dotPeek
dotPeek is JetBrains’ free Windows application for inspecting and decompiling .NET assemblies.
What dotPeek is
dotPeek is JetBrains’ free Windows application for inspecting and decompiling .NET assemblies. It translates assemblies into equivalent C# and can also display their underlying IL code. Supported inputs include DLL, EXE, WINMD, and BAML files, plus ZIP, VSIX, and NuGet archives and folders. Decompiled assemblies can be saved as Visual Studio projects in .csproj format. For source lookup, dotPeek can use local PDB files, retrieve source from symbol servers, and generate PDB files. It can act as a symbol server for Visual Studio’s debugger, and provides symbol-usage search, navigation, assembly indexing, and hierarchy views. Assembly Explorer shows references, resources, code, metadata, and dependency diagrams. dotPeek supports bytecode decompilation, not native-code decompilation. It runs on Microsoft Windows, including Windows 10 and 11; listed minimum hardware is a 2 GHz processor, 4 GB of memory, and 400 MB of disk space. The free plan requires no license key. Its license agreement places responsibility on users to confirm decompilation is permitted or obtain the copyright owner’s permission.
Good
- Free, with no license key required
- Decompiles assemblies into C# and can show IL
- Exports decompiled assemblies as .csproj projects
- Can serve Visual Studio’s debugger with symbol information
Watch out
- Windows desktop application only
- Does not decompile native code
- Users must ensure decompilation is permitted
Who it suits
dotPeek suits Windows users who need to inspect .NET assemblies, find source information, or work with compiled assemblies in Visual Studio’s debugger. It is not for native-code decompilation.
Verdict
dotPeek brings assembly browsing, C# decompilation, and Visual Studio debugger support together at no cost. Its Windows-only scope and the license agreement’s permission requirement are important considerations.
Plans and prices
From dotPeek's own pricing page, checked 7 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| dotPeek | Free | Windows desktop application · available as web or offline installer and portable 32-bit/64-bit versions · Free, no license key required. |
The facts
Each one read from dotPeek's own pages, with the date it was checked.
What it does
- Assembly inspection
- Assembly Explorer can show references, resources, code, metadata, and dependency diagrams for assemblies.checked 7 Oct 2026
- Decompilation
- It decompiles .NET assemblies into equivalent C# and can optionally show the underlying IL code.checked 7 Oct 2026
- Hardware requirements
- The listed minimum hardware is a 2 GHz processor, 4 GB memory, and 400 MB disk space.checked 7 Oct 2026
- Integrations
- The download page says the dotUltimate installer can integrate selected products into chosen versions of Visual Studio.checked 7 Oct 2026
- Navigation and search
- It provides symbol usage search, code navigation, assembly indexing, and hierarchy views.checked 7 Oct 2026
- Project export
- Decompiled assemblies can be saved as Visual Studio projects (.csproj).checked 7 Oct 2026
- Purpose
- dotPeek is a free standalone .NET decompiler and assembly browser based on ReSharper’s bundled decompiler.checked 7 Oct 2026
- Security and compliance
- JetBrains says its tools adhere to industry security standards including SOC 2 attestation and links to its Trust Center for reports and summaries.checked 7 Oct 2026
- Source lookup
- dotPeek can identify local source using PDB files, fetch source from symbol servers, and generate PDB files.checked 7 Oct 2026
- Supported inputs
- It supports DLL, EXE, WINMD, and BAML files, as well as ZIP, VSIX, and NuGet archives and folders.checked 7 Oct 2026
- Use restriction
- The license agreement says users must ensure decompilation is permitted by the applicable license or obtain permission from the copyright owner.checked 7 Oct 2026
- Visual Studio debugging
- dotPeek can act as a symbol server that supplies Visual Studio’s debugger with information to debug compiled assemblies.checked 7 Oct 2026
The company
- Founded
- 2000checked 28 Sep 2026
- Headquarters
- Amsterdam, Netherlandschecked 28 Sep 2026
- Maker
- JetBrains says it was founded in 2000 and lists Amsterdam, the Netherlands, as its headquarters.checked 7 Oct 2026
Where it runs
- Platform
- dotPeek is a standalone desktop application for Microsoft Windows, with Windows 10 and 11 listed among its supported operating systems.checked 7 Oct 2026
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