Python Formatter Online
Format and beautify Python code instantly in your browser. Normalizes indentation to PEP 8 style — 4 spaces per level. Free, no install, runs entirely client-side.
Python Input
Formatted Output
What Is a Python Formatter?
A Python formatter is a tool that automatically restructures your Python code to follow a consistent, readable style. It fixes indentation, removes unnecessary trailing spaces, and enforces blank-line rules between functions and classes — all following the PEP 8 style guide, the widely accepted standard for Python code style.
This online Python formatter works entirely in your browser. No code is sent to any server — your source code stays private on your machine. Paste your code, click format, and get clean, PEP 8-compliant output in seconds.
How to Use the Python Formatter
Paste or upload your Python code
Paste your Python code into the left editor panel, or click Upload to load a .py or .txt file from your device. You can also click Sample to load an example.
Formatting happens automatically
The formatter runs as you type — it normalizes indentation to 4 spaces, removes trailing whitespace, and adds the correct blank lines between top-level definitions according to PEP 8.
Copy or download the result
Click Copy to copy the formatted code to your clipboard, or click Download to save it as a .py file.
Formatting Examples
Before and After Formatting
Before formatting:
After formatting:
Frequently Asked Questions
Does this formatter follow PEP 8?
Yes — the formatter applies the core structural rules from PEP 8: 4-space indentation, two blank lines before top-level function and class definitions, single blank lines between methods, and no trailing whitespace. It does not enforce line-length limits or import ordering.
Can I use it for large Python files?
Yes. The formatter runs entirely in your browser using JavaScript, so it can handle typical Python files of a few hundred to a few thousand lines with no delay. Very large files (tens of thousands of lines) may take a moment but will still process correctly.
Does it handle decorators and type hints?
Yes. Decorators (lines starting with @) are treated as part of the function or class they belong to — the blank lines are placed before the decorator, not between the decorator and the definition. Type hints in function signatures are preserved as-is.
Is my code sent to a server?
No. All formatting is done locally in your browser with JavaScript. Your code never leaves your device. There are no accounts, no upload limits, and no logging.
Why aren't import statements reordered?
Import reordering (grouping standard library, third-party, and local imports) is a feature of tools like isort. This formatter focuses on structural formatting — indentation, blank lines, and whitespace — to keep behavior predictable and avoid unintended changes to your code.
Related Tools
Learn more about Python style and formatting from these authoritative resources: PEP 8 — Style Guide for Python Code (the official Python style standard), Python 3 Official Documentation, Black — The Uncompromising Python Formatter (a popular opinionated formatter), autopep8 on PyPI (automatically formats Python code to conform to PEP 8), Real Python: How to Write Beautiful Python Code With PEP 8, and MDN Web Docs: Python Glossary.