Python Beautifier: Format Python Code in Your Browser
Python Beautifier is an in-browser Python code formatter powered by Ruff compiled to WebAssembly. Paste or drop Python source, then set indentation, line length, and quote style to produce consistently formatted output. Ruff is a fast, Black-compatible formatter used by modern Python projects. The tool also helps identify input that does not parse and runs in your browser.
Python Beautifier is a browser-based Python code formatter that uses Ruff compiled to WebAssembly. It applies formatting to Python source and provides configurable indentation, line length, and quote style. Ruff is a fast, Black-compatible formatter used by modern Python projects, making this tool useful when you want formatted Python without setting up a local formatter.
To use it, paste or drop your Python code, choose the available formatting options, and copy the resulting output. Indentation, line length, and quote style affect how the code is presented. The tool can also help confirm whether the input parses cleanly and identify the line where it does not.
Python is a programming language in which indentation is significant to code structure, so consistent formatting can make code easier to scan and review. A Python beautifier helps prepare machine-generated files, unfamiliar code, or short snippets for commits, diffs, bug reports, and code reviews. Formatting Python before sharing it can also reduce visual noise caused by inconsistent whitespace.
Python Beautifier runs entirely in your browser, and your input is processed on your own device rather than sent to a server. Nothing is uploaded, stored, or sent elsewhere. Because it has no server dependency, it works offline once the page has loaded, so you can format Python without an active connection.
This free tool is intended for developers and DevOps engineers who want a convenient way to format Python in the browser. It can help when you need a quick formatting pass, want to check code you did not write, or need consistently styled output for review.
Step 1: Paste or drop your Python code into the input area. The tool accepts Python source for formatting.
Step 2: Choose the indentation, line length, and quote style you want. These options let you adjust the formatted output to your needs.
Step 3: Run the formatter to apply Ruff's formatting to your Python code. If the input does not parse, the tool can help you find the line where the problem occurs.
Step 4: Copy the formatted output for your project, code review, or bug report.
Use case: Make an unreadable, machine-generated Python file easier to review before you commit it.
Use case: Check Python code you did not write against the formatting requirements you need to follow.
Use case: Produce consistently indented output so a diff highlights code changes instead of whitespace noise.
Use case: Format a snippet before including it in a bug report or code review.
Use case: Check whether Python input parses cleanly and find the line where it does not.
Use case: Apply a consistent format to Python snippets shared across a team, adjusting indentation, line length, and quote style as needed.
Use case: Tidy Python code before sharing it with other developers, making the formatted version easier to read.