or right-clicking on a sprite, it writes the image data and associated sprite attributes (such as name, position, direction, costume number, and variables unique to that sprite) into a .YSP file. That file can later be imported back into a BYOB or Snap! project.
Internally .YSP files are binary files beginning with a header signature "4F626A530153746368010000" (ASCII "ObjS.Stch…"), and they contain labelled strings such as "NORMAL", "BLOCK", "STAGE", "BYOB", and ".YSP" embedded in their data. These help identify the file format for importing and verifying sprites.
How to open YSP files
We have identified one YSP opener that is compatible with this specific type of YSP file.
Programs that open BYOB Sprite files
 | BYOB | Verified |
Last updated: August 14, 2026
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