C# and VB.NET assemblies

.NET Decompiler for C# and VB.NET (no need for .NET runtime installed)

Analyze managed EXE and DLL files, inspect .NET IL, reconstruct C# code in licensed editions, and view supported WinForms interfaces even on a system where the target .NET Framework is not installed.

Inspect .NET IL free Compare editions

What VB Decompiler reads from a .NET assembly

IL and metadata

Inspect managed methods, types, references, and Intermediate Language without executing the target program.

C# reconstruction

Licensed editions translate supported C# and VB.NET assemblies into readable C# code for analysis and recovery.

WinForms viewer

Reconstruct supported Windows Forms visually and follow form events to their code.

Offline analysis

The decompiler does not require the target .NET runtime to be installed and can be used fully offline.

Full-size C sharp code reconstruction from a dot NET assembly in VB Decompiler — A full-size managed-code example: reconstructed C# remains available together with assembly structure and IL verification.

Lite versus licensed decompilation

.NET capability	Lite	Licensed editions
Open supported managed assemblies	Yes	Yes
Display .NET IL disassembly	Yes	Yes
Decompile C# or VB.NET code into C#	No	Yes, depending on edition
Visual WinForms reconstruction	See edition chart	Supported

Recovery boundary: VB Decompiler can recover up to 95% of code from a typical supported, non-obfuscated C# or VB.NET assembly, reconstructing it as C#. This is not a guarantee of a project that compiles immediately. Compiler transformations, missing project files and dependencies, unsupported constructs, dynamic code, mixed-mode components, and obfuscation can leave code that must be corrected manually. Visual reconstruction applies to supported Windows Forms; WPF visual reconstruction is not supported at v26.4, but under development.

AI-assisted cleanup when needed

The built-in AI Helper can use a local offline model or the OpenAI API with prepared prompts to explain, restructure, and improve selected recovered C# code. AI suggestions remain part of the recovery workflow and must be checked against IL, metadata, dependencies, and actual application behavior.

A safe offline workflow

Open a copy of the assembly; the target application does not need to run.
Inspect assembly references, types, methods, resources, and IL in Lite.
Use a licensed edition when you need reconstructed C# source.
For supported WinForms applications, use the visual viewer and event links to connect UI behavior to code.
Validate critical logic against IL and test any rebuilt code independently.

Related options

Inspect managed assemblies without installing their runtime

Start with the free Lite edition for .NET IL inspection. A licensed edition adds high-level C# reconstruction and the analysis features needed to investigate and correct the remaining code.

Download Lite free Detailed Features