Code Quality Rank: L1
Monthly Downloads: 271
Programming language: C#
License: Copyright 2011-2015 AlphaSierraPapa
Tags: Decompiler     ILSpy     C#    

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ILSpy Join the chat at https://gitter.im/icsharpcode/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)

CI Build Nuget Feed (master): https://ci.appveyor.com/nuget/ilspy-masterfeed

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.

Included open-source libraries:

  • Mono.Cecil: MIT License (part of ILSpy)
  • LightJson: MIT License (part of ICSharpCode.Decompiler)
  • Humanizer: MIT License (part of ICSharpCode.Decompiler)
  • AvalonEdit: MIT License
  • SharpTreeView: LGPL
  • ILSpy.BamlDecompiler: MIT license
  • CommandLineUtils: Apache License 2.0 (part of ICSharpCode.Decompiler.Console)

How to build


  • Install Visual Studio (minimum version: 2017.7) with the following components:
    • Workload ".NET Desktop Development"
    • .NET Framework 4.6.2 Targeting Pack (if the VS installer does not offer this option, install the .NET 4.6.2 developer pack separately)
    • Individual Component "VC++ 2017 version 15.9 v14.16 latest v141 tools" (or similar)
    • The VC++ toolset is optional; if present it is used for editbin.exe 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.
  • Install the .NET Core SDK 2.2
  • Install the .NET Core SDK 3
  • 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


  • Make sure .NET Core 2.2 is installed (you can get it here: https://get.dot.net).
  • Make sure .NET Core SDK 3 is installed.
  • 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 (cli and powershell core).

(Visual Studio for Mac users only:)

  • Edit \ICSharpCode.Decompiler\ICSharpCode.Decompiler.csproj Add Sdk="Microsoft.NET.Sdk" to the Project element. This is required due to a tooling issue. Please do not commit this when contributing a pull request!
  • Use Frontends.sln to work.

How to contribute

Current and past contributors.

*Note that all licence references and agreements mentioned in the ILSpy README section above are relevant to that project's source code only.