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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Privacy Policy

1. Data Collection and Usage

PyRun is built on a privacy-first architecture. We do not require registration, and we do not collect personally identifiable information (PII) such as your name, email address, or physical address unless you voluntarily provide it when contacting support.

We may collect non-personal, aggregated telemetry data such as browser type, operating system, and geographic region via third-party analytics (e.g., Google Analytics) to help us optimize the performance of our WebAssembly execution environment.

2. Code Privacy and Execution

When you write and execute Python code in PyRun, the entire execution lifecycle occurs locally within your browser's memory using Pyodide (a WebAssembly port of CPython). Your code is never transmitted to, processed by, or stored on our servers during standard execution.

3. Shared Content via Link Generation

If you utilize the "Share" feature to generate a shareable URL, your code snippet is securely uploaded to our database to generate a unique identifier. This content becomes public, and anyone with the generated link can view and run the code. Do not share sensitive information or proprietary algorithms using this feature.

4. Cookies and Browser Storage

We use your browser's LocalStorage and IndexedDB to save your current project state, active files, and editor settings. This ensures you can resume your session seamlessly after navigating away or working offline. This data remains on your local machine and is never synced to our servers.

Third-party vendors, including Google, use cookies to serve ads based on your prior visits to our website. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to this site and/or other sites on the Internet.

Last updated: April 2026. If you have any privacy-related questions, please contact theprojectlimitless@outlook.com..