✨ Code Beautifier — HTML, CSS & JS Formatter
Beautify and format HTML, CSS, and JavaScript code with configurable indentation. Paste messy code and get clean, readable output instantly. Free online code formatter.
How to Use
1
Select the language
Choose HTML, CSS, or JavaScript using the tabs at the top. Each language applies its own formatting rules.
2
Paste and configure
Paste your minified or unformatted code in the left panel. Choose your preferred indent size (2 spaces, 4 spaces, or tab).
3
Beautify and copy
Click Beautify (or Ctrl+Enter). The formatted code appears on the right. Click Copy to copy it to your clipboard.
Frequently Asked Questions
What languages are supported?
HTML, CSS, and JavaScript. Switch between them using the tabs at the top. Each language uses language-specific formatting rules.
What library powers the formatter?
js-beautify v1.14, loaded on demand from cdnjs. It is the same library bundled in VS Code and used by millions of developers.
Can it format minified code?
Yes — paste any minified HTML, CSS, or JS and click Beautify. The output will be properly indented and human-readable.
Is the library loaded only when needed?
Yes. js-beautify (three files, ~90 KB combined) is only fetched when you click Beautify for the first time, keeping the page load fast.
完整指南：HTML/CSS/JS代码美化工具
什么是代码美化工具？
将结构不一致或压缩的代码重新格式化，应用一致的缩进、空格和换行，但不改变功能。与Prettier（更有主见）或Linter（报告错误）不同——只清理代码结构。
如何使用
- 选择语言：HTML、CSS或JavaScript。
- 粘贴代码到输入区。
- 配置缩进：2空格、4空格或Tab。
- 美化（Ctrl+Enter）并复制。
专业技巧
- 团队项目使用带共享
.prettierrc的Prettier。 - 集成到CI/CD自动检查代码格式。
- 理解需要的修改后再美化生产环境的压缩代码。