Is PyRun completely free to use?

Yes — PyRun is entirely free. There is no sign-up, no subscription, and no hidden limit. You can write and run Python code as many times as you like without creating an account.

Does PyRun work without an internet connection?

After the first load, PyRun continues to work offline. The Python engine (Pyodide) is cached locally by your browser, so you can keep coding even when you have no internet access. Some features like link sharing require a connection.

Which version of Python does PyRun use?

PyRun runs Python 3.11 via Pyodide, a port of CPython compiled to WebAssembly. You get access to the full Python standard library, including modules like math, json, datetime, itertools, and more.

Is my code private? Does PyRun store what I write?

Your code never leaves your device unless you explicitly generate a public share link. All execution happens entirely inside your browser sandbox. PyRun has no server that receives or stores your code.

Can I use PyRun on a phone or tablet?

Yes. PyRun is built with a responsive layout and works on mobile browsers. The interface adapts to smaller screens, switching to a stacked layout so both the editor and output terminal remain accessible.

Can I import and open my own Python files?

Absolutely. You can open any .py file from your device using the toolbar button or with the Ctrl+O keyboard shortcut. The file loads directly into the editor, ready to run.

How do I share my code with someone else?

Use the Share button in the toolbar or press Ctrl+H. PyRun generates a unique URL that encodes your code. Anyone with the link can open it in their browser and see (or run) the exact same code.

Does PyRun support the input() function?

Yes. PyRun has full support for Python's built-in input() function. When your code reaches an input() call, the terminal prompts you to type a response, just as it would in a local terminal.

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About PyRun

A high-performance, browser-based Python IDE designed for the modern web.

The Mission

We believe development should be frictionless. PyRun provides a zero-setup environment where you can start writing and testing logic in seconds, on any device.

Technology

By leveraging Pyodide and WebAssembly, we bring the full power of a Python 3.11 environment directly to your browser's runtime.

Our Story

PyRun started as an experiment in bringing desktop-level development tools to the browser. As web technologies evolved with WebAssembly and SharedArrayBuffers, we saw an opportunity to create an IDE that feels as fast as a native app while remaining accessible via a simple URL.

Today, PyRun is used by developers for quick prototyping, students for learning Python without installation hurdles, and researchers for sharing interactive code snippets.

Support PyRun

PyRun is built by an independent developer to make learning and testing Python as frictionless as possible. If this tool saves you time, helps your students, or makes your workflow easier, consider buying me a coffee to help support development and keep the project growing!

Buy me a coffee ☕