UTF-8 Byte Encoder

About this calculator

UTF-8 encodes every Unicode code point as 1 to 4 bytes: ASCII characters (U+0000–U+007F) take a single byte, most Latin-extended and common symbols take 2 bytes, most CJK and other BMP characters take 3 bytes, and emoji and rarer characters outside the Basic Multilingual Plane take 4 bytes — which is why a string's byte length can be much larger than its character count once accents, non-Latin scripts, or emoji are involved.

This tool encodes any text to UTF-8 and shows the total byte length, the raw hex bytes, and a per-codepoint breakdown of how each character was encoded. Backend and mobile developers use it to debug byte-length limits in databases, APIs, or SMS/push-notification payloads where character count and byte count diverge, and students learning encoding use it to see the byte structure behind Unicode text firsthand.