Online C++ Compiler

Free Online C++ Compiler & IDE

PlayCode's C++ compiler lets you write, compile, and run C++ code directly in your browser. Unlike other online compilers that send your code to remote servers, our C++ online compiler runs 100% client-side, Clang/LLVM compiled to WebAssembly. Your code never leaves your browser.

How to Use This Online C++ Compiler

1. Write your C++ code in the editor panel
2. Press Ctrl+Enter or click Run to compile and execute
3. View output in the Console panel, compilation errors and program output
4. Create multiple files using the file tree, organize headers and source files
5. Your code is auto-saved in your browser, come back anytime

Features

How It Works: Browser-Based Compilation

Our online C++ compiler uses The Clang/LLVM toolchain compiled to WebAssembly. When you click Run, your code is compiled locally in your browser to WebAssembly, then executed using a WASI runtime. This means:

• No server round-trips: Compilation happens instantly on your machine
• Complete privacy: Your code is never uploaded anywhere
• Offline capable: Works without internet after initial load
• No rate limits: Compile as many times as you want

C++ Code Examples

// Your first C++ program
#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}

#include <iostream>
#include <vector>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};

    int sum = 0;
    for (int n : numbers) {
        sum += n;
    }

    std::cout << "Sum: " << sum << std::endl;
    return 0;
}

#include <iostream>
#include <string>

class Person {
public:
    std::string name;
    int age;

    void greet() {
        std::cout << "Hello, I'm " << name
                  << ", " << age << " years old." << std::endl;
    }
};

int main() {
    Person p;
    p.name = "Alice";
    p.age = 25;
    p.greet();
    return 0;
}

Why Use an Online C++ Compiler?

An online C++ compiler is perfect for:

• Learning C++: No need to install Visual Studio, GCC, or Clang
• Quick testing: Test algorithms and snippets without creating projects
• Competitive programming: Practice coding problems anywhere
• Teaching: Students can code without complex setup
• Code interviews: Run C++ code during technical interviews

Compiler Flags & Optimization

Our C++ compiler uses these default flags for optimal performance and helpful warnings:

-O2 -std=c++20 -Wall -Wextra -fno-exceptions

-O2 enables optimization, -std=c++20 enables modern C++ features, -Wall -Wextra enable comprehensive warnings to help you write better code.