UTF-8 Byte Length Calculator

Measure storage/transmission length locally and see why emoji and non-ASCII text can use multiple UTF-8 bytes.

Text

—UTF-8 bytes

—Unicode code points

—UTF-16 code units

—ASCII-range bytes

These tools operate on bytes and Unicode text locally. “Text to hex/binary/decimal” means the UTF-8 encoding of the text, not the numeric Unicode code point unless a tool explicitly says code point.

How to use this UTF-8 Byte Length Calculator

Calculate UTF-8 byte length, Unicode code-point count, and UTF-16 code-unit count for text. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.