Online Code Beautifier
Professional code formatting tool with real-time preview, custom settings, and team collaboration support
Online Code Beautifier - Free JavaScript TypeScript HTML CSS Formatter
Format JavaScript, TypeScript, HTML, CSS, and JSON instantly in your browser. No installation required.
Input code
Paste or type code to beautify
Beautified code
Format your code to view the result here
Features
Everything you need for professional code formatting
Core Formatting Capabilities
Multi-Language Support
Format JavaScript (ES5/ES6+, JSX), TypeScript (TSX), HTML, CSS, and JSON
Real-Time Preview
See formatting changes instantly as you type with live preview
Syntax Highlighting
Advanced code highlighting for better readability
Custom Settings
Configure indentation, semicolons, quotes, line width, and more
Batch Processing
Upload and format multiple files simultaneously
Team Collaboration
Configuration Export/Import
Share formatting rules across your team
Preset Rules
Choose from Standard, Airbnb, Google style guides
CI/CD Integration
Export configurations for GitHub Actions and other pipelines
Consistent Code Style
Enforce uniform formatting standards organization-wide
User Experience
Browser-Based
No installation required - works entirely in your browser
Drag & Drop
Simple file upload via drag-and-drop interface
Keyboard Shortcuts
Fast formatting with Ctrl+Alt+F and other shortcuts
Mobile Friendly
Fully responsive design for tablets and smartphones
Dark Mode
Eye-friendly interface with automatic dark mode support
Privacy & Performance
Local Processing
All formatting happens in your browser - code never leaves your device
Zero Server Upload
Your code remains 100% private and secure
Lightning Fast
Instant formatting for files up to 2MB
Smart Caching
Optimized performance with intelligent result caching
How to Use
Get started with code beautification in 4 simple steps
Step 1: Basic Formatting
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- Select your code language from the dropdown (JavaScript, TypeScript, HTML, CSS, or JSON)
- Paste or type your code in the left input area
- Click the "Format Code" button
- View the beautified code in the right output area
- Click "Copy" to copy the formatted result
Step 2: Customize Formatting Rules
prettier online tool with custom settings: The visual configuration panel lets you easily customize formatting rules to match your personal or team preferences.
- Click the "Settings" button to open the configuration panel
- Adjust formatting options: Indent (2 or 4 spaces, or tabs), Semicolons (add or omit), Quotes (single or double), Line Width (maximum characters per line)
- Apply your custom configuration and format
Step 3: Upload and Download Files
free code formatter for html and css: Batch upload functionality allows web developers to efficiently process multiple HTML and CSS files. online json prettifier with validation: JSON files are automatically validated during export.
- Upload Files: Click "Upload" or drag and drop files directly
- Batch Processing: Upload multiple files at once for bulk formatting
- Export Results: Click "Download" to save formatted files with preserved filenames
Step 4: Real-Time Preview & Shortcuts
how to beautify code in browser without install: No browser extensions needed - achieve instant code beautification directly on the webpage.
- Enable real-time preview to see changes as you type
- Use keyboard shortcuts like Ctrl+Alt+F for instant formatting
- Ctrl+Z to undo and Ctrl+Y to redo changes
Keyboard Shortcuts Reference
| Shortcut | Function | Description |
|---|---|---|
| Ctrl + Alt + F | Format Code | Instantly format current code |
| Ctrl + Z | Undo | Undo last operation |
| Ctrl + Y | Redo | Redo undone operation |
| Ctrl + S | Save | Download formatted code |
| Ctrl + O | Open | Open file selector |
| Ctrl + C | Copy | Copy selected code |
| Ctrl + V | Paste | Paste clipboard content |
Configuration Options Explained
JavaScript/TypeScript Options
- Semi
Add semicolons at the end of statements
- Single Quote
Use single quotes instead of double quotes
- Trailing Commas
Add trailing commas in multi-line structures
- Bracket Spacing
Add spaces inside object literal braces
- Arrow Parens
Add parentheses around single-parameter arrow functions
HTML Options
- Tab Width
Indentation size for HTML tags
- Wrap Attributes
Automatically wrap long attributes to new lines
- Self Closing
Use self-closing format for empty tags (<br />)
CSS Options
- Insert Final Newline
Add newline at end of file
- Bracket Same Line
Place opening brace on same line as selector
Use Cases
Real-world success stories from teams using our code beautifier
Enterprise Team Code Standardization
team code style enforcement tool onlineBackground
- Company: TechCorp Software Development
- Team Size: 50+ frontend developers
- Challenge: Inconsistent code styles across multiple projects causing inefficient code reviews
Solution
Teams can quickly unify standards through import/export configuration, avoiding style conflicts.
