beam

.beam — Erlang Bytecode

Erlang Ecosystem · 1998

Developer
Erlang Ecosystem
Category
Programming
MIME Type
application/x-erlang-bytecode
First Released
1998
Open Format
Yes
File Signature
Not a distinct, easily identifiable magic byte sequence for the .beam format itself; it's recognized by the BEAM VM's loader.
At a Glance
.beam
Erlang Bytecode

A compiled Erlang program module containing bytecode executable by the Erlang Virtual Machine.

Reviewed on August 2, 2026
Compression
Binary
Transparency
No
Editability
Low
Best for
Erlang execution

Key Features

  • Contains compiled Erlang bytecode for efficient execution.
  • Enables cross-platform compatibility via the BEAM virtual machine.
  • Optimized for high concurrency and fault tolerance.
  • Integral part of Erlang application deployment and distribution.

Best For

  • Deploying Erlang/Elixir applications.
  • Ensuring efficient execution of Erlang code.
  • Building highly available systems.
  • Distributing software components within the Erlang ecosystem.

Less Ideal For

  • Storing human-readable source code.
  • Directly editing or modifying program logic.
  • Sharing code with non-Erlang environments without a VM.
  • Use as a general-purpose data storage format.

Common Use Cases

  • Distributing Erlang applications and libraries.
  • Running compiled Erlang code on servers.
  • Deploying microservices built with Erlang/Elixir.
  • Creating fault-tolerant backend systems.

How to Open It

  1. The Erlang runtime environment (including the BEAM VM) is required to execute .beam files.
  2. You typically don't 'open' a .beam file directly but rather load it into an Erlang shell or application.
  3. Use the `code:load_file/1` function in the Erlang shell to load a module from a .beam file.
  4. Install Erlang or Elixir, and your development environment will handle .beam files during compilation and execution.

What is a .beam file?

A .beam file is a compiled module produced by the Erlang programming language compiler. It contains low-level bytecode instructions that can be executed by the Erlang Virtual Machine (BEAM). These files are the standard way to distribute Erlang applications and libraries. They are optimized for concurrency, fault tolerance, and distribution, making them suitable for building robust and scalable systems. While not human-readable directly, they are the essential component for running Erlang programs.

Programs That Open .beam Files

PlatformProgram
WindowsErlang/OTPFreeOfficial
ElixirFreeOfficial
macOSErlang/OTP (via Homebrew)FreeOfficial
Elixir (via Homebrew)FreeOfficial
LinuxErlang/OTPFreeOfficial
ElixirFreeOfficial

Common Problems with .beam Files

⚠️ Cannot execute .beam file without the Erlang runtime.
Ensure Erlang/OTP is installed and properly configured on your system. Use the Erlang shell to load modules.
⚠️ Difficulty understanding the file's content directly.
.beam files are compiled bytecode and are not meant for direct human reading. Refer to the original .erl or .ex source files for logic.

Frequently Asked Questions

What is the BEAM virtual machine?▼

The BEAM VM is the runtime environment for Erlang and Elixir, executing .beam bytecode and managing processes, concurrency, and fault tolerance.

Can I edit a .beam file?▼

Direct editing of .beam files is not practical as they are compiled bytecode. You should edit the original source files (.erl or .ex) and recompile them.

How are .beam files related to .erl files?▼

.beam files are the compiled output of .erl (Erlang) or .ex (Elixir) source files. The Erlang compiler generates .beam files from source code.

Technical Details

.beam files are binary files containing abstract machine code optimized for the BEAM virtual machine. They are generated from Erlang source code (.erl) and include functions, exports, and other metadata. The BEAM VM interprets this bytecode, enabling cross-platform execution without recompilation.

Did You Know?

The BEAM VM is named after Joe Armstrong's hobby of building model aeroplanes, with 'BEAM' potentially referencing an aircraft.
.beam files are designed to be highly efficient for the specific task of running concurrent, fault-tolerant Erlang applications.

Security Information

.beam files are compiled code and should be treated with the same caution as any executable binary. Only run .beam files from trusted sources to avoid potential security risks.