UTF-8 bytes vs characters?

ASCII letters are one byte each in UTF-8; many symbols use multiple bytes.

Some emoji use two UTF-16 code units in JS strings, so character count can differ from visual length.

Each line break counts as character(s) depending on how it was pasted.

Character Counter Online – With/Without Spaces & UTF-8 Bytes

Check limits for APIs, SMS, or databases: character count and UTF-8 byte length update together as you edit.

Text

Counts

The character total matches JavaScript string length.

UTF-8 byte length is what you would get encoding the string as UTF-8.

Very large pastes may slow the page; use reasonable sizes.

Local processing only.

UTF-8 bytes vs characters?: ASCII letters are one byte each in UTF-8; many symbols use multiple bytes.
Emoji?: Some emoji use two UTF-16 code units in JS strings, so character count can differ from visual length.
Newlines?: Each line break counts as character(s) depending on how it was pasted.
Server upload?: No.