SMX Decompiler Online
Decompile SourceMod SMX plugins back to SourcePawn source code.
How It Works
Upload
Drag and drop your .smx file or click to browse.
Decompile
Lysis converts SourcePawn bytecode to source code.
Browse
View the recovered SourcePawn code in your browser.
What is SourceMod?
SourceMod (SM) is a server modification framework for games built on Valve's Source engine. It allows server administrators to extend game functionality through plugins written in SourcePawn. SourceMod has a massive community with thousands of plugins available for games like Counter-Strike, Team Fortress 2, and Left 4 Dead.
SourceMod plugins can modify nearly every aspect of a game server: custom game modes, admin commands, player statistics, anti-cheat measures, map voting, weapon modifications, and much more.
What is an SMX File?
An SMX file is the compiled binary format for SourceMod plugins. When a SourcePawn script (.sp file) is compiled using the spcomp compiler, it produces an SMX file containing:
- Bytecode — compiled SourcePawn instructions for the SourceMod virtual machine
- Native references — calls to built-in SourceMod functions and extension APIs
- Public functions — exported functions that SourceMod calls (event handlers, command callbacks)
- String table — string constants used in the plugin
- Debug information — variable names and line numbers (if compiled with debug flags)
SourcePawn Language
SourcePawn is a C-like scripting language designed specifically for SourceMod. It features:
- C-style syntax with functions, variables, arrays, and control flow
- Handle-based object system for managing game entities and data structures
- Native functions that interface directly with the game engine
- Forward declarations for event hooks and callbacks
- An include system for sharing code between plugins
Common Uses for SMX Decompilation
- Learning from existing plugins — study how popular plugins implement specific features
- Recovering lost source code — when the .sp source file is lost but the compiled .smx still exists
- Compatibility fixes — modify plugins for newer SourceMod versions or game updates
- Security analysis — check plugins for malicious behavior before installing on your server
Frequently Asked Questions
What is an SMX file?
An SMX file is a compiled SourceMod plugin containing SourcePawn bytecode. SourceMod is a modding framework for Source engine games like Counter-Strike and Team Fortress 2.
What is SourcePawn?
SourcePawn is a C-like scripting language for writing SourceMod plugins. It compiles to SMX bytecode and has support for handles, natives, forwards, and other SourceMod-specific constructs.
What games use SourceMod?
SourceMod runs on Source engine game servers: Counter-Strike: Source, CS:GO, Team Fortress 2, Left 4 Dead 2, Day of Defeat: Source, and Half-Life 2: Deathmatch.