🔠 UTF-8 文本转大写Convert UTF-8 to Uppercase
用 JavaScript 的 toUpperCase() 把文本转为大写：完整的 Unicode 大小写映射（如 ß → SS），与语言区域无关。本地处理。Uppercase the text with JavaScript toUpperCase(): full Unicode case mapping (e.g. ß → SS), the same in every locale. Processed locally.
使用说明与常见问题How-to & FAQ
「UTF-8 文本转大写」是什么？What is the Convert UTF-8 to Uppercase tool?
用 JavaScript 的 toUpperCase() 把文本转为大写：完整的 Unicode 大小写映射（如 ß → SS），与语言区域无关。本地处理。Uppercase the text with JavaScript toUpperCase(): full Unicode case mapping (e.g. ß → SS), the same in every locale. Processed locally.
如何使用「UTF-8 文本转大写」？How do I use the Convert UTF-8 to Uppercase tool?
在「UTF-8 文本转大写」中，把内容粘贴或输入到上方输入框，结果会实时显示在下方，点击「复制结果」即可复制。例如输入「hi」，得到「HI」。In the Convert UTF-8 to Uppercase: Paste or type into the input box; the result appears below instantly — click "Copy result" to copy it. Example: "hi" → "HI".
德文 ß 会变成什么？What does the German ß become?
变成 SS。这是 Unicode 的完整大写映射，所以结果可能比原文长；fi 这类连字也会拆开（fi → FI）。It becomes SS. This is Unicode full case mapping, so the result can be longer than the input; ligatures such as fi are split as well (fi → FI).
输入和输出是什么样的？What does the input and output look like?
例如在「UTF-8 文本转大写」中输入 hi，输出为：HI。For example, the Convert UTF-8 to Uppercase turns the input hi into: HI.
处理大段文本会卡吗？Can it handle long text?
「UTF-8 文本转大写」在浏览器中直接处理，几 MB 以内的文本通常瞬间完成；文本不会离开你的设备。The Convert UTF-8 to Uppercase runs in your browser; text up to a few MB is usually processed instantly and never leaves your device.
「UTF-8 文本转大写」免费吗？需要注册吗？Is the Convert UTF-8 to Uppercase free? Do I need an account?
「UTF-8 文本转大写」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Convert UTF-8 to Uppercase is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.