Code Formatters - Beautify & Clean Code Online

API Response Formatter

Format and validate API responses instantly. Auto-detect JSON/XML, syntax highlighting, schema validation, mock data generator. Perfect for API testing and debugging.

C# Code Formatter

Format, beautify and validate C# code instantly. Free online C# formatter with syntax highlighting, Microsoft coding standards, and comprehensive error detection.

C++ Code Formatter

Format, beautify and validate C++ code instantly. Free online C++ formatter with syntax highlighting, modern C++ standards, and comprehensive style options.

Code Minifier & Beautifier

Minify or beautify JavaScript, HTML, and CSS code with syntax highlighting and optimization. Essential for web performance and production deployment.

CSS Minifier and Beautifier

Optimize CSS files for faster loading by removing whitespace and comments. Essential for web performance and bandwidth reduction.

Instagram Caption Formatter

Create perfectly formatted Instagram captions with emojis, line breaks, and optimized hashtag placement. Free tool for content creators.

Java Code Formatter

Format, beautify and validate Java code instantly. Free online Java formatter with syntax highlighting, Oracle coding standards, and Spring Framework support.

JavaScript Code Formatter

Format and minify JavaScript code instantly. Free online JS formatter with syntax highlighting, error detection, and beautification options.

JavaScript Minifier & Beautifier

Optimize JavaScript files with advanced compression levels and real-time statistics. Minify for production or beautify for development with TypeScript support.

JSON Formatter

Format and beautify raw JSON code with syntax highlighting, error detection, and collapsible structures. Essential for debugging API responses and data analysis.

JSON Formatter & Validator Pro

Format and validate JSON code with syntax highlighting, error detection, and beautification. Essential for API development and data structure validation.

Kotlin Code Formatter

Format, beautify and validate Kotlin code instantly. Free online Kotlin formatter with syntax highlighting, JetBrains coding standards, and Android development support.

PHP Formatter

Format and beautify PHP code instantly. Free online PHP formatter with syntax highlighting, PSR standards, error detection, and customizable formatting options.

Python Code Formatter

Auto-format Python code to PEP 8 standards. Fix indentation, sort imports, and clean up messy scripts instantly.

Ruby Code Formatter

Format, beautify and validate Ruby code instantly. Free online Ruby formatter with syntax highlighting, Ruby style guide compliance, and Rails framework support.

SQL Beautifier & Validator

Format messy SQL code into clean, readable queries with consistent indentation. Support for multiple SQL dialects and professional database development.

SQL Formatter & Beautifier

Format and beautify SQL queries with syntax highlighting. Professional SQL formatter with support for multiple dialects and customizable formatting options.

SQL Query Builder & Formatter

Build and format SQL queries visually with drag-drop interface. Features syntax highlighting, query optimization tips, and multi-database support.

Swift Code Formatter

Format, beautify and validate Swift code instantly. Free online Swift formatter with syntax highlighting, Apple coding standards, and iOS/macOS development support.

TypeScript Code Formatter

Format, beautify and validate TypeScript code instantly. Free online TypeScript formatter with syntax highlighting, type checking, and modern ESLint-style formatting.

WebSocket Message Formatter & Debugger

Real-time WebSocket message inspection, formatting, and replay. Monitor live connections, analyze frame data, and debug WebSocket communication instantly.

Why use an Online Code Formatter?

Standardizing code syntax improves readability and reduces merge conflicts.

Debug Faster

Receiving minified JSON responses from an API or messy SQL queries from logs? Paste them here to instantly indent and structure the data, making it human-readable for debugging.

Standard Compliance

Our tools adhere to popular style guides:

• Python: PEP8 Standards
• JavaScript: Prettier/Airbnb Style
• SQL: Standard ANSI indentation

Secure & Private

Warning: Many online formatters send your code to their backend. Selqio operates strictly client-side. If you paste an API key or database string, it stays in your RAM, not our logs.

Developer FAQ

Does this support minification?

Yes. Most of our formatters (like CSS, JSON, and JS) act as a toggle. You can choose to "Beautify" (expand) or "Minify" (compress) your code for production.

Can I format partial code snippets?

Absolutely. You don't need a full file. Just paste the function, class, or array you are working on, and our engine will handle the indentation logic.

Is it safe to paste proprietary code?

Yes, on Selqio it is. Unlike server-based tools, we use JavaScript libraries to process text in your browser. We have zero visibility into what you paste.

Clean Code, Instantly.

Supported Languages