Format and beautify HTML, CSS, and JavaScript code with proper indentation and line breaks. Auto-detects the language or select manually. Minify mode available for each language. Large inputs processed off-thread.
LevnTools Code Beautifier lets you format, validate, and transform your code directly in your browser. Everything runs locally in your browser — your code and data never leave your device. Unlike cloud-only alternatives that require uploads and accounts, this tool is completely free with no usage limits or watermarks. It is designed for developers debugging API responses, DevOps engineers working with configuration files, students learning data formats — anyone who needs a fast, reliable developer tool without the overhead of installing software. Just open the page and start working.
Code Beautifier is used by a wide range of people. Explore how different groups use this tool:
Format, beautify, minify, and validate JSON with syntax highlighting.
Encode and decode Base64 with UTF-8 support and file-to-data-URI.
Encode, decode, and parse URLs with editable query parameters.
Convert text to camelCase, snake_case, kebab-case, and 7 more.
Convert between metric and imperial length units.
The tool formats three languages: HTML (with proper tag nesting and indentation), CSS (with properties on separate lines), and JavaScript (with block indentation and statement separation). Auto-detection selects the language based on your input.
Choose between 2 spaces, 4 spaces, or tabs for indentation. The selected style is applied uniformly throughout the formatted output. You can change the setting and re-format at any time.
Yes. Click the "Minify" button to remove all unnecessary whitespace, comments, and line breaks. CSS minification also shortens hex color codes like #AABBCC to #ABC where possible.
Inputs larger than 50 KB are automatically processed in a Web Worker to keep the page responsive. There is no hard size limit — performance depends on your device.
No. This is a lightweight formatter focused on basic indentation and line breaks. It does not perform AST-based formatting like Prettier. For complex formatting needs, a full-featured formatter is recommended.