Garble
Garble is a free command-line tool that wraps the Go toolchain to obfuscate builds while aiming to preserve their behavior.
What Garble is
Garble is a free command-line tool that wraps the Go toolchain to obfuscate builds while aiming to preserve their behavior. It supports `garble build`, `garble test`, and `garble run`, as well as commands for reversing obfuscated text and filing bug reports. Garble replaces identifiers and package paths with short base64 hashes, and removes build, module, and debug information. The optional `-literals` flag changes eligible literal expressions into more complex expressions with the same runtime value. The optional `-tiny` flag removes additional binary information and can make binaries about 15% smaller, but it also removes panic output, which can make crashes harder to debug. Builds are deterministic with the same inputs, and stack traces can be de-obfuscated when the necessary inputs are available. A Garble build should take about twice as long as `go build`, since it performs both an original and obfuscated build. It requires Go 1.27 or later. Exported methods and Go plugins are not currently supported for obfuscation, and some runtime APIs will not work in obfuscated binaries.
Good
- Free Go build obfuscation tool.
- Supports build, test, and run commands.
- Deterministic builds with the same inputs.
- Optional tiny mode can reduce binaries about 15%.
Watch out
- Requires Go 1.27 or later.
- Builds should take about twice as long as go build.
- Exported methods and Go plugins are not obfuscated.
- Tiny mode removes panic output.
Who it suits
Garble suits Go developers sharing binaries whose source is private or requires purchase and who want to discourage reverse engineering. It is intended for command-line build workflows.
Verdict
Garble offers several ways to obfuscate Go builds, but its unsupported methods, plugins, and runtime APIs matter when planning compatibility. Account for the longer build time and reduced crash details with tiny mode.
Plans and prices
From Garble's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Garble | Free | Free Go code obfuscator; requires Go 1.27 or later |
The facts
Each one read from Garble's own pages, with the date it was checked.
What it does
- Build commands
- It supports garble build, garble test, and garble run, plus commands to reverse obfuscated text and file bug reports.checked 8 Oct 2026
- Build time
- A garble build should take about twice as long as go build because it completes an original build and an obfuscated build.checked 8 Oct 2026
- Identifier obfuscation
- It replaces identifiers and package paths with short base64 hashes.checked 8 Oct 2026
- Limit: exported methods
- Exported methods are not currently obfuscated because they may be required by interfaces.checked 8 Oct 2026
- Limit: plugins
- Go plugins are not currently supported.checked 8 Oct 2026
- Limit: runtime APIs
- APIs such as runtime.GOROOT and runtime/debug.ReadBuildInfo will not work in obfuscated binaries.checked 8 Oct 2026
- Literal obfuscation
- The optional -literals flag replaces eligible literal expressions with more complex expressions that resolve to the same runtime value.checked 8 Oct 2026
- Metadata removal
- It removes build, module, and debug information from obfuscated builds.checked 8 Oct 2026
- Purpose
- Garble wraps the Go toolchain to obfuscate Go builds while aiming to preserve their behavior.checked 8 Oct 2026
- Release signing
- The v0.18.0 release page says its tag was signed with the committer’s verified signature.checked 8 Oct 2026
- Reproducible builds
- Garble builds are deterministic given the same inputs, and its reverse command can de-obfuscate stack traces when the needed inputs are available.checked 8 Oct 2026
- Supported packages
- Garble obfuscates supported packages being built, including the standard runtime, while runtime/cgo and crypto/internal/fips140 are excluded.checked 8 Oct 2026
- Tiny mode
- The optional -tiny flag removes more binary information and can make binaries about 15% smaller, but removes panic output and can make crashes harder to debug.checked 8 Oct 2026
- Use case
- The project describes obfuscation as useful when sharing Go binaries whose source is private or requires purchase, to help discourage reverse engineering.checked 8 Oct 2026
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