What is a byte counter?

A byte counter calculates the actual storage size of text in bytes, which can differ from character count due to encoding (like UTF-8 where emojis use 4 bytes).

Why do byte counts differ from character counts?

In UTF-8, ASCII characters use 1 byte, but extended characters like emojis can use 2-4 bytes. This is why 'hello' is 5 bytes but a single emoji can be 4 bytes.

What encodings are supported?

We show byte sizes for UTF-8 (most common), UTF-16 (Windows/Java), and ASCII encoding.

Mizakii Tools

Tools

Byte Counter

Name: Byte Counter
Availability: InStock
Author: Mizakii

Count bytes and analyze text encoding in real-time.

Byte Counter

Analyze text size in different encodings

Enter Text

UTF-8 Size

0 B

UTF-16 Size

0 B

Characters

Words

Lines

Spaces

Non-ASCII

Tip: UTF-8 is most common for web. ASCII characters use 1 byte, while emojis and special characters can use 2-4 bytes.

Bytes, Characters & Text Encoding Reference

1. Paste your text

Paste or type any text. The counter shows bytes in UTF-8, UTF-16, and ASCII encodings simultaneously, plus character count with and without spaces.

2. Check encoding sizes

Different encodings produce different byte counts for the same text. UTF-8 is most common on the web. UTF-16 is used internally by JavaScript and Java. ASCII only covers basic English characters.

3. Use for limits

Many systems enforce byte limits rather than character limits. Database columns (VARCHAR, TEXT), API payloads, and protocol buffers use byte sizes — not character counts.

Character Encoding Comparison

Encoding	Bytes per ASCII char	Bytes per emoji	Used In
ASCII	1 byte	Not supported	Legacy systems, basic English text
UTF-8	1 byte	4 bytes	Web (HTML, JSON, CSS), Linux, macOS
UTF-16	2 bytes	4 bytes	Windows, Java, JavaScript internally
UTF-32	4 bytes	4 bytes	Fixed-width — rarely used in production

Why Byte Count Differs from Character Count

In ASCII text, 1 character = 1 byte. But in Unicode (UTF-8), characters outside the basic ASCII range use multiple bytes. An accented character like é uses 2 bytes. A Chinese character uses 3 bytes. An emoji uses 4 bytes. This means "hello 😊" is 7 characters but 10 bytes in UTF-8. This distinction matters for database column sizes, HTTP Content-Length headers, and any system with byte-based limits.