FA

FASM

FASM (flat assembler) is a fast, open-source assembler for x86 and x86-64 processors supporting Intel-style assembly language, capable of producing multiple output formats including binary, MZ, PE, COFF, and ELF. It is self-hosting and highly portable across operating systems.
Latest: 1.73.32
Last checked: Feb 21, 2026 10:45am
Rank: 4497/15140
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Overview

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License: Open sourceWinget: Available

Version & Lifecycle

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Current: 1.73.32 Oldest supported: 0.90 Avg cadence: Every 1203 days

Top Contributors

Top sitewide contributors:

  1. Anbarasan
  2. nico_k
  3. Bob
  4. Vigneshwaran

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Also known as

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fasm

Packaging Notes

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Single executable packages for Linux, Windows, and MacOS; produces identical output across OSes

Notes

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Started in 1999 by Tomasz Grysztar; supports advanced instruction sets like MMX, SSE, AVX; minimal command-line options; includes macro system; unofficial ARM port exists