Can I customize the formatting style?

Yes. You can customize indentation size (2, 4, or 8 spaces or tabs), semicolon style (always, never, or auto), quote style (single, double, or auto), trailing commas, arrow function parentheses, and maximum line length.

Can I format a code file from my computer?

Yes. Click the "Upload File" button to load a source file from your device. The formatter auto-detects the programming language from the file extension (e.g. .js, .py, .html) and formats the file contents instantly.

Can the formatter expand and reformat minified code?

Yes. Paste or upload minified code and the formatter will add proper indentation and line breaks to make it readable. Structurally obfuscated code will also be formatted, though renamed variables will remain unchanged.

What is the difference between code formatting and code minification?

Formatting (beautifying) adds indentation, spacing, and line breaks to make code human-readable. Minification removes whitespace to reduce file size for production. Use this tool to format, or use the Code Minifier tool to minify.

Is registration or sign-up required to use the code formatter?

No. The code formatter is completely free with no account, sign-up, or payment required. Just open the tool and start formatting code instantly.

Code Formatter & Beautifier Online Free | JS, Python, HTML, CSS

Formatting Options

Language

Indent Size

Indent Type

Trim whitespace

Final newline

Real-time formatting

Advanced Settings

Max Line Length

Bracket Style

Quote Style

Semicolon Style

Trailing Comma

Arrow Parens

Quick Examples & File Upload

Upload Code File

Max 1MB • Auto-detects language

Quick Examples

Input Code

7 lines, 183 chars

Formatted Code

-- lines, -- chars

Formatted code will appear here...

Keyboard Shortcuts

Ctrl+EnterFormat Code

Ctrl+Shift+CCopy Output

Ctrl+SDownload

Ctrl+KClear Input

Why Use a Code Formatter?

Clean, consistently formatted code is easier to read, review, and maintain. Our browser-based formatter instantly beautifies messy or minified code across 20+ languages with zero configuration — no signup, no server upload, completely private.

Why Choose Our Code Formatter?

✓Support for 20+ programming languages
✓Customizable indentation, semicolons, and quote style
✓Real-time formatting with live preview
✓100% browser-based — no signup, no upload, fully private

Perfect For Multiple Use Cases

💻Web development and frontend coding
🔧Backend development and API coding
📱Mobile app development
📝Code review and documentation

20+ Programming Languages: JavaScript, Python, Java, HTML & More

Format code in all major programming languages — from web technologies like JavaScript and HTML to systems languages like C++ and Rust, to data formats like SQL, JSON, and XML.

Web Technologies

• JavaScript (ES6+)
• TypeScript
• HTML5
• CSS3
• JSON

Systems & General Purpose

• Python 3
• Java
• C++
• C#
• Go
• Rust

Mobile & Scripting

• Swift
• Kotlin
• Scala
• PHP
• Ruby

Data & Config

• SQL
• XML
• YAML
• Markdown

How Our Code Formatter Works

Our formatter uses advanced parsing algorithms to intelligently format and beautify code while maintaining language-specific syntax rules.

Select Language

Choose from 20+ languages — or upload a file for auto-detection from the file extension.

Paste or Upload Code

Paste your code directly into the input panel or upload a source file from your computer.

Configure Options

Set indent size, spaces vs tabs, semicolons, quote style, and max line length in Advanced Settings.

Format the Code

Click "Format Code" — the formatted output appears instantly with a line and character count comparison.

Copy or Download

Copy the formatted code to clipboard or download it as a text file. Your original is never modified.

Examples & Common Use Cases

Discover how our code formatter can help you in various development scenarios with real examples.

JavaScript Code Formatting

Input (Unformatted):

function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
}

const numbers = [1,2,3,4,5];
const doubled = numbers.map(n => n * 2);
console.log(doubled);

Output (Formatted):

function fibonacci(n) {
  if (n <= 1) return n;
  return fibonacci(n - 1) + fibonacci(n - 2);
}

const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(n => n * 2);
console.log(doubled);

Python Code Formatting

Input (Unformatted):

def fibonacci(n):
if n <= 1:
return n
return fibonacci(n - 1) + fibonacci(n - 2)

numbers = [1, 2, 3, 4, 5]
doubled = [n * 2 for n in numbers]
print(doubled)

Output (Formatted):

def fibonacci(n):
    if n <= 1:
        return n
    return fibonacci(n - 1) + fibonacci(n - 2)


numbers = [1, 2, 3, 4, 5]
doubled = [n * 2 for n in numbers]
print(doubled)

Benefits for Developers

Explore how our tool integrates into modern development workflows and improves code quality.

