Unidad de código

Encoding & Standards

La combinación mínima de bits utilizada para codificar un carácter: 8 bits para UTF-8, 16 bits para UTF-16 y 32 bits para UTF-32.

A code unit is the fundamental building block of a Unicode encoding form. It's important to distinguish code units from code points — a single code point may require multiple code units depending on the encoding.

In UTF-8, a code unit is 8 bits (1 byte). The emoji 😀 requires 4 code units. In UTF-16, a code unit is 16 bits (2 bytes). The same emoji requires 2 code units (a surrogate pair). In UTF-32, it's 1 code unit (4 bytes).

Many programming language string APIs operate on code units rather than code points, which is why string length calculations can be confusing with emoji.

Términos relacionados

Par sustituto Par sustituto
Dos unidades de código UTF-16 (un sustituto alto U+D800–U+DBFF seguido de un sustituto bajo U+DC00–U+DFFF) que juntas representan un carácter superior a U+FFFF. UTF-16 UTF-16
Codificación Unicode de ancho variable que utiliza 2 o 4 bytes por carácter, empleada internamente por JavaScript, Java y Windows. UTF-32 UTF-32
Codificación Unicode de ancho fijo que utiliza exactamente 4 bytes por carácter, lo que permite un mapeo directo de puntos de código a costa de mayor espacio. UTF-8 UTF-8
Codificación Unicode de ancho variable que utiliza de 1 a 4 bytes por carácter, dominante en la web (usada por más del 98 % de los sitios web).

Herramientas relacionadas

🔢 Búsqueda Unicode Búsqueda Unicode
Ingresa un punto de código como U+1F600 y obtén el emoji, detalles de codificación, bytes UTF-8/16 y entidades HTML.

Artículos relacionados

Unicode Lookup: Find Any Emoji by Code Point
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How to Handle Emojis in JavaScript: Strings, Length, and Rendering
Learn how to work with emojis in JavaScript: string length pitfalls, Unicode code points, regex, grapheme segmentation, and React rendering tips.
Why string.length Lies: Grapheme Clusters and Emoji Length
Why string.length fails for emoji, what grapheme clusters are, and how to correctly count characters in JavaScript, Python, and more.
Emoji String Length Gotchas: Surrogate Pairs, Grapheme Clusters, and Byte Counts
Why emoji cause surprising string length results in Python, JavaScript, and Go — surrogate pairs, grapheme clusters, and how to count correctly.
Emoji Security: Homoglyphs, Spoofing, Invisible Characters, and Filtering
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Emoji Regex Patterns: Matching Emojis in JavaScript and Python
Learn how to write reliable regex patterns to match emojis in JavaScript and Python, including ZWJ sequences, skin tones, and flags.