Online Python Compiler

Use the Online Python Compiler to run and test Python instantly from any device — a phone, a Chromebook, or a locked-down work laptop where you can't install software. Pick the Python version you need (3.13, 3.12, or 3.11), press Run, and your code executes in seconds with full output and tracebacks.

Unlike most online compilers, everything runs 100% in your own browser via WebAssembly. You can even pip-install real packages like numpy, pandas, and requests, and share a runnable link to your snippet.

Because it runs on WebAssembly, it doubles as a safe Python sandbox: the runtime has no filesystem, no network sockets, and no OS access, so you can run untrusted or unfamiliar code safely — classic malware simply can't function. See how real Python sandboxing works in our guide to running untrusted Python safely.

The Online Python Compiler runs real CPython directly in your browser using WebAssembly (Pyodide). That gives you a real advantage over most online compilers: no artificial time limit, because it runs on your own machine's CPU. Paste your code, press Run, and you get the same output and tracebacks you'd see from running python your_script.py locally.

You can choose the exact Python version — 3.13, 3.12, or 3.11 — from the dropdown. Each version loads the matching CPython build on demand, so you can confirm how your code behaves on a specific interpreter (useful when a feature, syntax, or library only works on certain versions). Modern language features — f-strings, match statements, type hints, dataclasses, comprehensions, async/await — all work exactly as they do in native Python.

It supports real pip installs through micropip: type packages like numpy, pandas, requests, sympy, or scikit-learn into the packages box and they're fetched from PyPI and loaded before your code runs. We tested 24 packages and documented which ones work — the scientific stack and common utilities do; native-extension packages like PyTorch and TensorFlow don't. The full Python standard library (json, re, math, itertools, collections, datetime, and more) is available with no install at all.

Because it runs client-side in a WebAssembly sandbox, it can't touch your files or operating system, so it's safe to paste and run code you're still reasoning about. The trade-offs versus a native environment: packages need a WebAssembly-compatible build (most pure-Python and scientific packages have one), there's no subprocess or true multithreading, and network access goes through the browser rather than raw sockets.

This compiler is built to fit a real workflow, not just serve as a scratchpad. Write and test your script here, then continue through the Pyobfuscate suite in one click: format it to PEP 8, lint it with Ruff, type-check it with mypy, protect it with the AST obfuscator so it can't be copied, or package it into a standalone executable. The 'Obfuscate this code' button sends your tested script straight to the obfuscator.

Curious how code runs client-side here? See how Python runs in the browser, or use this compiler as a safe sandbox for untrusted code.