Online Code Formatter

Universal code beautifier for Python, Java, Swift, JavaScript, C#, HTML, and CSS. Clean up messy code instantly.

Clean Code, Instantly

Don't let messy indentation ruin your code review. Beautify your scripts, classes, and markup with our universal formatter. Supports Python, Java, Swift, and more.

Multi-Language Support

Input Code

Formatted Output

How this Online Code Formatter works

This universal code beautification utility transforms messy, minified, or inconsistently formatted source code into clean, readable structures across multiple programming languages including Python, Java, JavaScript, Swift, C#, HTML, and CSS. The tool addresses the common developer problem of inherited legacy code, messy copy-pastes from tutorials, or minified scripts that need debugging but lack readability.

The formatting engine uses a combination of dedicated parsers and intelligent indentation algorithms tailored to each language's syntax. For curly-brace languages like Java, C#, and Swift, it enforces standard brace placement (K&R or Allman styles), ensures consistent indentation depth (configurable to 2 or 4 spaces), and standardizes spacing around operators and keywords. For indentation-sensitive languages like Python, it normalizes existing whitespace structures to ensure execution validity while improving visual hierarchy.

Web languages (HTML/CSS/JS) benefit from specialized rules handling tags, attributes, and property definitions, expanding single-line "minified" inputs into structured, tree-like formats. This processing occurs entirely client-side within the browser, meaning sensitive proprietary code or intellectual property is never transmitted to external servers, ensuring total privacy for developers working on confidential projects.

How to Use

Paste Code

Paste your messy, minified, or unindented code into the editor.

Select Language

Choose the programming language (Python, Java, JS, etc.) to ensure correct syntax handling.

Format

Click the button to instantly beautify your code with proper indentation.

Example Usage

Formatting a minified Java class into a readable structure.

Input

public class Main{public static void main(String[] args){System.out.println("Hello");}}

Output

public class Main { public static void main(String[] args) { System.out.println("Hello"); } }

Frequently Asked Questions

Which languages does this formatter support?

It supports Python, Java, Swift, C#, JavaScript, HTML, and CSS.

Is my code safe?

Yes, 100%. All formatting happens in your browser using JavaScript. No code is sent to any server.

Can it fix syntax errors?

It focuses on formatting (white space, indentation). It will not fix undefined variables or logic errors, but it might highlight where syntax is broken by failing to format correctly.

Related Tools

The Online Code Formatter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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