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LOBSTER LPAK
File conversion

Convert LOBSTER to LPAK

Verified by Adam B.· reviewed by FE Editorial ·updated Jul 13, 2026
QUICK ANSWER
Is it possible to convert LOBSTER to LPAK?
Yes - LOBSTER converts to LPAK.

Run the Lobster compiler with --pak (or --rpak) on your .lobster file to produce a default.lpak pakfile beside it, holding your code and data files for easy distribution. Use --rpak if you want runnable code included for JIT runs, or --pak alongside a --cpp executable.

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert LOBSTER to LPAK?

An .lpak (Lobster Program Archive) lets you ship a Lobster program as just the executable plus one pak file, with all assets packed together. It keeps distribution simple by collapsing every data file you flagged into a single archive.

How to convert LOBSTER to LPAK

Lobster (--pak) OPEN-SOURCE

Run lobster --pak mygame.lobster to generate default.lpak in the same folder. This version omits runnable code and pairs with an executable built via --cpp.

Lobster (--rpak) OPEN-SOURCE

Run lobster --rpak mygame.lobster to build default.lpak that also includes runnable code, which is what you want when running in JIT mode.

About these formats

.LOBSTER Lobster Source Code File

A .lobster file holds source code written in the Lobster programming language, a statically typed language with Python-like indentation created by Wouter van Oortmerssen and aimed mainly at…

Open .LOBSTER details →
.LPAK LPAK File

A .LPAK file is a data file used by specific software.

Open .LPAK details →

Quality & what to watch

  • The output is always named default.lpak and lands next to the source file, so rename it yourself if you need a different name.
  • Only files you marked with the pakfile keyword (plus code) are included - arbitrary assets aren't packed automatically.
  • --pak and --rpak don't run the program; they only produce the pak, so pick --rpak if the pak itself must be runnable.

Frequently asked questions

What is the difference between --pak and --rpak?
--rpak includes runnable code in the pak (for JIT runs), while --pak leaves it out for use with a --cpp-built executable.
Can I choose the output file name?
Not directly. Lobster always writes default.lpak beside the .lobster file, so rename it afterward if needed.
What goes inside the .lpak?
Your program's code (with --rpak) and any data files you specified with the pakfile keyword, bundled into one archive.
Does building a pak also run my program?
No. Both --pak and --rpak generate the pakfile and stop without executing the program.