Obfuscator-LLVM
Obfuscator-LLVM: A free, native-code obfuscator focused on compiler-based control-flow transformations. Ranked #18 of 34 in Code Obfuscation Software by our editors (7.5/10); pricing: Free plan; best for free native-code control-flow obfuscation.
At a glance
- Editor score7.5 / 10
- PricingFree plan
- Best forFree native-code control-flow obfuscation
- Free planYes
- Paid fromFree
- Anti-tamper controlsYes
- Founded2010
- Facts checked21 Sep 2026
Where it wins
- Free and open source with self-hosted deployment
- Multiple control-flow and instruction transformation passes
- Supports Clang, Autotools and Xcode workflows
Where it doesn't
- Does not provide string encryption
- Requires building the compiler locally
- Documentation is dated around LLVM-4.0
Our verdict on Obfuscator-LLVM
Obfuscator-LLVM is an open-source fork of the LLVM compilation suite that applies obfuscation transformations during compilation. It is intended for developers working with C, C++, Objective-C, Ada and Fortran across native targets including x86, x86-64, PowerPC, ARM, SPARC, MIPS and others. Its self-hosted model and free open-source licensing suit teams that want compiler-level control over native-code protection rather than a hosted service or commercial package.
The project’s main strength is the breadth of its documented control-flow tooling. Its passes include control-flow flattening, bogus control flow, instruction substitution and basic-block splitting for flattening, with function annotations for more targeted use. Clang command-line integration provides the primary build path, while Autotools integration and Xcode plugin guidance extend the fit across common LLVM-oriented development workflows. The supported language and architecture coverage also makes it applicable to varied native-code projects.
Obfuscator-LLVM is a focused choice, not a broad protection suite. Its published category specifications include anti-tamper and control-flow obfuscation, but not string encryption, so teams seeking protection for embedded strings should consider an alternative or complementary tool. The documented workflow requires users to build the compiler locally and invoke transformations through Clang flags or build-system variables. Documentation is dated, and LLVM-4.0 is identified as the latest official non-development version. Choose it for free, self-hosted control-flow obfuscation in native builds; avoid it when current documentation, string protection or a managed deployment is a priority.
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Obfuscator-LLVM pricing
Obfuscator-LLVM fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Supported targets | C, C++, Objective-C, Ada, Fortran; x86, x86-64, PowerPC, PowerPC-64, ARM, Thumb, SPARC, Alpha, CellSPU, MIPS, MSP430, SystemZ, XCore |
| Anti-tamper controls | Yes |
| Control-flow obfuscation | Yes |
| String encryption | No |
| Deployment model | Self_hosted |
| Build integration | Cli |
| Deployment | Self-hosted |
| Support | Docs, Community |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 3 integrations: Clang, Autotools, Xcode |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 21 Sep 2026 |
Obfuscator-LLVM integrations
Obfuscator-LLVM lists 3 integrations on its own site.
- Clang
- Autotools
- Xcode
Alternatives to Obfuscator-LLVM
- ByteHide ShieldBroad application protection across .NET, web, Android, and iOS with a free plan.9.4
- JscramblerA focused JavaScript protection suite for teams securing browser and Node.js applications.9.2
- DotfuscatorA broad .NET protection toolkit with a free personal-use entry point and quote-based paid plans.9.0
See all Obfuscator-LLVM alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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