UTF-8

Encoding & Standards

每字符使用1至4个字节的可变长度Unicode编码方式，是互联网上最主流的编码，被98%以上的网站采用。

UTF-8 is the most widely used Unicode encoding. ASCII characters (U+0000 to U+007F) use 1 byte, making it backward-compatible with ASCII. Characters beyond ASCII use 2-4 bytes.

Most emoji require 4 bytes in UTF-8 because they live in the Supplementary Multilingual Plane (code points above U+FFFF). For example, 😀 (U+1F600) encodes as 0xF0 0x9F 0x98 0x80.

UTF-8's dominance on the web (recommended by W3C, used by HTML5 by default) makes it the standard choice for storing and transmitting emoji in most applications.

相关术语

BOM（字节顺序标记） (BOM) BOM（字节顺序标记） (BOM)
放置在文本文件开头的字符（U+FEFF），用于指示UTF-16/UTF-32编码中的字节顺序（字节序）。 UTF-16 UTF-16
每字符使用2或4个字节的可变长度Unicode编码方式，被JavaScript、Java和Windows内部使用。 UTF-32 UTF-32
每字符固定使用4个字节的Unicode编码方式，可直接映射到码位，但存储效率较低。 编码单元 编码单元
用于编码字符的最小位组合：UTF-8为8位，UTF-16为16位，UTF-32为32位。

相关工具

🔢 Unicode 查询 Unicode 查询
输入 U+1F600 等码位，获取表情符号、编码详情、UTF-8/16 字节和 HTML 实体。

相关故事

Unicode Lookup: Find Any Emoji by Code Point
Enter a Unicode code point like U+1F600 or paste an emoji to see its full encoding breakdown — UTF-8, UTF-16, HTML entities, and more.
How to Use Emojis in Python: A Developer's Complete Guide
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How to Use Emojis in HTML: Entities, UTF-8, and CSS
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How to Type Emojis on Linux: IBus, GNOME, KDE, and More
Learn how to type emojis on Linux using IBus, GNOME's built-in picker, KDE, Unicode input, and terminal methods. Full guide for all desktop environments.
How to Find the Unicode Code Point for Any Emoji
Find the Unicode code point of any emoji using EmojiFYI, browser DevTools, Python, JavaScript, and the Unicode Character Database.