Process
- Configuration Setup: Tech lead creates unified formatting rules using the tool
- Team Training: 15-minute training session demonstrating tool usage
- Configuration Distribution: Ensure all developers use identical rules via config files
- Continuous Application: Format code before commits using the tool
Results
- ✅60% reduction in code review time: No need to focus on formatting issues
- ✅90% improvement in code consistency: Unified style across all projects
- ✅Faster onboarding: New employees quickly adapt to team standards
- ✅Lower maintenance costs: Significantly improved code readability and maintainability
real-time code formatting preview online: Real-time preview helps teams instantly verify configuration effectiveness.
Educational Institution Batch Assignment Processing
best online code beautifier for typescriptBackground
- Company:
- User Base: 2000+ students
- Organization: CodeAcademy Online Programming Platform
- Challenge: Student code formatting chaos affecting teaching effectiveness and grading
Solution
Teachers can batch format TypeScript assignments ensuring teaching consistency.
Results
- ✅80% increase in grading efficiency: Uniform format enables faster review
- ✅Improved learning experience: Students see standardized code formatting
- ✅45% better error detection: Syntax errors easier to identify after formatting
- ✅Enhanced teaching quality: Teachers focus on logic rather than formatting issues
mobile friendly code beautifier app: Mobile support allows teachers to process assignments anytime, anywhere.
Open Source Project Code Quality Enhancement
export formatted code configuration for teamsBackground
- Company:
- Contributors: 100+ developers
- Project: ReactUI Open Source Component Library
- Challenge: Massive code style differences from contributors with diverse backgrounds
Solution
Open source contributors export configurations to ensure PRs meet project standards.
Approach
- PR Template Update: Require tool formatting in contribution guidelines
- CI/CD Integration: Automatically check code formatting compliance
- Contributor Training: Provide detailed formatting tool usage guides
Results
- ✅50% reduction in PR review time: Maintainers focus on functionality review
- ✅Code quality score improvement: From B grade to A+ grade
- ✅Increased contributor satisfaction: Lower contribution barrier
- ✅Expanded project influence: More developers willing to contribute
Legacy Code Modernization
Background
- Company: FinanceApp Fintech Company
- Project: Frontend refactor of 10-year-old core trading system
- Challenge: 500,000 lines of legacy JavaScript code with chaotic formatting
Results
- ✅3x development efficiency increase: Dramatically improved code readability
- ✅200% better bug detection: Issues easier to find after standardization
- ✅70% lower maintenance costs: Easier new feature development and maintenance
- ✅Improved team collaboration: Both new and veteran developers quickly understand code
Case Study Summary
| Scenario Type | Primary Value | Recommended Configuration |
|---|---|---|
| Team Collaboration | Unify code style, improve collaboration efficiency | Strict config, enforce semicolons |
| Education & Training | Help learners develop good coding habits | Education-friendly, clear indentation |
| Open Source Projects | Lower contribution barrier, improve code quality | Standard config, strong compatibility |
| Enterprise Applications | Improve code maintainability and readability | Enterprise standard, strict rules |
Best Practices
- 1.Unified Configuration: Use consistent formatting configuration at team or project level
- 2.Automation Integration: Combine with CI/CD processes to ensure code quality
- 3.Progressive Application: Apply formatting module by module for large projects
- 4.Training Support: Provide tool usage training for team members
- 5.Continuous Optimization: Adjust formatting rules based on project evolution
FAQ - Frequently Asked Questions
Everything you need to know about using our code beautifier
Basic Usage
What programming languages are supported?
