Online Zig Compiler

Zig is a general-purpose systems language emphasising simplicity, performance, and "no hidden control flow" — no implicit allocations, no hidden type conversions, no preprocessor. The standard library ships with a C/C++ compiler bundled in, so Zig can compile and link against existing C and C++ code without external toolchains.

Zig's compile times are short for tiny files but the toolchain (zig + libc + linker) is still 100MB+ and OS-specific. A browser sandbox is the right tool for trying syntax, validating a buffer trick, or teaching the language without installing anything. The sandbox runs Zig.

Systems programming (Zig is being adopted as a C replacement in some projects), embedded firmware, operating-system development (Zig is used in Bun's JavaScriptCore bindings), the standalone zig build system, and C/C++ interop without an FFI layer. The sandbox compiles to a Linux ELF and exits with the program's return code.

Paste a snippet — const std = @import("std"); pub fn main() void { std.debug.print("hi ", .{}); } — hit Run, see stdout. The highlighter understands Zig's comptime blocks, error unions !T, optionals ?T, and the anytype generics. The default snippet shows a syscall-based exit.

An online Zig compiler here means a real zig toolchain running server-side — not a transpiler or an approximation. Comptime evaluation, explicit allocators, and error-union returns (!T) behave exactly as they would from a local zig build, minus the 100MB+ download and the OS-specific install steps. Think of it as a free Zig interpreter for the kind of five-line question a full project setup would be overkill for: does this comptime block actually evaluate at compile time, or does this error union propagate the way you expect.

Zig positions itself as a C alternative with built-in C/C++ interop, so the Online C Compiler and Online C++ Compiler are natural companions for comparing memory-handling idioms side by side.

To run Zig code in the browser, paste a snippet and press Ctrl+Enter — the sandbox assembles and links it through a genuine toolchain, so what you see in the output panel is real compiler behavior, not a guess. It's a fast way to exercise a comptime branch or confirm how an error union unwraps, without the version juggling that comes from Zig's still-unstable release cadence.

Rust is the other systems language most often compared against Zig's safety model, so the Online Rust Compiler is one click away. The full set of languages lives on the Online Compiler hub.

Zig's breaking changes between minor versions are frequent enough that a script written against 0.9 can fail to compile against 0.11 — installing it locally means picking a version and then tracking when your code falls behind it. This free Zig compiler pins one working toolchain so a shared snippet behaves the same for everyone who opens the link, which is most of what you need for testing a pattern rather than shipping a binary.

For comparing memory and concurrency models, the Online Rust Compiler runs on the same editor, and the free online compiler hub has the rest of the catalogue.