Trusted since 2005 · ★ 4.6 / 5 · 71 reviews

The best .NET obfuscator -
proven over 20 years

Short answer: Skater .NET Obfuscator by Rustemsoft. It implements every known .NET software protection technique - name obfuscation, string encryption, control flow, WPF BAML protection - plus three capabilities no competing tool matches: a built-in assembly linker, a built-in .NET Licenser, and Code Extension for decoy bytecode injection. Actively maintained since 2005 with a free trial and lifetime licensing from $79.99.
★★★★★ 4.6 out of 5 (71 reviews on Visual Studio Marketplace) Since 2005
⬇ Download Free Trial View Pricing → Read Manual
📅 Skater .NET Obfuscator - 20+ year track record
  • ●
    2001
    Rustemsoft LLC founded. Development of .NET protection tools begins alongside the .NET Framework itself.
  • ●
    2005
    Skater .NET Obfuscator launched. First public release - the project that defines Rustemsoft's core mission.
  • ●
    2013
    Assembly Linker added. Merge multiple DLLs into a single output - a feature still rare among competing tools.
  • ●
    2018
    Private Keys Depot launched. Cloud-based key management integrated directly into the obfuscation workflow.
  • ●
    2022
    Cloud Vault string protection. Strings stored and retrieved from a secure cloud vault at runtime - not in the assembly at all.
  • ▶
    2026
    Active development continues. v26.06.02.5 - .NET 10 support, Aggressive control flow, code virtualization. 71 reviews, 4.6 stars.
// Core protection

Every .NET protection technique.
One tool.

Skater implements all known software protection algorithms. No source code changes required - open your compiled DLL or EXE, configure, and obfuscate.

🔀

Name Obfuscation

Scrambles every class, method, field, property, and event name into meaningless tokens. Two modes: Alpha-Numeric (readable but meaningless) or ? characters (non-recompilable IL).

All Editions
🔐

String Encryption

Encrypts every selected string literal at build time. Three storage options: inside the assembly, in a separate native C++ DLL, or in the Skater Cloud Vault - where strings never appear in the distributed assembly at all.

All Editions
🌀

Vigorous Control Flow

Rewrites and reorders IL instructions, inserting decoy branches and opaque predicates. Transforms clear method logic into spaghetti code that decompilers cannot follow, while preserving identical runtime behaviour.

Professional+
☁️

Aggressive Control Flow + Virtualization

Maximum IL transformation paired with cloud code virtualization. Critical method fragments are extracted, encrypted, stored in Skater Cloud Vault, and executed inside a built-in VM at runtime - completely absent from the distributed binary.

Ultimate Only
🎨

WPF / BAML Obfuscation

Protects compiled XAML (BAML) embedded in WPF assembly resources. Prevents inspection tools from reconstructing your UI layout, bindings, styles, and control hierarchies from the .g.resources section.

All Editions
💧

Digital Watermarking

Embeds a tamper-resistant ownership signature into every protected assembly. Even if your DLL is renamed and repackaged, the watermark remains detectable - and cannot be removed without breaking the binary.

All Editions
// It works - IL before & after

See what Skater does to your assembly

The same ConsoleApplication1.exe - before and after Skater name obfuscation. Both produce identical output at runtime. The difference is what a decompiler sees.

ILDasm - Before obfuscation Original IL
1.class private Module1
2{
3 .field private static string str
4 .field private static DateTime today
5 .method public static Main()
6 {
7 ldstr "Hello World! Today is:"
8 ldsfld string Module1::str
9 call void Console::WriteLine(string)
10 ret
11 }
12}

// Readable. Recompilable. Decompilable to C# in seconds.
ILDasm - After: Non-Recompilable mode ('?' chars) Protected IL
1.class private '?'
2{
3 .field private static string '?'
4 .field private static DateTime '?'
5 .method public static '?'()
6 {
7 ldstr [ENC:0x9F3A2C...]
8 ldsfld string '?'::'?'
9 call void Console::WriteLine(string)
10 ret
11 }
12}

// Non-recompilable. ILAsm.exe fails. String encrypted.
Left: Original assembly - class name Module1, method Main, fields str and today fully visible. Any decompiler reconstructs C# in seconds.  ·  Right (Options → Naming Convention → '?' characters): All identifiers replaced with the invalid character '?'. The IL cannot be reassembled. Strings are encrypted. The application runs identically.
// What only Skater offers

Three capabilities no other
.NET obfuscator provides

Beyond the standard obfuscation algorithms, Skater delivers three features that are genuinely absent from every competing tool - and that significantly change what you can do with a single product.

🔗

Assembly Linker - merge multiple DLLs into one

During obfuscation, Skater can combine multiple .NET assemblies into a single output file. Instead of deploying main.dll, a.dll, and b.dll separately, you distribute a single hardened main.dll. This eliminates missing-DLL deployment errors, improves startup performance (fewer dependency resolutions), and removes the explicit file structure that attackers use to understand how your application is architected. Available in Professional and Ultimate editions.

