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by icsharpcode

icsharpcode /ILSpy

.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

10.8K Stars 2.2K Forks Last release: 12 days ago (v6.1) 6.0K Commits 51 Releases

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ILSpy NuGet Build status Twitter Follow ILSpy VS extension Build Status

ILSpy is the open-source .NET assembly browser and decompiler.

Download: latest release | latest CI build (master) | Microsoft Store (RC & RTM versions only)

CI Build Nuget Feed (master):

Decompiler Frontends

Aside from the WPF UI ILSpy (downloadable via Releases, see also plugins), the following other frontends are available:


  • Decompilation to C#
  • Whole-project decompilation (csproj, not sln!)
  • Search for types/methods/properties (substring)
  • Hyperlink-based type/method/property navigation
  • Base/Derived types navigation, history
  • BAML to XAML decompiler
  • Extensible via plugins (MEF)
  • Check out the language support status


ILSpy is distributed under the MIT License. Please see the About doc for details, as well as third party notices for included open-source libraries.

How to build

Windows: - Install Visual Studio (documented version: 16.4) with the following components: - Workload ".NET Desktop Development". This includes by default .NET Framework 4.8 SDK and the .NET Framework 4.7.2 targeting pack, as well as the .NET Core 3.1 SDK (ILSpy.csproj targets .NET 4.7.2, and ILSpy.sln uses SDK-style projects). - Workload "Visual Studio extension development" (ILSpy.sln contains a VS extension project) - Individual Component "MSVC v142 - VS 2019 C++ x64/x86 build tools (v14.23)" (or similar) - The VC++ toolset is optional; if present it is used for


to modify the stack size used by ILSpy.exe from 1MB to 16MB, because the decompiler makes heavy use of recursion, where small stack sizes lead to problems in very complex methods. - Check out the ILSpy repository using git. - Execute

git submodule update --init --recursive

to download the ILSpy-Tests submodule (used by some test cases). - Open ILSpy.sln in Visual Studio. - NuGet package restore will automatically download further dependencies - Run project "ILSpy" for the ILSpy UI - Use the Visual Studio "Test Explorer" to see/run the tests

Note: Visual Studio 16.3 and later include a version of the .NET Core SDK that is managed by the Visual Studio installer - once you update, it may get upgraded too. Please note that ILSpy is only compatible with the .NET Core 3.1 SDK and Visual Studio will refuse to load some projects in the solution (and unit tests will fail). If this problem occurs, please manually install the .NET Core 3.1 SDK from here.

Unix / Mac: - Make sure .NET Core 2.1 LTS Runtime is installed (you can get it here: - Make sure .NET Core 3.1 SDK is installed. - Make sure PowerShell is installed (formerly known as PowerShell Core) - Check out the repository using git. - Execute

git submodule update --init --recursive

to download the ILSpy-Tests submodule (used by some test cases). - Use

dotnet build Frontends.sln

to build the non-Windows flavors of ILSpy (.NET Core Global Tool and PowerShell Core).

How to contribute

Current and past contributors.

Privacy Policy for ILSpy

ILSpy does not collect any personally identifiable information, nor does it send user files to 3rd party services. ILSpy does not use any APM (Application Performance Management) service to collect telemetry or metrics.

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