Kotlin Compiler
Code Runners
Online
Compile Kotlin code to JVM bytecode with modern syntax and null safety features.
Source
stdin (optional)
Output
Code is sent to this site's runner service (Piston API) for compilation and execution. Avoid pasting secrets.
How it works
- Paste source code and optional stdin, then click Run.
- This site forwards your snippet to a public compile/run service (Piston API) and shows stdout/stderr here.