Byte Counter

Instantly calculate byte counts for any text in UTF-8, Shift-JIS, and EUC-JP. Helpful for SEO title and meta description length checks.

Enter Text

Character Count

Lines

UTF-8

0bytes（0 B）

Shift-JISEstimated

0bytes（0 B）

EUC-JPEstimated

0bytes（0 B）

SEO Guidelines

How to Use

STEP 1
Paste or type text into the input area.
STEP 2
Byte counts for UTF-8, Shift-JIS, and EUC-JP update in real time.
STEP 3
Check the SEO guide section to see if your title or description is within recommended limits.

Shift-JIS and EUC-JP byte counts are approximate estimates. Exact conversion is not possible in the browser, so results may differ from actual encoding. Only UTF-8 is accurate.
Emoji (surrogate pairs) count as 4 bytes in UTF-8.

Modern HTML uses UTF-8, but legacy systems may use Shift-JIS for data exchange.

Google's title tag display limit is roughly 600px wide (~70 bytes / ~35 full-width chars).

MySQL VARCHAR limits are in bytes (utf8mb4 = 4 bytes/char), so use this tool to verify.

Q1
Why do the same characters have different byte counts per encoding?
Each encoding uses a different number of bytes to represent characters. For example, a Japanese character is 3 bytes in UTF-8 but 2 bytes in Shift-JIS.
Q2
Is UTF-8 different from UTF-16?
Yes. This tool calculates UTF-8 only, which is the web standard. UTF-16 is rarely used on the web.
Q3
What is the SEO title character limit?
Google measures pixel width (~600px), but the general guideline is ≤70 bytes / ≤35 full-width characters.