UTF-8 Encoder & Decoder

Convert text to UTF-8 byte sequences and decode UTF-8 bytes back to text. Essential for internationalization.

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UTF-8 Encoding Reference

UTF-8 (8-bit Unicode Transformation Format) is a variable-width character encoding capable of encoding all 1,112,064 valid Unicode code points using one to four one-byte (8-bit) code units.

Code Point Range Bytes Byte 1 Byte 2 Byte 3 Byte 4 Example
U+0000 to U+007F 1 0xxxxxxx A (U+0041) → 41
U+0080 to U+07FF 2 110xxxxx 10xxxxxx é (U+00E9) → C3 A9
U+0800 to U+FFFF 3 1110xxxx 10xxxxxx 10xxxxxx 中 (U+4E2D) → E4 B8 AD
U+10000 to U+10FFFF 4 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx ? (U+1F60A) → F0 9F 98 8A

Note: UTF-8 is the dominant character encoding for the World Wide Web, accounting for 98% of all web pages as of 2024. Its design allows for backward compatibility with ASCII and avoids byte-order issues.

About UTF-8 Encoding

UTF-8 is a variable-length character encoding that represents each Unicode character with one to four bytes. Developed in 1992 by Ken Thompson and Rob Pike, it has become the standard encoding for the web and modern software due to its efficiency and compatibility.

Technical Note: UTF-8 preserves all ASCII characters in their single-byte form, making it backward compatible with ASCII. Non-ASCII characters are represented using multi-byte sequences.

How to Use This Tool

1

Choose between encoding (text to UTF-8 bytes) or decoding (UTF-8 bytes to text) using the tabs.

2

For encoding: Enter your text and adjust formatting options.

For decoding: Enter UTF-8 byte sequence (hexadecimal) and adjust decoding options.

3

Click the convert button or let the real-time conversion do the work.

4

Copy your result using the copy button.

Common Uses of UTF-8

  • Web development and internationalization
  • Data storage and transfer
  • Multi-language support in applications
  • Database systems and file formats
  • Email and messaging systems
  • Operating systems and programming languages

UTF-8 Advantages

  • Backward compatibility: ASCII characters are identical in UTF-8
  • Efficiency: Uses 1-4 bytes per character as needed
  • Self-synchronizing: Byte sequences are easily identifiable
  • No byte order issues: Eliminates BOM (Byte Order Mark) problems
  • Universal support: Supported by all modern systems and browsers

Technical Example: The character "中" (Chinese for "middle") has the Unicode code point U+4E2D. In UTF-8, it is encoded as three bytes: E4 B8 AD.

Developer Tips

  • Always specify UTF-8 encoding in your HTML meta tags
  • Use UTF-8 for all text storage and transmission
  • Validate UTF-8 input to prevent encoding issues
  • Test your application with multi-byte characters
  • Remember that UTF-8 characters can be 1-4 bytes long