Online Python Compiler

• Real input()

  When your program asks a question, type the answer right in the output and press Enter, just like a terminal.

• Errors in plain English

  Tracebacks are trimmed to your code, the line is highlighted, and common mistakes come with a hint.

• Works on phones

  Code, Input and Output tabs, a thumb-reach Run button, and no zoom-in when you type on iPhone or Android.

• numpy, pandas and more

  Import a package and it loads automatically. 357 packages are available, including numpy, pandas, scipy and sympy.

• Autosave

  Your code is saved in this browser as you type. Come back later and it is still there.

• Open and download .py files

  Load a .py file (up to 200 KB) from your computer, or download your program as main.py.

• Safe by default

  A Stop button, a 15-second limit and an output cap mean an infinite loop can't freeze the page.

• A friendly editor

  Syntax colours, Tab for 4 spaces, auto-indent after a colon, and Ctrl/⌘ + Enter to run.

1. 1

   Write your code. Type Python in the main.py editor, or pick one of the ready examples from the Examples menu.

2. 2

   Press Run. Click Run, or press Ctrl + Enter (⌘ + Enter on Mac). The first run downloads Python once; later runs start instantly.

3. 3

   Answer input(). If your program calls input(), type your answer where the cursor blinks in the output and press Enter.

4. 4

   Fix errors. If something breaks, read the hint and click the line number to jump straight to the mistake.

5. 5

   Save your work. Your code autosaves in the browser. Use Download to keep a copy as main.py.

Most online compilers squeeze a desktop layout onto a phone. Here the same compiler switches to three tabs: Code, Input and Output. Pressing Run jumps to the output, and tapping an error line takes you back to the code.

It runs in Chrome on Android and Safari on iPhone and iPad, with nothing to install. Text is 16 px on phones so the browser doesn't zoom in when you type.

Many browser compilers make you type every answer into a box before you press Run. On modern browsers this compiler pauses your program at input() and waits for you to type, so quizzes, games and calculators work the way they do on a laptop.

On older browsers that can't pause, an Input box appears instead: write one answer per line, in order, and they are fed to input() as your program runs.

Both, in a way. CPython first compiles your code into bytecode, then its interpreter runs that bytecode. "Online Python compiler" is simply the name most people search for. What runs here is the standard CPython 3.14 interpreter, compiled to WebAssembly so the browser can run it.

These are in the Examples menu at the top of the compiler. Pick one and press Run.

name = input("What is your name? ")
age = int(input("How old are you? "))
print(f"Hi {name}! Next year you will be {age + 1}.")

n = 7
for i in range(1, 11):
    print(f"{n} x {i:>2} = {n * i}")

def average(numbers):
    return sum(numbers) / len(numbers)

scores = [78, 92, 85, 64, 99]
print("Scores:", scores)
print("Highest:", max(scores))
print("Average:", round(average(scores), 1))

• Windows and graphics libraries such as tkinter and turtle don't work in a browser.
• matplotlib imports, but plots are not displayed yet.
• Only packages built for Pyodide can be imported; pip install isn't available.
• Each run stops after 15 seconds.
• Code is saved in this browser only, so it won't follow you to another device.

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• Is Python Compiled or Interpreted? A Clear Answer

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