main.py×
# Welcome to Online Python IDE!
# Write/Copy your python code here and click 'Run Code'
print('Hello, World!')
Free Online Python IDE — Run Python 3.13 in Your Browser, No Installation Needed
PythonMastery is a free, browser-based Python IDE powered by Pyodide 0.28 (WebAssembly), running Python 3.13 — the latest stable release. Write and execute Python code instantly — no pip install, no setup, no account required. Everything runs 100% locally on your device. Your code never reaches our servers.
Why use PythonMastery?
- Zero setup — Open your browser, start coding Python immediately. No download, no install.
- Privacy first — Code runs locally via WebAssembly. Nothing is sent to any server.
- No login required — No account, no subscription, no email. Just open and code.
- Professional code editor — CodeMirror 6 with syntax highlighting, code folding, find & replace, bracket matching, auto-indent, and live syntax checking.
- Full library support — Install NumPy, Pandas, Matplotlib, Scikit-learn, SciPy, Seaborn, and hundreds more directly in the browser via micropip.
- Data visualization — Create charts, plots, and 3D figures with Matplotlib. Plots render as high-resolution images with download and copy options.
- 3 theme modes — Dark, Light, and Eye Saver themes with matched editor, console, and toolbar styling.
- Mobile friendly — Full IDE experience on phones and tablets with native touch selection, responsive layout, and optimized controls.
- Learn Python online — Structured courses in Python Academy, hands-on exercises in Tutorial Lab, and a Recipe Library of ready-to-run code templates.
- Session restore — Your code, open tabs, and progress are saved locally. Come back after a day, a week, or a month — everything is exactly where you left it.
- Time Travel history — Your code is auto-saved as you type. Made a mistake? Roll back to a recent version with one click.
- Share your code — Generate a shareable link that encodes your code in the URL. No server storage needed.
- Expand view — Expand both editor and console to full viewport height for a distraction-free coding experience. One click to expand, one click to restore.
- Break reminder — After 90 minutes of active coding, a gentle reminder nudges you to take a break. Your health matters as much as your code.
- Interactive input — Use Python's
input()function with an inline text field right in the console. Build interactive programs that prompt for user input. - Stop execution — Running an infinite loop or long computation? Hit the Stop button to interrupt execution instantly — no need to refresh the page.
- Live weather effects — Real-time weather animations in the background based on your location — rain, snow, thunderstorms, sunshine, and more.
- Keyboard shortcuts — Press Ctrl+Enter (Cmd+Enter on Mac) to run your code instantly without reaching for the Run button.
- Multi-tab editor — Work on multiple files side by side with a tabbed editor. Create, rename, and switch between files seamlessly.
- Flexible layout — Switch between horizontal (editor on top, console below) and vertical (side by side) layouts to match your workflow.
Frequently Asked Questions
- Can I run Python in a browser without installing anything?
- Yes. PythonMastery uses Pyodide — a WebAssembly port of CPython — to run Python 3.13 entirely in your browser. No installation of Python, pip, or any tool is needed.
- Is my Python code private and secure?
- Completely. Your code executes locally on your machine and is never transmitted to any server. We have no access to what you write or run.
- What Python libraries are available online?
- You can install and use NumPy, Pandas, Matplotlib, Scikit-learn, SciPy, Seaborn, Pydantic, and hundreds of other pure-Python packages directly in the browser via micropip.
- Can I create charts and visualizations in the browser?
- Yes. Matplotlib works fully in PythonMastery — including 3D surface plots. All charts render as high-resolution PNG images inline in the console, with options to download or copy.
- Does it work on mobile devices?
- Yes. PythonMastery is fully responsive and works on phones and tablets. The editor supports native touch selection with drag handles, and the layout adapts to portrait and landscape orientations.
- Is this Python online compiler free?
- Yes, PythonMastery is completely free, supported by non-intrusive ads. No paid plans, no feature paywalls.
- Can I learn Python for free here?
- Yes. Python Academy offers structured learning paths from beginner to advanced, covering Python fundamentals, data science, machine learning, and AI — all free, all in the browser.
- Can I use input() in the browser?
- Yes. PythonMastery supports Python's input() function with an inline text field in the console. You can build interactive programs that prompt for user input — no popups or workarounds needed.
- Can I stop a running Python script?
- Yes. Click the Stop button to interrupt execution at any time. It works for infinite loops, long computations, and even input() prompts. If a graceful stop isn't possible, the environment automatically restarts.
Our Mission
Not everyone has a laptop on their desk. Some learners start with just a phone and a dream to code. PythonMastery was built for them — and for everyone.
We designed every pixel to feel alive — vibrant gradients, smooth animations, a fresh look that breaks away from the cold, conventional editors you're used to. Because learning should feel exciting, not intimidating.
Whether you're on a phone in a coffee shop, a tablet on your commute, or a desktop at home — PythonMastery gives you the same powerful IDE, the same 80+ lessons, the same experience. No install. No sign-up. No barriers.
Python shouldn't be locked behind expensive hardware or complicated setups. Open your browser. Start coding. That's it.
And we're just getting started. We have a roadmap full of ideas to make PythonMastery even more resourceful — more lessons, smarter tools, better experiences. But we can't build it alone. Your feedback shapes what comes next. Tell us what you love, what's missing, what would make this your go-to place to learn Python.
This isn't just our journey — it's yours too. Let's build it together.