Development Workflow

Code Review:

Format code before submitting for review to ensure consistent style and readability

Team Collaboration:

Maintain consistent coding standards across team members and projects

Documentation:

Format code examples in documentation for better readability and understanding

Code Quality & Maintenance

Readability:

Improve code readability with proper indentation, spacing, and structure

Maintainability:

Make code easier to maintain and modify with consistent formatting

Debugging:

Easier debugging with clear code structure and visual organization

Frequently Asked Questions About Our Code Formatter

Common questions about formatting and beautifying code online with our free tool.

What programming languages are supported?

Our formatter supports 20+ programming languages including JavaScript, TypeScript, Python, Java, C++, C#, PHP, Ruby, Go, Rust, Swift, Kotlin, HTML, CSS, SQL, JSON, XML, YAML, Markdown, and Scala. Select from the language dropdown to apply language-specific indentation rules and conventions.

Can I customize the formatting options?

Yes! You can customize indentation size (2, 4, or 8 spaces), choose between spaces and tabs, set semicolons to always/never, control quote style (single or double), and configure trailing whitespace and final newline preferences to match your team's coding standards.

How does the language detection work?

When you upload a file, the formatter automatically detects the language from the file extension (e.g. .js, .py, .html). For pasted code, you can manually select the language from the dropdown for optimal formatting results.

Is my code secure and private?

Absolutely. All formatting is performed locally in your browser using client-side JavaScript. No code is ever transmitted to our servers, stored in a database, or logged in any way. Your source code stays 100% private on your device.

Does the code formatter work offline?

Yes! Once the page has loaded in your browser, the formatter works entirely offline. All formatting logic runs client-side, so no internet connection is needed after the initial page load. Ideal for environments with restricted network access.

What is the difference between formatting and minifying code?

Formatting (beautifying) adds proper indentation, consistent spacing, and line breaks to make code readable for humans. Minifying does the opposite — it strips whitespace and shortens identifiers to reduce file size for production deployment. Use our Code Minifier tool when you need to minify.

Can I format minified or obfuscated code?

Yes, our formatter can expand and reformat minified code by adding proper indentation and line breaks. Structurally obfuscated code will also be formatted, though obfuscated variable and function names will remain unchanged since the formatter only adjusts whitespace and structure.

How do I format a code file from my computer?

Click the "Upload File" button (or drag-and-drop a file) in the input panel. The formatter accepts source files of any size in all 20+ supported languages. The language is auto-detected from the file extension and the formatted result can be copied or downloaded as a text file.

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Formatting Options

Advanced Settings

Quick Examples & File Upload

Quick Examples

Input Code

Formatted Code

Keyboard Shortcuts

Popular Use Cases

Why Use a Code Formatter?

Why Choose Our Code Formatter?

Perfect For Multiple Use Cases

20+ Programming Languages: JavaScript, Python, Java, HTML & More

Web Technologies

Systems & General Purpose

Mobile & Scripting

Data & Config

How Our Code Formatter Works

Select Language

Paste or Upload Code

Configure Options

Format the Code

Copy or Download

Examples & Common Use Cases

JavaScript Code Formatting

Python Code Formatting

Benefits for Developers

Development Workflow

Code Quality & Maintenance

Frequently Asked Questions About Our Code Formatter

What programming languages are supported?

Can I customize the formatting options?

How does the language detection work?

Is my code secure and private?

Does the code formatter work offline?

What is the difference between formatting and minifying code?

Can I format minified or obfuscated code?

How do I format a code file from my computer?

Related Development Tools & Utilities

JSON Formatter

Code Minifier

Text Diff

Regex Tester

HTML Entity Encoder

XML to JSON Converter

Related Articles

How to Format JSON Online Free

JSON Formatter vs Prettier: Which Should You Use?

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Formatting Options

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Quick Examples

Input Code

Formatted Code

Keyboard Shortcuts

Popular Use Cases

Why Use a Code Formatter?

Why Choose Our Code Formatter?

Perfect For Multiple Use Cases

20+ Programming Languages: JavaScript, Python, Java, HTML & More

Web Technologies

Systems & General Purpose

Mobile & Scripting

Data & Config

How Our Code Formatter Works

Select Language