Is this tool free to use?

Yes, this tool is completely free to use. No registration, subscription, or payment is required. All processing happens directly in your browser.

Does this tool upload data to a server?

No. All processing happens locally in your browser using JavaScript. Your data never leaves your device, ensuring complete privacy and security. The tool works even when offline.

Does this tool work on mobile devices?

Yes, this tool is fully responsive and works on all modern browsers including Chrome, Safari, Firefox, and Edge on desktop, tablet, and mobile devices.

Is an internet connection required to use this tool?

No internet connection is required after the page loads. Since all processing happens in your browser, you can use this tool offline once the page is loaded.

Is there a file size limit?

There is no server-side file size limit since files are processed locally in your browser. The only limitation is your device's memory (RAM). For very large files, we recommend processing them in smaller chunks.

✨ Syntax Highlighter

Free online syntax highlighter. Convert code into syntax-highlighted HTML with line numbers. Supports JavaScript, Python, HTML, CSS, Java, C++ and more. Customizable dark/light themes. One-click copy highlighted HTML. Perfect for bloggers, developers, and technical writers. Client-side only.

Language

Theme

Input Code

Highlighted Preview

Click "Highlight" to see result

How to Use the Syntax Highlighter

Using the Syntax Highlighter is straightforward:

Enter Your Values
Input the required numbers and parameters into the calculator fields. Each field is clearly labeled — simply type your values or use the spinner controls to adjust them.
Configure Options
Select any additional options such as computation mode, currency, time period, or precision level. The calculator updates automatically as you change values.
View the Results
The calculated result is displayed instantly with clear formatting. You can Copy the result to your clipboard or adjust input values to see how different scenarios affect the outcome.

FAQ

支持哪些编程语言？

目前支持 JavaScript、Python、HTML、CSS、Java、C++、C、C#、Go、Rust、TypeScript、Ruby、PHP、Swift、Kotlin、SQL、Shell/Bash、YAML、JSON、XML 等主流编程语言和标记语言。更多语言持续添加中。

代码会被上传到服务器吗？

不会。所有语法高亮处理完全在浏览器本地使用 JavaScript 完成。你的代码不会离开你的电脑，确保代码安全和隐私。

如何将高亮后的代码用于博客？

点击“复制HTML”按钮，然后将复制的 HTML 代码粘贴到你的博客编辑器的 HTML 视图中。支持大多数博客平台（WordPress、Blogger、Medium等支持自定义HTML的编辑器中粘贴即可。

高亮效果准确吗？

本工具使用基于关键词和正则表达式的高亮引擎，对于常见语法结构有较好的识别效果。但对于非常复杂的嵌套语法或非标准写法，可能不完全准确。如果需要精确的高亮，建议使用专业的IDE或代码高亮库。