Free Python Compiler Online

Run Python 3 code instantly in your browser with our free online Python compiler. Supports all standard library modules with sandboxed Docker execution.

Our free online Python compiler lets you write, run, and test Python 3 code instantly in your browser — no installation, no configuration, no waiting. Powered by a sandboxed Docker container running Python 3.11, every execution is isolated, secure, and destroyed after 5 seconds. Whether you are learning Python for the first time, testing a quick algorithm, or verifying a code snippet, FlexyPdf's Python compiler gives you a full-featured Monaco code editor with syntax highlighting, line numbers, and auto-formatting. Paste your code or type from scratch, click Run, and see the output immediately. The execution environment includes the complete Python standard library — print, math, json, datetime, collections, itertools, and more. No external packages or pip installs are supported, but the standard library covers the vast majority of learning and testing use cases.

How to Use Python Compiler

Write Your Python Code

Type or paste your Python 3 code into the Monaco editor. You get full syntax highlighting, auto-indentation (4 spaces), and line numbers. Click "Example" to load starter code.

Click "Run Python"

Press the Run Python button. Your code is sent to a sandboxed Docker container running Python 3.11-alpine, executed securely with a 5-second timeout, and the output is streamed back.

View Output and Errors

Output (stdout) appears in green in the console below. Errors and tracebacks (stderr) appear in red. You can copy the code, clear the editor, or run again immediately.

Features

Python 3.11 Runtime

Full CPython 3.11 runtime with complete standard library. Supports f-strings, type hints, match statements, and all modern Python features.

Monaco Code Editor

Professional-grade code editor with Python syntax highlighting, line numbers, bracket matching, multi-cursor editing, and automatic indentation.

Docker Sandboxing

Code runs in an isolated Docker container with 128 MB memory and 1 CPU core limit. The container is destroyed after each execution — your code never persists on the server.

5-Second Timeout

Infinite loops and long-running processes are automatically killed after 5 seconds, protecting system resources and giving immediate feedback.

Benefits of Using Python Compiler

Completely Free

Use Python Compiler without any cost, limits, or hidden fees. No premium plans needed.

No Installation

Works directly in your browser. No software downloads or plugins required.

100% Private

Your files and data are processed locally. Nothing is uploaded to external servers.

Works Everywhere

Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.

No Sign-Up

Start using the tool immediately. No account creation or email verification.

Always Available

Access this tool 24/7 from anywhere in the world, on any device.

Frequently Asked Questions

Not in the current version — the execution environment uses the Python standard library only. This covers most learning and algorithm testing needs. Full package support is planned for a future update.

Yes, completely free with no limits, no sign-up, and no hidden fees. Run as many Python programs as you need.

Python 3.11-alpine. It supports all Python 3.11 syntax including match-case, walrus operator :=, f-strings, and type hints.

Each execution runs in a fresh, isolated Docker container with no network access, limited memory (128 MB), and a 5-second timeout. The container is permanently deleted after execution.

No — the runner is headless and does not have a display server. It is designed for console programs that use print() for output.