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🔤 Unicode 转 UTF-16Convert Unicode to UTF-16
写成 UTF-16 码元的十六进制（可含 BOM）。本地处理。可设置「字节序」、「加 BOM (FEFF)」。Write UTF-16 code units as hex (optional BOM). Processed locally. Settings: Byte order, Add BOM (FEFF).
使用说明与常见问题How-to & FAQ
「Unicode 转 UTF-16」是什么？What is the Convert Unicode to UTF-16 tool?
写成 UTF-16 码元的十六进制（可含 BOM）。本地处理。可设置「字节序」、「加 BOM (FEFF)」。Write UTF-16 code units as hex (optional BOM). Processed locally. Settings: Byte order, Add BOM (FEFF).
如何使用「Unicode 转 UTF-16」？How do I use the Convert Unicode to UTF-16 tool?
在「Unicode 转 UTF-16」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「A」，得到「0041」。In the Convert Unicode to UTF-16: Paste or type into the input box, adjust "Byte order"; the result appears below instantly — click "Copy result" to copy it. Example: "A" → "0041".
表情符号会输出几个码元？How many units does an emoji give?
UTF-16 中基本平面以外的字符要用两个 16 位码元（代理对）表示，例如 😀 输出 d83d de00。勾选“加 BOM”时开头会多一个 feff。In UTF-16, characters outside the Basic Multilingual Plane need two 16-bit units (a surrogate pair), so 😀 gives d83d de00. With Add BOM ticked, a feff is added at the start.
是大端还是小端？Big-endian or little-endian?
默认大端（BE），每个码元先写高字节，如 A = 0041；选“小端 LE”则先写低字节，如 A = 4100，BOM 写成 fffe。Big-endian (BE) by default, with the high byte first, so A is 0041. Choose Little-endian (LE) to put the low byte first, so A is 4100 and the BOM is fffe.
输入和输出是什么样的？What does the input and output look like?
例如在「Unicode 转 UTF-16」中输入 A，输出为：0041。For example, the Convert Unicode to UTF-16 turns the input A into: 0041.
有哪些选项可以调整？What options can I adjust?
「Unicode 转 UTF-16」的设置：「字节序」可选 大端 BE、小端 LE（默认 大端 BE）；可勾选：「加 BOM (FEFF)」。每次生成结果都按当前设置处理。Settings in the Convert Unicode to UTF-16 — "Byte order": Big-endian (BE), Little-endian (LE) (default Big-endian (BE)); tick boxes: "Add BOM (FEFF)". 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。「Unicode 转 UTF-16」的处理全部在本地完成。No. Encoding (Base64, URL…) is reversible by anyone; encryption needs a key. The Convert Unicode to UTF-16 works fully offline in your browser.
「Unicode 转 UTF-16」免费吗？需要注册吗？Is the Convert Unicode to UTF-16 free? Do I need an account?
「Unicode 转 UTF-16」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 Unicode to UTF-16 is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.