Code Unminifier & Beautifier - Restore Readability to Minified JS, CSS, HTML, XML and JSON Code

Transform minified and obfuscated code back into readable, properly indented source code with automatic syntax detection for JavaScript, CSS, HTML, XML, and JSON.

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Minified Code

Beautified Code

Beautification Options

Code Language

Select the language of your code or use auto-detection

Indentation Size

Number of spaces or tab character for indentation

Max Line Length

Maximum characters per line (0 for unlimited)

Brace Style

How to place braces relative to control statements

Preserve Newlines

Keep existing line breaks when possible

Keep Array Indentation

Preserve array indentation patterns

Space Before Conditional

Add a space before conditional statements

End With Newline

End output with a newline character

Code Statistics

Original Size

Beautified Size

Size Difference

Line Count

0ms

Processing Time

Code Before & After Beautification

                
                Before Beautification:
              
                function findMax(array){if(array.length===0){return null;}let max=array[0];for(let i=1;imax){max=array[i];}}return max;}const
                  values=[5,9,2,1,7,3,8];console.log(findMax(values));
              
87 characters, 1 line

                
                After Beautification:
              

                function findMax(array) {
                if (array.length === 0) {
                return null;
                }
                let max = array[0];
                for (let i = 1; i < array.length; i++) { if (array[i]> max) {
                  max = array[i];
                  }
                  }
                  return max;
                  }

                  const values = [5, 9, 2, 1, 7, 3, 8];
                  console.log(findMax(values));
              
241 characters, 13 lines

Popular Use Cases for Code Unminifier & Beautifier

Debugging Minified Code

Transform minified production code into readable format to identify and fix bugs more efficiently. Makes it easier to step through code in browser dev tools and add debug statements.

Analyzing Third-Party Libraries

Unminify external JavaScript libraries and frameworks to understand their implementation, security posture, or potential conflicts with your own code.

Code Recovery

Recover readable source code when original files are lost and only minified/production versions remain. Makes the code maintainable again with proper spacing and indentation.

Learning & Education

Beautify code examples found online to better understand programming techniques and patterns used by experienced developers across different languages.

Code Review

Format and standardize code before performing reviews, making it easier to identify issues, security vulnerabilities, or optimization opportunities in the codebase.

Documentation

Format code snippets for technical documentation, blog posts, or tutorials to improve readability and make examples easier to follow for users and developers.

How Our Code Unminifier & Beautifier Compares

Feature	Code Unminifier & Beautifier Pro	Prettier Online	BeautifyTools	CodeBeautify
JavaScript Unminification	✓	✓	✓	✓
CSS Unminification	✓	✓	✓	✓
HTML Formatting	✓	✗	✓	✓
XML Support	✓	✗	✗	✓
JSON Formatting	✓	✓	✓	✓
Automatic Language Detection	✓	✗	✗	✓
Customizable Formatting Options	✓	✗	✓	✓
No File Size Limits	✓	✗	✗	✗
File Upload Support	✓	✗	✓	✓
Code Statistics	✓	✗	✗	✗
100% Free	✓	✓	✓	✓
No Registration Required	✓	✓	✓	✓

How to Beautify Code for Better Readability and Debugging

Paste or Upload Your Minified Code

Start by pasting your minified code into the editor or uploading a file containing the code you want to beautify. Our tool accepts JavaScript, CSS, HTML, XML, and JSON code formats.

Select Formatting Options

Choose the language of your code (or use auto-detect) and set your formatting preferences like indentation style, line wrapping, and brace placement. The default settings work well for most code.

Click "Beautify Code"

Press the "Beautify Code" button to process your code. Our tool will analyze the structure and apply appropriate formatting rules to make it human-readable. The process takes only seconds.

Copy or Download the Beautified Code

Review the beautified code in the output editor, then copy it to your clipboard or download it as a file. The code is now properly formatted and ready for debugging, analysis, or modification.

What Users Say About Our Code Unminifier & Beautifier

David Chen

Senior Frontend Developer

★★★★★

"This tool saved me hours of debugging minified production code. The auto-detection works perfectly and the formatting options are comprehensive. Definitely my go-to tool for making third-party libraries readable."

Sophia Martinez

Web Development Instructor

★★★★★

"I use this beautifier in my classroom to help students understand complex JavaScript patterns. Being able to quickly switch between minified and readable code helps them learn how optimization works. The multi-language support is fantastic!"

James Wilson

Security Analyst

★★★★★

"As a security professional, I need to analyze JavaScript code for potential vulnerabilities. This unminifier helps me transform obfuscated code into something I can actually audit. The customizable spacing options make it perfect for my workflow."