Currently supports: JavaScript (ES5/ES6+, JSX), TypeScript (TSX support), HTML (HTML5, Vue/Angular templates), CSS (CSS3, SCSS, Less), and JSON (Standard JSON, JSON5). Planned support: Python, Java, C++, Go, Rust, PHP.
how to format javascript code online free: JavaScript is the most popular language with free online formatting support.
What is the maximum file size limit?
Single file: Maximum 2MB. Batch processing: Up to 10 files, total size not exceeding 5MB. Recommendation: For very large files, process in segments for better performance.
prettier online tool with custom settings: Custom settings work for large files, ensuring efficient processing.
Will formatted code lose functionality?
No! Our formatting process is syntax safe (based on AST parsing), preserves logic completely, retains all comments, and only adjusts code format and style.
free code formatter for html and css: HTML/CSS formatting preserves all functionality.
Configuration
How do I save my formatting configuration?
Configuration automatically saves in local browser. Click 'Export Config' to download configuration file, or 'Import Config' to upload. Configuration files can be shared among team members.
online json prettifier with validation: JSON configuration is automatically validated when saved.
Can I create custom formatting rules?
Yes! We provide preset rules (Standard, Airbnb, Google) and you can modify all Prettier-supported options. ESLint rule integration is planned, and future enterprise edition will support completely custom rules.
how to beautify code in browser without install: Customize rules directly in browser without installation.
Does it support team collaboration?
Yes! Share configurations through files to achieve team standardization. You can share code and configuration via links. Real-time collaboration and version control features are in development.
team code style enforcement tool online: Online tool perfectly supports team collaboration.
Technical Issues
What if formatting is slow?
Try these optimizations: Break large files into smaller chunks, disable real-time preview in settings, clear browser cache and cookies, and ensure browser has sufficient memory.
real-time code formatting preview online: Disabling preview can speed up processing.
What if formatting fails?
Follow these troubleshooting steps: 1) Check syntax correctness, 2) Confirm correct language type is selected, 3) Try formatting code snippets to locate issue, 4) Refresh page and retry, 5) Report problem through feedback button.
best online code beautifier for typescript: For TypeScript failures, check syntax compatibility.
Does it work properly on mobile devices?
Yes! Fully compatible with iOS Safari and Android Chrome, with touch-optimized interface and mobile-specific performance optimizations. Some advanced features are simplified on mobile.
mobile friendly code beautifier app: Mobile-friendly design enables use anytime, anywhere.
Security & Privacy
Is my code data secure?
Absolutely! All formatting happens locally in your browser. Code is never sent to our servers, only temporarily stored in current session, and automatically cleared when page is closed.
export formatted code configuration for teams: Configuration export ensures secure data sharing.
How do I handle batch files?
Simply drag and drop multiple files for automatic formatting and export. Perfect for large projects with many files.
free code formatter for html and css: Batch HTML/CSS processing saves time.
Can it integrate with CI/CD pipelines?
Yes! Integrates with GitHub Actions and other tools through API or configuration files for automated code formatting in your deployment pipeline.
team code style enforcement tool online: Online tool easily integrates with CI/CD.
Related Resources
External Documentation
Code Style Guides
Technical Specifications
Supported Formats
- JavaScript
ES5, ES6+, JSX, Node.js
- TypeScript
TS, TSX, Type Definitions
- HTML
HTML5, Vue Templates, Angular Templates
- CSS
CSS3, SCSS, SASS, Less
- JSON
JSON, JSON5, JSONC
Browser Compatibility
- ✅Chrome 90+
- ✅Firefox 88+
- ✅Safari 14+
- ✅Edge 90+
- ✅Mobile Browsers (iOS Safari, Chrome Mobile)
Performance Benchmarks
- Small files (<10KB)
<50ms
- Medium files (10-100KB)
<200ms
- Large files (100KB-2MB)
<1s
- Batch processing
5-10 files/second