Count characters, bytes and words

Report UTF-16 units, Unicode code points, UTF-8 bytes, whitespace tokens, and physical lines separately.

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ToolString Length
Input
Output
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Preview

How it works

JavaScript length measures UTF-16 code units, iteration measures code points, and TextEncoder supplies RFC 3629 byte length. Words split on whitespace and lines split on LF with an optional preceding CR; a non-empty string starts with one line.

  • All units remain visible because a database, API, and UI may enforce different size limits.
  • Unicode UAX #29 grapheme clusters are not counted, so a displayed symbol can contain several reported code points.

Worked example

Measure a plain ASCII string
For ASCII text, characters, code points, and bytes all match
Input
											Hello, World!
Output
												Characters (UTF-16): 13
Code points: 13
Bytes (UTF-8): 13
Words: 2
Lines: 1

When to use this

Database checks compare storage bytes with field limits, API clients diagnose emoji length mismatches, and import fixtures verify CRLF or LF line counts.

Edge cases

  • 😀 measures two UTF-16 units, one code point, and four UTF-8 bytes.
  • e plus a combining acute accent measures two code points despite rendering as one accented grapheme.
  • Chinese prose with no spaces is one whitespace token regardless of its linguistic word boundaries.

References