String Length Calculator
Calculate string length and basic text metrics.
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Calculate string length and basic text metrics.
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Tool guide
Free String Length Calculator
Calculate JavaScript string length alongside Unicode code points, characters without whitespace, words, lines, and UTF-8 bytes. The side-by-side metrics clarify why emoji and other supplementary characters may have different code-unit and code-point totals.
Steps
How it works
- Paste the string or multiline text to measure.
- Run the string length calculator in your browser.
- Compare UTF-16 length, Unicode code points, words, lines, and bytes.
- Copy the summary or download it as a TXT file.
Highlights
Key features
- Reports JavaScript text.length as UTF-16 code units.
- Separately counts Unicode code points with Array.from.
- Shows length after removing all whitespace.
- Counts words and lines with practical text rules.
- Calculates the UTF-8 encoded byte length.
Use cases
Common uses
- Check a string against a JavaScript length condition.
- Compare UTF-16 code units with Unicode code points.
- Estimate storage or request size in UTF-8 bytes.
- Inspect words and lines in test strings or API values.
Notes
Limitations to know
- Unicode code points are not the same as user-perceived grapheme clusters.
- Joined emoji, flags, skin-tone sequences, and combining characters can still represent one visible symbol with multiple code points.
- Word counting is practical rather than language-specific.
- Line breaks count toward JavaScript string length and split the line total.
- The tool does not validate programming-language string literals or include hidden escape decoding.
FAQ
Frequently asked questions
Is this JavaScript string length?
The Characters value uses JavaScript string.length, which counts UTF-16 code units.
How are emoji counted?
Many emoji use two UTF-16 code units. Complex visible emoji can also contain multiple Unicode code points.
Are spaces and line breaks included?
Yes. They count toward Characters and UTF-8 bytes. A separate value removes all whitespace.
What is the difference from Character Counter?
String Length Calculator emphasizes UTF-16 length, code points, words, lines, and bytes; Character Counter breaks text into letters, numbers, symbols, and whitespace.
Does it count visible grapheme clusters?
No. It reports UTF-16 code units and Unicode code points, not grapheme-cluster segmentation.