Run Python on Any Page. Right From Chrome.
The Python Compiler extension puts a Run button on Python code across ChatGPT, Claude, Gemini, Stack Overflow, GitHub and the Python docs. Output appears under the code, and everything executes privately on your device.
import statistics
samples = [12.1, 12.4, 11.9, 12.6, 12.0]
mean = statistics.mean(samples)
print(f"mean: {mean:.2f}")
print(f"stdev: {statistics.stdev(samples):.3f}")
Done0.04smean: 12.20 stdev: 0.274
The Run pill and the inline console, exactly as they appear on a supported page.
Stop Copying Code Into Another Tab
Most Python you read is somewhere you cannot run it: an AI chat answer, a Stack Overflow solution, a GitHub file, an example in the official docs. Verifying it means copying, switching tabs, pasting, running and switching back, and by the fifth snippet you have stopped checking.
This extension removes the round trip. Python code blocks get a Run button where they are, output streams in below the code, and error tracebacks come with a one-click prompt to paste back into the AI chat. It is built by the team behind pythoncompiler.io, the free online Python IDE with 116 interactive tutorials.
What It Does
Run Where You Read
A Run pill appears on Python code blocks as you browse. Click it and output streams in right under the code. No copying into another tab, no losing your place in the conversation.
Private by Architecture
Python executes inside the extension, on your device. Code and output are never sent to a server, never logged, never used for anything. There is no account and nothing to sign up for.
Charts Inline
matplotlib figures render as images under the code block. numpy and pandas load automatically the first time a snippet imports them, so data science answers run as written.
Errors Become Prompts
When code from an AI chat fails, one click on "Copy traceback for AI" copies the code and the full error, formatted to paste straight back into the conversation for a fix.
Stop That Actually Stops
Infinite loop in a generated snippet? Stop kills the runtime instantly instead of asking politely. The next run starts fresh, and your tab never freezes.
Side Panel Scratchpad
Click the toolbar icon and a full Python editor opens beside the page you are reading. Ideal for reworking an answer or testing a variation without switching tabs.
Works Where You Read Code
Snippets with >>> REPL prompts, like the official Python tutorial, are cleaned automatically: prompts stripped, echoed output removed, so docs examples run as written. Every site can be toggled off in the extension settings.
Privacy, Checked
Cloud runners execute your code on their servers. This extension does not have a server to send it to: Python runs inside the extension, on your device, the same way the pythoncompiler.io editor works. Your code, its output and your errors stay in your browser. The one network request involved is fetching scientific packages such as numpy from a public CDN the first time a snippet imports them.
That makes it safe for the code you actually work with: snippets containing file paths, data samples or anything else you would rather not paste into a stranger's server.
Frequently Asked Questions
Is the extension free?
Yes, completely free. No account, no trial, no limits on how much code you run.
Is my code sent to a server?
No. Python runs inside the extension, on your device. Your code and its output never leave your browser. The only network activity is downloading packages like numpy or matplotlib from a public CDN the first time a snippet imports them.
Which websites does it work on?
ChatGPT, Claude, Gemini, Stack Overflow, GitHub, GitHub Gists and docs.python.org out of the box. Each site can be toggled off in the extension settings, and more sites are added over time.
Does it handle numpy, pandas and matplotlib?
Yes. Packages load automatically the first time a snippet imports them, and matplotlib figures render as images right under the code block.
What happens with infinite loops?
The Stop button kills the Python runtime instantly rather than asking it to stop. The next run boots a fresh runtime in a moment, so a runaway loop can never lock up your browser tab.
While You Wait
The full editor and all 116 tutorials are already free in your browser.