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🔤 UTF-16 转 UTF-8 文本Convert UTF-16 to UTF-8
把 UTF-16 码元（每个 4 位十六进制）解码成文本，支持大端/小端和 BOM。本地处理。Decode UTF-16 code units (4 hex digits each) into text, with big-endian/little-endian and BOM handling. Processed locally.
使用说明与常见问题How-to & FAQ
「UTF-16 转 UTF-8 文本」是什么？What is the Convert UTF-16 to UTF-8 tool?
把 UTF-16 码元（每个 4 位十六进制）解码成文本，支持大端/小端和 BOM。本地处理。Decode UTF-16 code units (4 hex digits each) into text, with big-endian/little-endian and BOM handling. Processed locally.
如何使用「UTF-16 转 UTF-8 文本」？How do I use the Convert UTF-16 to UTF-8 tool?
在「UTF-16 转 UTF-8 文本」中，把内容粘贴或输入到上方输入框，按需设置「字节序」，结果会实时显示在下方，点击「复制结果」即可复制。例如输入「0048 0069」，得到「Hi」。In the Convert UTF-16 to UTF-8: Paste or type into the input box, adjust "Byte order"; the result appears below instantly — click "Copy result" to copy it. Example: "0048 0069" → "Hi".
表情等辅助平面字符怎么输入？How do I enter emoji and other characters outside the BMP?
按顺序输入一对代理码元：先高位代理（D800–DBFF），再低位代理（DC00–DFFF），例如 😀 = D83D DE00。单独出现的代理码元会报错并指出是第几个码元。Enter the surrogate pair in order: the high surrogate (D800–DBFF) first, then the low surrogate (DC00–DFFF). For example 😀 = D83D DE00. A surrogate on its own is an error that names its position.
大端、小端和 BOM 怎么处理？How are byte order and the BOM handled?
「自动」按开头的 BOM 判断：FEFF 是大端，FFFE 是小端，BOM 会被去掉；没有 BOM 时按大端读。也可以直接选大端或小端；小端时每个码元的两个字节会对调（如 4800 读作 0048）。Auto looks at a leading BOM: FEFF means big-endian and FFFE means little-endian, and the BOM is removed. Without a BOM the units are read as big-endian. You can also pick big-endian or little-endian; in little-endian the two bytes of each unit are swapped (4800 is read as 0048).
码元要怎么写？How do I write the units?
每个码元正好 4 位十六进制（大小写都可以，可加 0x 或 \u 前缀），用空格、逗号、分号或换行分隔。位数不对的码元会被原样引用并报错。Each unit is exactly 4 hex digits (any case, optionally with a 0x or \u prefix), separated by spaces, commas, semicolons or new lines. A unit with the wrong number of digits is quoted in the error.
输入和输出是什么样的？What does the input and output look like?
例如在「UTF-16 转 UTF-8 文本」中输入 0048 0069，输出为：Hi。For example, the Convert UTF-16 to UTF-8 turns the input 0048 0069 into: Hi.
有哪些选项可以调整？What options can I adjust?
「UTF-16 转 UTF-8 文本」的设置：「字节序」可选 自动（看 BOM，无 BOM 按大端）、大端 BE、小端 LE（默认 自动（看 BOM，无 BOM 按大端））。每次生成结果都按当前设置处理。Settings in the Convert UTF-16 to UTF-8 — "Byte order": Auto (BOM, else big-endian), Big-endian (BE), Little-endian (LE) (default Auto (BOM, else big-endian)). The result always uses the current settings.
编码和加密有什么区别？Is encoding the same as encryption?
编码（如 Base64、URL 编码）可直接还原，不提供保密性；加密需要密钥。「UTF-16 转 UTF-8 文本」的处理全部在本地完成。No. Encoding (Base64, URL…) is reversible by anyone; encryption needs a key. The Convert UTF-16 to UTF-8 works fully offline in your browser.
「UTF-16 转 UTF-8 文本」免费吗？需要注册吗？Is the Convert UTF-16 to UTF-8 free? Do I need an account?
「UTF-16 转 UTF-8 文本」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-16 to UTF-8 is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.