Byte Counter

When to use?

Use it before saving to a byte-limited DB column like MySQL VARCHAR(255), or to gauge an HTTP request body size. Korean text has different character and byte counts, so check separately.

How to use

• Type or paste the text to check.
• The UTF-8 byte count updates in real time.
• Compare against your byte limit to check for overflow.

Input Explanation

Enter any text — Korean, English, numbers, symbols, emoji. Calculation is based on UTF-8 encoding.

Calculation Basis

In UTF-8, letters/numbers are 1 byte, Korean is typically 3 bytes, and emoji usually 4 bytes. Character count and byte count can differ.

Usage Examples

• Validate DB column capacity - Check for overflow before saving to a byte-limited column like VARCHAR(255).
• Check API payload size - Gauge the real size of an HTTP request body in advance.
• Check filename bytes - Check whether a filename with Korean exceeds a system limit.

Examples

• "Hello" (5 chars) → 5 bytes
• A 5-character Korean word → 15 bytes (1 Korean char = 3 bytes)

Cautions

• In MySQL VARCHAR(n), n is a character count, not bytes. Check the column setting for the real byte limit.
• Results may differ from other tools depending on line-break handling and Unicode (UTF-8) splitting.

Guides

UTF-8 byte basis

In UTF-8, Korean is usually 3 bytes per character and English/numbers are 1 byte. Emoji and special characters can use more bytes.

Check DB and API limits

DB columns and API request sizes are often byte-based, not character-based. Check the actual byte count before saving.

FAQ

How many bytes is Korean?

In UTF-8, most Korean characters are 3 bytes each.

Are other encodings besides UTF-8 supported?

It currently calculates only on a UTF-8 basis.

How many bytes is an emoji?

In UTF-8, most emoji are stored as 4 bytes.

Why do character and byte counts differ?

Character count is the number of characters; byte count is the actual storage size.

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