Python Formatter

Python Formatter & Beautifier

What does the Python formatter do?

This tool normalizes Python code indentation, trims trailing whitespace on each line, removes excessive blank lines, and ensures the file ends with a single newline — matching the most common Python style conventions from PEP 8 and tools like Black.

When should I use a Python formatter?

Use it when pasting code from Stack Overflow or AI tools that may have inconsistent indentation, when converting between tab-indented and space-indented files, when reviewing code that mixes different indentation styles, or when preparing code snippets for documentation or blog posts.

Input and output example

Given messy mixed-indentation input:

def hello():
  if True:
      print("hi")   

The formatter normalizes to consistent 4-space indentation with no trailing whitespace:

def hello():
    if True:
        print("hi")

Limitations of browser-based Python formatting

A full Python formatter like Black requires a complete parser to safely reformat code. This browser-based tool performs whitespace normalization only: indentation re-indentation, blank line capping, and trailing whitespace removal. It does not reorder imports, wrap long lines, add or remove parentheses, or enforce any other PEP 8 rules beyond indentation. For production use, run Black or Ruff in your CI pipeline.