For developers, malware analysts, and reverse engineers, looking inside these compiled files is a common necessity. Whether you need to recover lost source code, debug a third-party library, or analyze a suspicious file, a DLL decompiler is the tool you need.
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DLLs built on Microsoft’s .NET framework do not compile directly into machine code. Instead, they compile into Common Intermediate Language (CIL or IL).
Native DLLs compile directly into x86 or x64 machine code. Online decompilers will struggle with these. The output will be abstract pseudo-code filled with generic variable names like v1 , v2 , and memory offsets like DAT_00403000 . You will need to manually reconstruct the logic. Managed DLLs (.NET / C# / Unity)
: Start with ILSpy on simple .NET DLLs you own, then progress to RzWeb for cross-platform assembly analysis, and finally explore Ghidra for advanced native binary analysis. dll decompiler online exclusive
The user uploads the target .dll file via an HTTPS-encrypted browser session.
Various web-based implementations of ILSpy and DNSpy are now available, acting as an online exclusive service to convert .NET DLLs directly into C#. .NET framework and Core libraries. How to Decompile a DLL Online: Step-by-Step Using an online exclusive decompiler is straightforward:
Are you looking to and recompile it, or just understand how it works ?
Perhaps the most impressive entry in this space is , a complete reverse engineering platform that runs entirely in your browser via WebAssembly. Unlike traditional web tools that upload your files to external servers, RzWeb processes everything locally on your machine—your files never leave your device. Instead, they compile into Common Intermediate Language (CIL
Run complex reverse-engineering tasks on Chromebooks, tablets, or locked-down corporate environments where software installation is prohibited.
Cloud-based tools are continuously updated, ensuring compatibility with the newest .NET frameworks. Key Features of Top-Tier Online DLL Decompilers
Are there strict on these files?
(also known as Dogbolt) is the most comprehensive online tool for decompiling non-.NET DLLs into C-like code. For .NET-based DLLs The output will be abstract pseudo-code filled with
: RzWeb is your best online exclusive option. The files never leave your machine, making it ideal for proprietary or sensitive code analysis.
Modern, open-source decompiler; standard for C# code recovery. Complex Binaries
is a unique web service that acts as a front-end to multiple decompilation engines. Rather than being a single decompiler, it allows you to compare the output of different decompilers on small executables directly in your browser. This comparative approach is valuable for researchers who want to evaluate which decompiler produces the most accurate output for their specific code patterns.