What is a .rs file?
Rust Source File · Code and data · Rust project (originally Mozilla) · 2010
A .rs file is Rust source code, a modern systems language focused on speed and memory safety without a garbage collector. It is plain text compiled by the Rust toolchain into fast native binaries.
What is a .rs file used for?
Rust's compiler enforces strict rules about how memory is used, catching whole classes of bugs before the program runs. Projects are usually built with Cargo, which handles dependencies and compilation with cargo build or cargo run.
Rust is used for performance-critical software, command-line tools, WebAssembly and increasingly parts of operating systems. The source files are plain text; VS Code with rust-analyzer is a common setup.
How to open a .rs file
The .rs format opens in the following apps, grouped by operating system. If one app does not work, try another from the same list. For a step-by-step walkthrough, see how to open a .rs file.
Windows
- VS Code
- RustRover
- any text editor
macOS
- VS Code
- RustRover
- any text editor
Linux
- VS Code
- vim
- any text editor
How to convert a .rs file
You can convert a .rs file to exe (via cargo build), wasm using a conversion tool or the export menu of an app that opens it.
.rs file signature (magic bytes)
Programs recognise a .rs file by the bytes at the start of the file, not by its name. These are the signatures for Rust.
| Hex signature | Offset | Note |
|---|---|---|
| (no fixed signature) | 0 | plain text; no fixed magic bytes |
See the full magic-numbers reference for every format.
Frequently asked questions
What is a .rs file?
A .rs file is Rust source code, a modern systems language focused on speed and memory safety without a garbage collector. It is plain text compiled by the Rust toolchain into fast native binaries.
How do I run a .rs file?
In a Cargo project, cargo run builds and runs it. A single file can be compiled directly with rustc file.rs and then executed.
How do I open a .rs file?
Any text editor opens it. VS Code with the rust-analyzer extension adds completion, type hints and error checking.
Why is Rust considered safe?
Its compiler tracks ownership and borrowing of memory, preventing use-after-free and data races at compile time without a garbage collector.
Related formats
Sources
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