Question 1

Why might string length differ between languages?

Accepted Answer

JavaScript counts UTF-16 code units. Python 3 counts Unicode code points. Java counts UTF-16 code units like JavaScript. Go counts bytes (UTF-8 encoding). Emoji like 😀 count as 1 character visually but 2 in JavaScript (a surrogate pair). This tool shows all representations.

Question 2

What is the difference between characters, bytes, and code points?

Accepted Answer

Characters are what you see visually. Code points are Unicode scalar values (U+0000 to U+10FFFF). UTF-8 bytes is how many bytes the string uses in UTF-8 encoding (ASCII = 1 byte, common unicode = 2-3 bytes, emoji = 4 bytes). UTF-16 units is how JavaScript measures strings.

Question 3

What is a grapheme cluster?

Accepted Answer

A grapheme is what a user perceives as a single character. Some characters appear as one but consist of multiple code points: é can be U+00E9 (1 code point) or e + U+0301 combining accent (2 code points). Emoji with skin tones can be 2-4 code points. Grapheme count is what users see.

Question 4

How do database VARCHAR limits work?

Accepted Answer

MySQL/MariaDB VARCHAR(n) counts characters (code points). SQL Server nvarchar(n) counts UTF-16 code units. PostgreSQL varchar(n) counts code points. PostgreSQL text columns have no limit. Always test with multibyte characters when defining database column lengths.

Question 5

What are the common string length limits?

Accepted Answer

Twitter: 280 characters. SMS: 160 GSM-7 characters (70 UCS-2 for unicode). URL: 2048 characters max (varies by browser). HTTP header value: 8192 bytes typical. Cookie: 4096 bytes. GitHub commit message: first line should be 72 characters, total 10MB.

Question 6

How do I count characters in text?

Accepted Answer

Paste your text above for an instant character count. The tool shows total characters, characters without spaces, word count, line count, and byte size in UTF-8. This is useful for checking against API limits (Twitter's 280 characters, SMS 160 characters, meta descriptions 155-160 characters) and database field length constraints.

Question 7

What is the difference between character count and byte count?

Accepted Answer

ASCII characters (standard English letters) are 1 byte each in UTF-8. Non-ASCII characters (accented letters, CJK characters, emoji) use 2-4 bytes. A string of 10 emoji characters has a character count of 10 but a byte count of 40 (4 bytes x 10). Database VARCHAR limits are usually in bytes, so multi-byte characters reduce the effective character limit.

String Length Counter — Free Online Character & Byte Counter

Frequently Asked Questions

String Length: Characters, Bytes, and Unicode Complexity

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