The best tools to decode (decompile) and encode (recompile) DLL files depend heavily on whether the file is a managed .NET assembly or unmanaged machine code (C/C++).
Decoding a DLL breaks it down into human-readable source code, while encoding packages your edits back into a functional binary.
The top tools are categorized below by their optimal use cases. Top Tools for .NET DLLs (C#, VB.NET)
Managed .NET DLLs store code in Intermediate Language (IL), making them incredibly fast and easy to reconstruct into original C# code. .NET – 7 Decompiler Compared (2026) – NDepend Blog
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