Code Formatter
Format and beautify code in multiple languages with Prettier
Formatting Options
Input Code
Formatted Output
Format and beautify code in JavaScript, TypeScript, HTML, CSS, JSON, Markdown, and more using Prettier-compatible formatting rules. Enforce consistent code style instantly without installing anything — just paste your code and get professionally formatted output.
Automated Code Formatting for Consistent, Readable Software Projects
Consistent code style is one of the most effective, lowest-effort improvements a software team can make to their codebase's long-term maintainability. When every developer formats code differently — different indentation sizes, different brace styles, different line length limits, different quote styles — code reviews become cluttered with style comments, git history becomes noisy with reformatting commits, and new team members face a cognitive overhead of parsing multiple styles as they navigate the codebase.
Automated code formatters solve this entirely. Tools like Prettier have a deliberate philosophy: rather than offering extensive configuration options that lead to endless debates, they provide an opinionated default style with minimal options, and they format consistently and deterministically every time. Once adopted, formatting stops being a topic of discussion entirely — the tool decides, and everyone benefits from the mental bandwidth freed up for actual design and logic discussions.
This online code formatter applies Prettier-compatible formatting rules for 10+ languages. JavaScript and TypeScript files get semicolons, consistent quote style, and trailing commas. HTML gets correct attribute quoting and self-closing tags. CSS and SCSS get properties sorted and indented consistently. JSON gets standardized 2-space indentation. Markdown gets consistent heading styles and list formatting. All processing happens in the browser with no installation required.
Formatting Code Snippets for Documentation
Ensure code examples in README files, blog posts, API documentation, and Stack Overflow answers are consistently formatted and professional before publishing them.
Quick Formatting Without IDE Setup
Format code on a machine where your IDE extensions aren't installed — when working on a server, in a browser-based environment, or reviewing code from a colleague's paste.
Converting Tab-Indented Code to Space Indentation
Normalize indentation in code copied from various sources that mix tabs and spaces, eliminating mixed-indentation warnings and ensuring consistent style throughout the file.
Formatting Configuration Files for Readability
Clean up package.json, tsconfig.json, .eslintrc, Prettier config, and other JSON/YAML configuration files to ensure consistent, readable structure before committing.
- 1
Paste Your Code into the Editor
Click the input panel and paste your code, or type directly. The editor provides syntax highlighting for the detected language to make the content easier to read before formatting.
- 2
Select the Programming Language
Choose the language from the selector to ensure the correct formatting rules are applied. The tool auto-detects common languages based on syntax patterns, but explicit selection overrides auto-detection.
- 3
Adjust Indentation and Style Options
Configure indentation width (2 or 4 spaces, or tab), print width (line length limit before wrapping), quote style (single or double), and whether to include semicolons — matching your project's Prettier configuration.
- 4
Copy or Download the Formatted Code
After formatting, click 'Copy' to transfer the output to your clipboard, or 'Download' to save it as a file with the appropriate extension. A diff view shows exactly what changed.
Prettier-Compatible Multi-Language Formatting
Applies the same formatting rules as the Prettier library for JavaScript, TypeScript, JSX, TSX, CSS, SCSS, HTML, JSON, YAML, Markdown, and GraphQL — ensuring your online formatting matches your IDE's Prettier output.
Configurable Style Options
Adjust print width, tab width, quote style, semicolons, trailing commas, and bracket spacing to match your project's `.prettierrc` configuration, so formatted output integrates seamlessly into your codebase.
Syntax Error Detection Before Formatting
If the code has a syntax error that prevents parsing, the formatter reports the error with line and column information rather than silently producing malformed output.
Diff View to Review Formatting Changes
The side-by-side diff view highlights exactly which lines changed, making it easy to review what the formatter modified and decide whether to accept all changes or make specific adjustments.
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