How does Zee Code Runner work?

Zee Code Runner sends your source code to isolated Docker containers powered by the Piston execution API. It compiles your code on secure servers and streams standard output (stdout), errors (stderr), and exit codes back to your terminal in milliseconds.

Which programming languages are supported for compilation?

We support 15 programming languages including Python 3, JavaScript (Node.js), C++, C, Java, C#, PHP, Go, Rust, TypeScript, SQL (SQLite), Ruby, Swift, Kotlin, and live HTML/CSS/JS web templates.

How do Desktop, Tablet & Mobile Preview viewports work?

When working in HTML mode, click the Desktop (100%), Tablet (768px), or Mobile (375px) buttons in the header or fullscreen modal to test your CSS media queries and responsive page design in real-time.

Is code execution isolated, private, and secure?

Yes. All backend compilation runs inside ephemeral, non-root Linux containers with strict CPU and memory limits. HTML and JS previewing happens 100% locally inside your browser's client-side memory.

How do I pass custom Standard Input (STDIN) to programs?

Expand the 'Standard Input (STDIN)' box below the code editor and type your input values (one per line). When you click Run Code, those inputs are passed directly to Python's input() or C++'s cin.

Are there compilation limits or hidden fees?

No. Zee Code Runner is 100% free with unlimited compilations. There are no paywalls, hidden subscriptions, or account creation requirements.

Can I copy and download source code files instantly?

Yes! Click the 'Copy' button to copy code directly to your clipboard, or click 'Download' to save your project as a native file (e.g. main.py, index.html, main.cpp).

How does the Full Screen IDE mode function?

Click the 'Full Screen' button in the Live Preview panel header to launch a full-screen interactive viewport backdrop. It gives you an unconstrained view of your web page with instant device switcher pills.

Can I import external JS libraries or CSS frameworks?

Yes! In HTML mode, you can link any public CDN stylesheet or script tag (e.g. Tailwind CSS, FontAwesome, Bootstrap, React CDN) inside and it will load live in the preview.

Why choose Zee Code Runner over desktop IDEs?

Setting up heavyweight IDEs like Visual Studio, Eclipse, or Xcode takes gigabytes of disk space and complex compiler path configuration. Zee Code Runner runs instantly on any device, Chromebook, or browser with zero setup.

Zee Code Runner | Multi-Language Online Compiler & IDE

Developer Guide & Reference

The Complete Guide to Zee Code Runner & Web IDE Studio

Learn how Zee Code Runner empowers software developers, students, and web designers to write, debug, compile, and preview code across 15 programming languages instantly inside the browser with zero local environment setup.

How to Use Zee Code Runner

Follow these 5 quick steps to compile code and test web designs

Select Language

Pick Python, C++, Java, JS, HTML, Go, Rust, or SQL from the interactive catalog grid.

Write or Paste Code

Write code in the editor or click Sample to load starter algorithms.

Add STDIN Inputs

Expand the STDIN box to supply CLI input lines for input() or cin functions.

Run & Test Devices

Click RUN CODE (Ctrl+Enter) and toggle Desktop, Tablet, or Mobile views.

Export & Download

Copy terminal outputs or download source files (.py, .cpp, .html) in 1-click.

Sandboxed Multi-Language Compiler Architecture

Traditional programming required installing multi-gigabyte Software Development Kits (SDKs), compilers, and IDE packages like Visual Studio, Eclipse, or Xcode. Zee Online Code Compiler Studio replaces complex local installations with a lightweight, browser-accessible IDE powered by the industry-standard Piston Execution API.

When you press Ctrl + Enter, your source code is packaged and dispatched to ephemeral Linux containers. Each code execution is strictly isolated with non-root security privileges, 10-second timeout enforcement, and millisecond runtime measurement.

15 Supported Programming Languages & Compilers

Our studio supports a comprehensive matrix of modern and classic programming languages:

Python 3.10: Data structures, math, string parsing & algorithms.
C++ 17 & C 10: High-performance system code & competitive programming.
Java 15 & C# 6: Enterprise object-oriented application development.
JavaScript & TypeScript: Node.js backend execution & ES6 syntax testing.
Go 1.16 & Rust 1.68: Modern memory-safe concurrency & systems code.
PHP 8.2 & Ruby 3.0: Web backend scripting & string manipulation.
SQL (SQLite 3): Relational database schema creation & query execution.
Swift 5.3 & Kotlin 1.8: Mobile application logic development.

Live HTML/CSS Sandbox with Mobile & Tablet Previewing

Frontend web design requires constant responsiveness checking across screens. Our Live HTML/CSS/JS Sandbox equips developers with multi-file tabs for index.html, styles.css, and script.js.

With real-time DOM rendering, you can switch viewports effortlessly between Desktop (100% viewport width), Tablet (768px bezel frame), and Mobile (375px smartphone frame). You can also expand to Full Screen Modal for client presentations or full-viewport testing.

Interactive STDIN Inputs & Developer Workflows

Unlike basic code runners that fail on interactive terminal prompts, Zee Code Compiler Studio includes a dedicated Standard Input (STDIN) pipeline. Pass multi-line input streams directly to Python input(), C++ cin, or Java Scanner without code crashing.

Boost your productivity with 1-click Copy Code, Clear Screen, and native file Download shortcuts for your local development workflow.

Standard Input (STDIN)

Pass multi-line inputs to CLI algorithms.

Multi-Device Preview

Test Desktop, Tablet, and Mobile viewports.

Millisecond Execution

Instant Docker container output streaming.

Keyboard Shortcuts

Press Ctrl + Enter to run code instantly.

1-Click File Export

Download .py, .cpp, .html, .js native files.

100% Free & Isolated

Unlimited compilations with zero signups.

Zee Code Runner

Select a Language to Start Coding