UTF-8 String Length & Byte Counter
Analyze text to understand the difference between character count and byte size in UTF-8 encoding. Perfect for database limits and API payloads.
📈 Byte Distribution
🔍 Character Details
| Char | Code Point | Bytes | Hex |
|---|---|---|---|
Showing first 50 characters. Enter less text to see all character details.
💡 How to Use This Tool
Analyze your text's UTF-8 encoding structure. Follow these simple steps:
Enter Your Text
Type or paste text into the input area, or load a sample.
View Statistics
See characters, bytes, graphemes, and code points update in real-time.
Check Byte Distribution
See how many 1-byte, 2-byte, 3-byte, and 4-byte characters you have.
Analyze Characters
For short text, view detailed per-character breakdown with hex values.
📖 About UTF-8 String Length & Byte Counter
What is UTF-8 String Length & Byte Counter?
A UTF-8 String Length & Byte Counter is a specialized tool that analyzes text strings to reveal the difference between visible characters and their actual byte representation in UTF-8 encoding. This is crucial for developers working with databases, APIs, and file systems where byte limits matter.
Why Character Count ≠ Byte Count
In UTF-8 encoding, different characters require different numbers of bytes:
- ASCII characters (A-Z, 0-9): 1 byte each
- Latin extended (é, ñ, ü): 2 bytes each
- Asian characters (中, 日, 한): 3 bytes each
- Emojis (😀, 🎉, 👍): 4 bytes each
Key Metrics Explained
Characters (Length)
The number of Unicode characters in the string, which may differ from what you see due to combining characters.
Bytes
The actual storage size when encoded in UTF-8. This is what databases and file systems use for limits.
Graphemes
User-perceived characters. For example, 'é' could be one grapheme but two Unicode characters (e + combining accent).
Code Points
The number of Unicode code points. This represents the raw Unicode values in the string.
Common Use Cases
- Database field sizing: Ensure text fits within VARCHAR byte limits
- API payload validation: Verify JSON strings meet size restrictions
- SMS/Character limits: Calculate actual message costs
- File naming: Check filename byte lengths for compatibility
- Internationalization testing: Validate multi-language support
Privacy & Security
All analysis happens locally in your browser using JavaScript. Your text is never sent to any server, ensuring complete privacy for sensitive content.