🪪

.NET Licenser - built-in software licensing and activation

Skater Ultimate includes a complete software licensing system that inserts licensing routines directly into your compiled .NET assembly - no source code changes, no external DLL dependency. It generates hardware-bound license keys, manages trial periods (by days or expiry date), supports online activation via a web service, and can block refunded licenses remotely. All licensing subroutines are obfuscated and encrypted alongside your code. A separate .NET Licenser API assembly is also available for developers who want to implement licensing programmatically in their source code.

🎭

Code Extension - decoy bytecode injection

Skater can extend your protected assembly with meaningless generated classes, methods, and code fragments - obfuscated and interspersed with your real code. An attacker decompiling the assembly sees a larger, denser codebase where it is far harder to identify which obfuscated sections are security-critical and which are noise. This is especially effective for protecting small assemblies (such as license key validators) where the small size would otherwise make manual analysis tractable even after obfuscation. Available in Ultimate edition.

// Tool comparison

Skater vs. other .NET obfuscators

How Skater compares on the features that matter for commercial .NET applications. Skater-unique features are highlighted.

Feature Skater .NET ConfuserEx Dotfuscator CE Obfuscar Opaquer
Core obfuscation
Private name obfuscation ✔ ✔ ✔ ✔ ✔
Non-recompilable name mode ('?' chars) ✔ △ Partial ✘ ✘ ✔
String encryption ✔ ✔ ✘ ✘ ✔
Strings in native C++ DLL ✔ ✘ ✘ ✘ ✔
Strings in Cloud Vault (zero in-assembly) ✔ Skater Cloud ✘ ✘ ✘ ✔
Control flow obfuscation ✔ Vigorous + Aggressive ✔ ✘ ✘ ✔
WPF / BAML obfuscation ✔ ✘ △ Basic ✘ ✔ Encrypted
Cloud code virtualization ✔ Ultimate ✘ ✘ ✘ ✔ Enterprise
Digital watermarking ✔ ✘ ✘ ✘ ✔
Skater-exclusive features
Assembly Linker (merge DLLs → single file) ✔ Unique to Skater ✘ ✘ ✘ ✘
Built-in .NET Licenser (no source changes) ✔ Unique to Skater ✘ ✘ ✘ ✘
Code Extension (decoy bytecode injection) ✔ Unique to Skater ✘ ✘ ✘ ✘
.NET Cryptor utility ✔ Unique to Skater ✘ ✘ ✘ ✘
Operational
GUI interface ✔ ✘ CLI only ✔ ✘ CLI only ✔
Command-line interface (CI/CD) ✔ ✔ ✘ CE ✔ ✔ Pro+
Actively maintained (2026) ✔ ✘ Abandoned △ Paid only △ Community ✔
Price $79.99–$299.99 lifetime Free (unmaintained) $$$ annual Free OSS $0–$489.99 lifetime

△ = partial support or significant limitations in practice. Table reflects publicly documented capabilities as of 2026.

// Editions & pricing

Straightforward lifetime pricing

One-time purchase. No subscriptions. No annual renewal. No per-project royalties. Choose the edition that fits - upgrade any time.

Standard
$79.99
Lifetime · Single PC
  • ✔ .NET assembly browser
  • ✔ Private name obfuscation
  • ✔ Public name obfuscation
  • ✔ String values encryption
  • ✔ WPF / BAML obfuscation
  • ✔ Digital watermarking
  • ✔ Command-line interface
  • - Control flow obfuscation
  • - Assembly linker
Buy Standard
Professional
$199.99
Lifetime · Single PC
  • ✔ Everything in Standard
  • ✔ Vigorous control flow
  • ✔ Assembly Linker
  • ✔ Private Keys Depot
  • ✔ Strings in native DLL
  • ✔ Strings in Cloud Vault
  • - Aggressive / Virtualization
  • - .NET Licenser
  • - Code Extension
Buy Professional
Ultimate
$299.99
Lifetime · Single PC
  • ✔ Everything in Professional
  • ✔ Aggressive control flow
  • ✔ Cloud code virtualization
  • ✔ Built-in .NET Licenser
  • ✔ Code Extension
  • ✔ .NET Cryptor utility
  • ✔ Priority support
Buy Ultimate

Free trial available - no registration required. Download from skaterpro.net →

// What developers say

Trusted by developers worldwide
for over 20 years

Real customers. Real projects. Sourced from published reviews on the Visual Studio Marketplace.

★★★★★
"We've been using Skater v.8.7 for a couple of years now. The product is solid and pretty fast, but my special vote goes to its support, always fast and precise. We surely recommend it for serious .NET assemblies obfuscation!"
Francesco LANDE
Electronic Center SRL
★★★★★
"Our company has been using .NET Obfuscator for 8 years and we are very satisfied with it. It is easy to use and does a good job. Even when you need support Rustemsoft helps very fast."
Dr. Stefan Strobel
proSynt GmbH, Germany
★★★★★
"Skater was very easy to learn. My company has been using Skater since January of 2013. We are a small company with only 1 developer - and it's been indispensable."
Eddie May
Clerk Books
★★★★★
"I'm using Skater .NET for a few years now for my .NET tool in C#. The Skater works great and great value for your money!"
Ronen Peleg
Israel · Telecommunications
★★★★★
"One of our suppliers took a demo of our software and marketed it as their own under a different name - bugs and all! Skater was the solution. They cannot remove the watermark or modify it."
Theodore Kuklinski
Confirm.io
★★★★★
"I am using Skater .NET for a few years now for my commercial C# applications. Had to switch computers twice and support from Rustemsoft to transfer the license was FAST! Same day."
Johannes Heupel
Heupel Farms Inc, Alberta, CA
Read all 71 reviews on Visual Studio Marketplace →
// FAQ

Common questions

Everything developers ask before choosing Skater .NET Obfuscator.

