Python-Fiddle is a quick, shareable Python scratchpad for developers — spin up a throwaway notebook, test an idea, validate a snippet, and share it as a link.
No project to create, no venv to activate. Open the page and run Python in seconds.
Every notebook gets a permanent URL. Share a repro, a snippet, or a demo as a single link.
Hundreds of packages available instantly via Pyodide — no pip, no wheels to download.
Run code cell by cell, inspect output inline, and keep notes alongside your code — great for exploratory work.
Write and run code cell by cell. Inspect output inline, add markdown notes, and build up an analysis or script incrementally.
Open a Notebook →Ask the AI to write boilerplate, explain an error, or suggest a better approach — right inside the notebook.
Try the AI Assistant →Drop a runnable notebook into your documentation, blog post, or README. Readers can run and fork the code without leaving the page.
Test and debug regular expressions with live match highlighting and a quick-reference cheat sheet.
Open Regex Tester →Powered by Pyodide, Python-Fiddle supports hundreds of packages — ready to import with no install step.
Create a minimal reproducible example and share it as a URL — great for Stack Overflow answers, GitHub issues, or explaining something to a colleague.
Drop this in a GitHub issue — anyone can run it immediately
Also supports loading from ?url= query parameter to pull a remote notebook
No sign-up. No config. Just Python in your browser.