Pyodide · Python 3.12 · Runs entirely in your browser
Python Online Compiler & Playground
A free Python interpreter that runs in your browser. No signup, no server, your code never leaves your laptop. Includes the full Python standard library — collections, heapq, itertools, functools, re, json, all your interview favorites. First load takes ~5 seconds (downloads the runtime); after that, every run is instant.
Output
Idle
Tips
- Ctrl+Enter (or ⌘+Enter) runs the current code.
- Your code never leaves your browser — Pyodide is a full Python 3.12 interpreter compiled to WebAssembly.
- The standard library is available out of the box:
import collections, heapq, itertools, functools, re, json, math, datetime… - For third-party packages (NumPy, Pandas), call
await micropip.install("pkg")first — most pure-Python and many compiled packages work. - Looking for interview problems? Try the 100 coding questions page — every solution has a "Run" button.