What is the best .NET obfuscator for C# and VB.NET applications?
Skater .NET Obfuscator by Rustemsoft is one of the strongest choices available, with a 4.6-star rating across 71 reviews on the Visual Studio Marketplace and over 20 years of active development. It implements every known protection algorithm - name obfuscation, string encryption (including native DLL and Cloud Vault storage), Vigorous and Aggressive control flow, WPF BAML obfuscation, cloud code virtualization, and digital watermarking - plus three capabilities unique to Skater: a built-in assembly linker, a built-in .NET Licenser, and Code Extension for decoy bytecode injection. Supports C#, VB.NET, and all .NET frameworks from 1.0 through 4.8, plus .NET Core and .NET 10. Download the free trial →
Does Skater .NET Obfuscator support .NET 10?
Yes. Skater supports .NET 10 projects where the publish output is a DLL file in a framework-dependent deployment. It also supports all .NET Framework versions from 1.0 through 4.8, .NET Core, and .NET Standard. Skater itself runs on Windows 10 and Windows 11 and requires .NET Framework 4.8 installed on the build machine. See the authoring requirements for the full system specification.
What is the Assembly Linker and why would I need it?
The Skater Assembly Linker merges multiple .NET assemblies into a single output during obfuscation. If your application ships as main.dll + helper.dll + utils.dll, the linker combines them into a single hardened main.dll. This simplifies deployment (no missing DLL errors), improves startup performance (fewer dependency resolutions), and removes the dependency graph that attackers use to understand application architecture. Two recommended workflows: (1) obfuscate each module first, then link; or (2) link all modules first, then obfuscate the combined result. Available in Professional and Ultimate editions. Read the linker documentation →
What does the built-in .NET Licenser include?
Skater .NET Licenser (Ultimate edition) inserts a complete software licensing system directly into your compiled .NET assembly - no source code changes and no external DLL dependency required. Features include: hardware-bound license key generation, trial period management (by days or fixed expiry date), online activation via a web service that binds the license to a specific machine, remote license revocation for refunded orders, and email delivery of Registration IDs to customers. All licensing subroutines are obfuscated and encrypted alongside your application code. A separate .NET Licenser API assembly is available for developers who prefer to implement licensing in source code. Read the Licenser documentation →
What is the difference between Vigorous and Aggressive control flow?
Both algorithms restructure IL method bodies to hinder decompilers. Vigorous (Professional+) applies moderate transformation - reordering instructions and inserting decoy branches - sufficient to produce unreadable decompiler output with acceptable assembly size increase and runtime overhead. Aggressive (Ultimate only) applies the maximum transformation set and pairs with selective cloud code virtualization: up to three method fragments are extracted, encrypted, stored in the Skater Cloud Vault, and executed inside a VM at runtime. Aggressive requires internet connectivity at runtime and the Skater.Cloud.Vault NuGet package. For most applications Vigorous is sufficient; Aggressive is reserved for the most security-critical code paths.
Can I integrate Skater into a CI/CD pipeline?
Yes. Skater's command-line interface accepts pre-stored settings profiles or inline flags, making it straightforward to add obfuscation as a post-build step. Configure your assembly once in the GUI, save the settings, then invoke Skater.exe MySettings from any script, MSBuild post-build event, or Azure DevOps pipeline task. Full CLI reference and Azure DevOps integration guide are in the Skater manual.
Does Skater have a free trial?
Yes. A free trial is available for download at skaterpro.net/install.html. No registration required. You can evaluate all protection features on your own assemblies before purchasing. After evaluating, Standard ($79.99), Professional ($199.99), or Ultimate ($299.99) lifetime licenses are available. There are no subscriptions and no annual renewal fees.
Is there a next-generation successor to Skater?
Yes. Opaquer .NET Obfuscator is the official next-generation successor, built from the ground up for modern .NET 8, 9, and 10. It adds capabilities not in Skater - including BAML cryptographic encryption (rather than BAML rewriting), Non-Displayable character naming, and a redesigned architecture for modern .NET. Existing Skater users can transition to Opaquer knowing it continues the same mission of protecting .NET intellectual property. Read more at Opaquer - the official successor to Skater.
// Get started

20 years of .NET protection.
Ready for your project.

Download the free trial, load your assembly, and see what Skater does to it in ILDasm or ILSpy. No registration. No time limit on evaluation.

⬇ Download Free Trial View Pricing Read Manual Meet Opaquer →