Python Formatter - Fix Indentation & Beautify Code Online

Beautify and Fix Messy Python Code

This Python formatter re-indents blocks and cleans up whitespace in your source code the moment you paste it — entirely in your browser. Drop in code with broken indentation, mixed tabs and spaces, or cramped nesting, and a consistent, readable version appears instantly in the right-hand panel.

It is an indent-and-whitespace cleaner, not an aggressive rewriter — your code keeps its original logic and layout while becoming consistent and easy to read.

Common Use Cases

Fix Indentation

Normalize inconsistent or mixed indentation — a frequent cause of IndentationError and TabError in Python.

Clean Up Whitespace

Strip trailing spaces and tidy code pasted from emails, PDFs, chat, or notebook cells.

Review & Learn

Make tutorial snippets or generated code readable before running or studying them.

How to Format Python Code

1

Paste Your Code

Type or paste Python into the Input panel on the left. You can also Upload a .py file or click Sample to load an example.

2

See Instant Output

The formatted, syntax-highlighted result appears automatically in the right panel as you type. Line numbers and a live size counter make larger files easy to scan.

3

Set the Indent Width

Choose the indent — 4 spaces follows the PEP 8 convention, while 2, 3, 8, or Tab are available if your project differs. The output re-formats immediately.

4

Copy or Download

Click Copy to grab the result, or Download to save it as a .py file. Switch to Edit mode to tweak the output by hand first.

Everything runs locally. Your code is formatted entirely in the browser and is never uploaded to any server.

Python Formatting Features

What Gets Cleaned Up

Consistent Indentation

Re-indents nested blocks to your chosen width and replaces mixed tabs and spaces with a single style.

Whitespace Cleanup

Removes trailing whitespace and ensures the file ends with a single trailing newline.

This is an indentation and whitespace cleaner, not a full PEP 8 reformatter. For opinionated reformatting — line wrapping, quote normalization, or import sorting — use a dedicated tool such as Black or autopep8 in your local environment.

The Indent Option

Option	Choices	What It Controls
Indent	2 · 3 · 4 · 8 spaces · Tab	Indentation width per nesting level. 4 spaces is the PEP 8 default.

Built-In Tools

Real-Time Formatting

Output updates as you type, with Prism syntax highlighting and line numbers on both panels.

Upload & Download

Load a local .py file or export the formatted result as formatted.py with one click.

Editable Output

Toggle the result panel to CodeMirror edit mode to make manual tweaks before copying.

New to the tool? Click Sample to load a snippet with messy indentation and watch it clean up instantly.

Python Formatter FAQ

Is my Python code sent to a server?

No. All formatting happens locally in your browser. Your code is never uploaded, logged, or stored, so it is safe to use with proprietary or confidential Python.

Does it follow PEP 8?

It applies PEP 8's recommended 4-space indentation by default and cleans up whitespace, but it is not a complete PEP 8 enforcer. For full style compliance — including line length and import ordering — pair it with a linter such as Flake8 or a formatter like Black.

Can it fix mixed tabs and spaces?

Yes. Mixing tabs and spaces is a common cause of IndentationError and TabError. The formatter normalizes everything to a single, consistent indent style based on the width you choose.

Will it rewrite or refactor my code?

No. The tool focuses on indentation and whitespace. It does not split long lines, change quotes, reorder imports, or alter your logic — the code keeps its original structure.

Can I use Tab indentation instead of spaces?

Yes. Select Tab in the indent options if your project uses tabs. PEP 8 recommends spaces, but the tool respects whichever style you pick.

Why does my output look different from Black?

Black is an opinionated reformatter that rewrites code extensively, while this tool only cleans indentation and whitespace. The two have different goals, so the results will not match — use this for quick cleanup and Black for full reformatting.