Understanding Unicode: The Encoding Behind Every Text
Learn how Unicode and UTF-8 encoding work, why they matter, and how they handle every character in every language.
By RiseTop Team · May 2026 · 8 min read
Unicode is the universal character encoding standard that assigns a unique number to every character in every language. UTF-8 is used by over 98% of websites.
UTF-8 Encoding
UTF-8 is a variable-length encoding using 1-4 bytes per character:
Bytes
Characters
Example
1 byte
ASCII (0-127)
A, 0, space
2 bytes
Latin extended, Cyrillic
e, e
3 bytes
Asian scripts
CJK characters
4 bytes
Emoji, rare scripts
heart, rocket
Common Issues
Mojibake: text displayed with wrong encoding shows as garbage
BOM: byte order mark at file start can cause issues
Normalization: same character can have multiple byte representations
Frequently Asked Questions
What is the difference between Unicode and UTF-8? +
Unicode is the character set mapping. UTF-8 is one way to encode those numbers as bytes. Other encodings include UTF-16 and UTF-32.
Why does UTF-8 dominate the web? +
It is backward compatible with ASCII, handles all languages efficiently, and is self-synchronizing.
What is a BOM? +
BOM (Byte Order Mark) is Unicode character U+FEFF at the start of a file. UTF-8 BOM is unnecessary and can cause issues.