Why is UTF-8 the most popular encoding on the web?

UTF-8 is ASCII-compatible, uses variable-length bytes, has no byte-order issues, and powers the vast majority of web pages today.

How many bytes does a Chinese character take?

A common CJK character uses 3 bytes in UTF-8; rare supplementary-plane characters may use 4—the tool shows each byte sequence.

Yes. UTF-8 covers every Unicode code point, including emoji and supplementary-plane scripts; the tool maps code points to bytes.

Text

UTF-8

Click the examples below to quickly experience different types of string encoding

💡 Tip: Click any example to quickly fill in, supports Chinese, Unicode, Emoji and other character types

Unicode
Binary
UTF-8

Prefix Code

Unicode Binary Group

Unicode Binary Group Distinct

Part of tool topic

Base64 encode and decode online with UTF-8 and visual breakdown

JWT decode online—parse headers, payloads, and verify signatures

Comprehensive symmetric encryption algorithms

Convert Unicode to Code Point

Unicode to UTF-16 conversion with internal principle demonstration

Unicode to UTF-32 conversion with internal principle demonstration