Online Compiler & Code Editor
Write, compile, and run code in 20+ programming languages. Free, fast, and runs entirely in your browser. Powered by NextLeet.
Write, Compile & Run Code Online
NextLeet Playground is a free online compiler and code editor that runs entirely in your browser. Write code in Python, C++, Java, JavaScript, Go, Rust, and 15+ other languages, then compile and execute it instantly. No downloads, no sign-ups, no setup.
How to Use This Online Compiler
- Choose a language: Select from 20+ supported languages using the dropdown above the editor.
- Write your code: The Monaco editor provides syntax highlighting, auto-completion, and bracket matching.
- Add input (optional): If your program reads from stdin, enter the input in the Input panel.
- Click Run Code, or press Ctrl+Enter to execute. Results appear in the Output panel with execution time and memory usage.
Supported Programming Languages
NextLeet Playground supports a wide range of languages for learning, prototyping, and competitive programming. Each language runs on a secure sandboxed server.
Why Use NextLeet Online Compiler
No Setup Required
Skip installing compilers, IDEs, and toolchains. Open the page and start coding in seconds. Works on any device with a modern browser.
Professional Editor
Powered by Monaco, the same editor behind VS Code. Get syntax highlighting, IntelliSense, bracket matching, and keyboard shortcuts you already know.
20+ Languages
From Python and JavaScript to Rust and Haskell. One tool for everything: learning a new language, testing snippets, or solving competitive programming problems.
Fast & Secure
Code executes in isolated sandboxed containers. Results return in seconds. Your code is never stored on our servers. It runs and the result is returned immediately.
Popular Language Guides
Python Compiler Online
Run Python 3 code online with NextLeet. Our Python playground supports standard library imports, stdin input, and prints output in real time. Great for learning Python, testing algorithms, or quick scripting without a local environment.
C++ Compiler Online
Compile and run C++ code using GCC 9.2.0. The editor provides C++ syntax highlighting and auto-complete. See compilation errors and program output side by side. Ideal for competitive programming practice and DSA problem solving.
Java Compiler Online
Write and run Java programs with OpenJDK 13. The boilerplate includes a ready-to-go Main class so you can start coding immediately. Test Java code for interviews, coursework, or side projects.
JavaScript Playground Online
Execute JavaScript using Node.js 12. Test functions, algorithms, and data structures in a clean environment. Supports require() for built-in Node modules and reads stdin for interactive programs.