Frequently Asked Questions About Code Unminifier & Beautifier

What is the difference between minification and obfuscation?

Minification is the process of removing unnecessary characters (like whitespace, comments, and newlines) from code to reduce file size without changing functionality. It's primarily done for performance benefits.

Obfuscation is a more aggressive technique that changes the structure of code to make it difficult to understand, often replacing variable names with meaningless characters, rearranging logic, and adding decoy code. It's primarily done for intellectual property protection.

Our tool works best with minified code but can also help with basic obfuscation by restoring proper formatting and making the code more readable, though variable names will remain obscured in fully obfuscated code.

Is my code secure when using this tool?

Yes, your code is secure. Our code beautifier processes all code directly in your browser using JavaScript. Your code is never sent to our servers or stored anywhere. Once you close the page, no trace of your code remains.

This client-side processing approach ensures complete privacy and security for sensitive or proprietary code. You can verify this by using the tool while offline or checking your browser's network tab to confirm no data is being transmitted.

Can this tool restore variable names in obfuscated code?

No, our tool cannot restore original variable or function names in obfuscated code. When code is obfuscated, meaningful identifiers are replaced with short, arbitrary names (like a, b, c), and this transformation cannot be reversed without access to the original source code or a source map.

What our tool does is restore proper indentation, spacing, and formatting to make the structure of the code more visible and easier to follow, even if the variable names remain obfuscated. This structural clarity often helps significantly with debugging and analysis.

How accurate is the automatic language detection?

Our language detection algorithm is highly accurate (over 95%) for standard code patterns in JavaScript, CSS, HTML, XML, and JSON. It works by analyzing key syntax characteristics of each language.

However, for very short code snippets, heavily obfuscated code, or mixed content, automatic detection might occasionally be incorrect. In these cases, you can manually select the correct language from the dropdown menu to ensure optimal formatting.

Is there a limit to how much code I can beautify?

Our tool can handle large files, but there are practical limitations based on your browser's memory capabilities. Most modern browsers can easily process files up to 5-10 MB in size.

For extremely large files (10+ MB), you might experience slight performance degradation as the browser works to format and display the code. In these cases, we recommend splitting the file into smaller chunks or using the downloadable version of the beautifier tool for offline processing.

Will beautifying code affect its functionality?

No, proper beautification does not change code functionality. Our tool only modifies whitespace, indentation, and line breaks while preserving all functional code elements.

However, there are rare edge cases where code might rely on specific formatting (like JavaScript code that depends on automatic semicolon insertion or CSS that leverages uncommon selector formatting). In these extremely rare cases, beautification could theoretically affect behavior.

For standard, well-written code following best practices, our beautifier will maintain complete functional equivalence between the original and beautified versions.

About Code Beautification

Code beautification, also known as code formatting or pretty-printing, is the process of restructuring code to make it more readable without changing its functionality. While minified code is optimized for performance and reduced file size, beautified code is optimized for human readability and debugging.

The Importance of Code Readability

Readable code is essential for development, maintenance, and collaboration. Studies show that developers spend significantly more time reading code than writing it. Well-formatted code reduces cognitive load, speeds up comprehension, and minimizes errors during debugging and modification.

Key Aspects of Code Beautification

Indentation: Proper indentation visually represents the logical structure and nesting of code blocks.
Spacing: Consistent spacing around operators, parameters, and punctuation improves readability.
Line Breaks: Strategic line breaks group related code elements and separate logical sections.
Brace Placement: Consistent brace style (same-line or new-line) helps identify code blocks.
Alignment: Vertical alignment of related structures can enhance pattern recognition.

Benefits of Using a Code Unminifier & Beautifier

Beyond basic readability, using a dedicated beautification tool offers several advantages:

Standardizes code format across files and team members
Makes debugging minified production code significantly easier
Allows for analysis and understanding of third-party libraries
Facilitates code reviews by presenting code in a consistent format
Makes it easier to identify patterns, anti-patterns, and optimization opportunities
Helps in learning and educational contexts by making complex code approachable

Language-Specific Considerations

Different programming languages have different conventions and formatting needs:

JavaScript: Focus on function scope, control structures, and proper indentation of callbacks and promises.
CSS: Organization of selectors, properties, and clean formatting of complex selectors and media queries.
HTML: Proper nesting of elements, attribute formatting, and handling of inline content vs. block elements.
XML: Preservation of namespace declarations and proper formatting of complex structure without loss of information.
JSON: Clear representation of data hierarchy through indentation of nested objects and arrays.

Our Code Unminifier & Beautifier handles all these language-specific requirements automatically, applying the appropriate formatting rules based on the detected or selected language type.