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String Length & Bytes

Count UTF-16 length, code points, and UTF-8 byte size.

Input

 
 
  
 
  
 
 
 
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How it works
 
 
How it works
 
     
  • UTF‑16 length counts 16‑bit code units (str.length).
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  • Code points count uses the spread operator to handle surrogate pairs (e.g., emoji) correctly.
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  • Grapheme clusters (what users perceive as characters) can span multiple code points (e.g., family emojis with ZWJ); not computed here.
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Privacy & Security
 
All counts local.
 
 
 
Accuracy, Limits & Tips
 
No normalization; equivalent composed forms counted separately.
 
 
 
Examples
 
  • "Hello" vs emoji sequences.
 
 
 
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