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LLSP SB3
File conversion

Convert LLSP to SB3

Verified by Adam B.· reviewed by FE Editorial ·updated Sep 10, 2026
QUICK ANSWER
Is it possible to convert LLSP to SB3?
Yes - LLSP converts to SB3.

SPIKE word-block projects are built on Scratch 3, and the .sb3 is packed inside the .llsp archive. Open the .llsp with 7-Zip (renaming to .zip helps) and extract the inner .sb3. It will open in Scratch, but most SPIKE blocks are custom extension blocks that plain Scratch cannot execute.

Also to SB3: SB

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert LLSP to SB3?

.llsp is a zip wrapper around a standard Scratch 3 project, and .sb3 is that native Scratch format. Extracting the .sb3 lets you inspect the block structure, reuse project.json, or open the file in the Scratch editor.

How to convert LLSP to SB3

7-Zip

Right-click the .llsp (or copy it and rename to .zip), open with 7-Zip, and extract the inner .sb3 file from the archive.

unzip (macOS/Linux)

Run unzip yourproject.llsp in a terminal to unpack the bundle, then take the .sb3 from the extracted contents.

About these formats

.LLSP LEGO Education SPIKE Project

An .llsp file is a project saved by the LEGO Education SPIKE App version 2, holding the block-based or Python program a student built for a SPIKE Prime or SPIKE Essential robot. It is a ZIP…

Open .LLSP details →
.SB3 Scratch 3.0 Project File

An SB3 file is a Scratch 3.0 project - a visual programming project made with MIT's Scratch. Open it at scratch.mit.edu (File → Load from your computer) or in the free Scratch Desktop app.…

Open .SB3 details →

Quality & what to watch

  • The .sb3 uses SPIKE-specific extension blocks, so standard Scratch shows them but cannot run the robot code.
  • You are extracting, not converting - the .sb3 is exactly the file SPIKE stored inside the project.
  • The inner project.json is best read through a JSON beautifier if you only need to copy logic between programs.

Frequently asked questions

Will the .sb3 run in normal Scratch?
Only partially. General blocks work, but the SPIKE hardware blocks are custom extensions that Scratch cannot execute.
Do I have to rename the file first?
Not always, but changing .llsp to .zip makes Windows and 7-Zip recognize it as an archive more reliably.
Why is it 'double-zipped'?
The .llsp zip contains an .sb3, which is itself a zip holding project.json and media files.
Can I edit and put it back?
Yes - edit the inner files, re-zip to .sb3, then re-zip into the .llsp if you need it back in SPIKE.