📐String Length Calculator

Calculate the byte length of strings in various encodings.

Enter Text

Character Count

Byte Count (UTF-8)

Byte Count (UTF-16)

Word Count

Line Count

About String Length Calculator

Measure the exact length of any string in characters and bytes across multiple encodings including UTF-8, UTF-16, and ASCII. See how the same text takes different amounts of storage depending on the encoding. Essential for developers working with database field limits, API payload constraints, and multi-byte character sets.

How to Use String Length Calculator

1
Enter your string
Type or paste the text whose length you want to measure.
2
View measurements
See the character count and byte length in UTF-8, UTF-16, and ASCII encodings in real time.
3
Use the data
Reference the byte lengths to ensure your strings fit within database columns, API limits, or protocol constraints.

Common Use Cases

Checking if strings fit within database VARCHAR limits
Calculating API request payload sizes
Measuring byte length of multi-byte Unicode strings
Verifying character counts for SMS or social media post limits

Frequently Asked Questions

Why is byte length different from character length?

In UTF-8 encoding, ASCII characters use 1 byte each, but accented characters use 2 bytes, and emoji or CJK characters use 3-4 bytes. So a 5-character string with emoji could be 15+ bytes.

Which encoding should I care about?

UTF-8 is the most common encoding on the web and in databases. UTF-16 is used internally by JavaScript and Java. Check your application or database documentation to know which applies.

Does it count invisible characters?

Yes, the calculator counts all characters including whitespace, zero-width spaces, and other invisible Unicode characters. Use the Invisible Character Detector tool to identify hidden characters.