Free Online C Compiler

CForge is a free online C and C++ compiler that lets you write, compile, and run code directly in your browser. Every program is compiled with GCC 10.2 and executed in a remote sandbox, so you get real compiler output, warnings, and runtime results in seconds.

There is nothing to install and no account to create. Whether you are learning C for the first time, testing a quick snippet, practicing for an interview, or sharing a bug reproduction with a teammate, CForge gives you a fast, distraction-free environment that works on any device.

How to Use CForge

  1. Write or paste your code

    Write or paste your C or C++ code in the editor.

  2. Add input and arguments

    Add any stdin input or command line arguments if your program needs them.

  3. Compile and run

    Click Run or press Ctrl + Enter to compile and execute instantly.

Features

  • Supports C and C++ with GCC 10.2
  • Syntax highlighting and line numbers
  • Standard input (scanf) support
  • Command line arguments (argc/argv)
  • Shareable links
  • Auto-saves code in browser
  • No signup or installation required

Frequently Asked Questions

Is this C compiler free?

Yes, completely free with no signup required.

Which version of GCC does CForge use?

GCC 10.2 supporting C99, C11, C17, C++11, C++14, C++17.

Does it support scanf and user input?

Yes, use the stdin box on the right panel.

Can I share my code with others?

Yes, click the Share button to copy a link with your code embedded.

Does it support C++?

Yes, switch between C and C++ using the language selector in the top bar.