Swift Online Compiler

Write, compile, and run Swift code online for free. Use custom standard input and view program output without installing the Swift compiler.

Run the program
Output
Run Swift Code Online
This free Swift online compiler runs a single source file named main.swift in an isolated execution environment. Edit the starter program, provide optional input, and select Run to see standard output and compiler errors.
How to Use the Swift Compiler
  1. Write or paste a complete Swift program in the code editor.
  2. Add input in the Input tab when the program reads from standard input.
  3. Select Run. Compilation errors, runtime errors, and program output appear in the Output panel.
Swift Execution Notes
Top-level Swift statements are supported in main.swift. The source is compiled before the resulting program runs.
Programs can read values using readLine(). Execution time, memory, processes, output size, and network access are limited to keep the shared compiler responsive and secure.
Frequently Asked Questions
Do I need to install Swift?
No. Compilation and execution happen remotely, so the editor works from a modern browser on desktop or mobile.
Can I provide input to my program?
Yes. Enter one or more lines in the Input tab before selecting Run. The text is passed to the program through standard input.
Continue learning with the Swift tutorials and examples.