Python Formatter — Fix Indentation & Clean Python Code

How to use

1. 1 Paste Python source code.
2. 2 Pick indent size (2 or 4 spaces) and optional quote normalization.
3. 3 Tune the maximum number of blank lines between blocks.
4. 4 Copy or download the result.

Why use this tool

• Pure client-side — your code never leaves the browser.
• No 50 KB Black-wasm download — instant load.
• Re-emits indents at the size you choose, even when the source mixes tabs and spaces.
• Optional quote-style normalization that respects triple-quoted strings.

Frequently asked questions

What is Python Formatter?

A Python Formatter is a tool that tidies Python source code in the browser by cleaning indentation, collapsing extra blank lines, and normalizing string quotes. It works as an indentation cleaner rather than a full PEP-8 formatter, applying consistent spacing to make code more readable without uploading the source to a server.

Features

Example

def fib(n):
  if n < 2:
    return n

def fib(n):
    if n < 2:
        return n

Common use cases

1. 1

   Fix pasted code indentation

   Clean up Python copied from a PDF, email, or chat where indentation broke.

2. 2

   Quick readability pass

   Tidy a snippet before sharing, without installing Black locally.

3. 3

   Normalize blank lines

   Collapse excessive blank lines in a hand-edited script.

References

• PEP 8 — Style Guide for Python Code — Python
• The Python Language Reference — Lexical analysis — Python

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