String Length Checker

Count characters, words, bytes & more

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About String Length Checker

A comprehensive string analysis tool that counts characters (with and without spaces), words, sentences, paragraphs, and byte size for any text input. Provides detailed Unicode analysis including code points, grapheme clusters (properly counting emojis like 👨‍👩‍👧‍👦 as single characters), and encoding sizes in UTF-8, UTF-16, and ASCII. Includes character frequency histogram, line break analysis, and platform-specific limits (Twitter/X, SMS, meta descriptions). Essential for developers, writers, SEO professionals, and social media managers.

String Length Checker Features

  • Character & word count
  • Byte size (UTF-8/16)
  • Emoji-aware counting
  • Platform limit checks
  • Frequency analysis
How long is your string? It sounds like a simple question, but the answer depends on what you're measuring. A single emoji like 👨‍👩‍👧‍👦 is 1 visual character, but 7 Unicode code points, 25 UTF-8 bytes, and 11 JavaScript .length units. The String Length Checker gives you all these measurements at once — plus word count, sentence count, character frequency, and checks against common platform limits like Twitter's 280 characters and Google's meta description length.

How to Use the String Length Checker

Paste or type any text and get instant analysis:

  • Characters: Total count, with and without spaces
  • Words: Whitespace-delimited word count
  • Sentences: Based on terminal punctuation (.!?)
  • Paragraphs: Based on line breaks
  • Bytes: Size in UTF-8, UTF-16, and ASCII encoding
  • Unicode: Grapheme clusters (visual characters) vs. code points vs. JavaScript .length

All counts update in real time as you type.

Why Different Counts Differ

String length varies by measurement:

  • JavaScript .length: Counts UTF-16 code units. Most characters = 1, but emojis and CJK characters may = 2 (surrogate pairs)
  • Grapheme clusters: What humans perceive as 'one character'. The family emoji 👨‍👩‍👧‍👦 is 1 grapheme cluster but 7 code points joined by ZWJ (zero-width joiner)
  • UTF-8 bytes: ASCII characters = 1 byte, most European characters = 2 bytes, CJK = 3 bytes, emojis = 4 bytes each

This tool shows all three so you can pick the right measurement for your use case.

Platform Character Limits

Common character limits to check against:

  • Twitter/X: 280 characters
  • SMS: 160 characters (GSM-7) or 70 (Unicode)
  • Meta description: ~155-160 characters for Google SERPs
  • Meta title: ~50-60 characters
  • Instagram caption: 2,200 characters
  • YouTube title: 100 characters
  • URL slug: Recommended under 60 characters

The tool highlights when your text exceeds these limits.

Step-by-Step Instructions

  1. 1Type or paste your text into the input area.
  2. 2View real-time counts for characters, words, sentences, and paragraphs.
  3. 3Check byte sizes in UTF-8 and UTF-16 for technical applications.
  4. 4Review platform limit indicators to ensure your text fits Twitter, SMS, or SEO requirements.
  5. 5Explore the character frequency breakdown for text analysis.

String Length Checker — Frequently Asked Questions

Why does JavaScript report a different length than the visual character count?+

JavaScript's .length property counts UTF-16 code units, not visual characters. Emojis, many CJK characters, and mathematical symbols use 'surrogate pairs' (2 code units per character), so '😀'.length = 2 even though it's visually one character. This tool shows the grapheme cluster count, which matches what humans see.

How are words counted?+

Words are counted by splitting on whitespace (spaces, tabs, newlines) and filtering out empty strings. This means hyphenated words like 'well-known' count as one word, and multiple consecutive spaces don't create phantom words. This matches the word count method used by most text editors.

What's the difference between UTF-8 and UTF-16 byte counts?+

UTF-8 uses 1-4 bytes per character (efficient for ASCII-heavy text), while UTF-16 uses 2-4 bytes (efficient for CJK-heavy text). ASCII text is roughly half the size in UTF-8 vs UTF-16. JavaScript strings are internally UTF-16, while most web transmission uses UTF-8.

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