Free Online Python Formatter

The Python formatter normalises indentation (tabs to spaces) and tidies blank lines around block boundaries — a fast cleanup pass for pasted code.

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Normalises indentation only. For full PEP 8 compliance, run Black or autopep8.

How to Use This Developer Tool

  1. Paste your Python into the input area.
  2. Pick an indent size (PEP 8 says 4).
  3. Read the cleaned-up code in the output panel.
  4. Click Copy to send the result to your clipboard.

What Is a Python Formatter?

Black and autopep8 are the standards for PEP 8 compliance in a real codebase — they reflow lines, normalise quote style, and produce deterministic output. This formatter does the smaller job: detect the input's indentation level, re-emit it as consistent spaces, and tidy blank lines around `def`, `class`, and decorators.

It's most useful when you've pasted Python from a notebook export, a chat client that mangled whitespace, or an email that turned tabs into something else — places that destroy indentation. For codebases that need PEP 8 enforcement, run Black in pre-commit; for one-off inspection in a browser tab, this is faster than spinning up a toolchain.

Frequently Asked Questions

Is this Black?
No. This is a lightweight in-browser formatter that normalises indentation and spacing. For deterministic PEP 8 output, run Black or autopep8 as part of your toolchain.
Does it work with Python 3?
Yes, modern Python 3 syntax including f-strings and type hints is preserved verbatim.
Can it fix indentation?
It normalises tab and mixed indentation to spaces and adjusts blank lines around block boundaries.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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