UTF-8 Encoder

Convert text strings into their UTF-8 byte representations (Hex, Binary, or Decimal).

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UTF-8 Encoder
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About UTF-8 Encoder

This UTF-8 Encoder tool converts plain text into its UTF-8 (Unicode Transformation Format - 8-bit) byte sequence. UTF-8 is the dominant character encoding for the World Wide Web and can represent any character in the Unicode standard. This tool displays the resulting UTF-8 bytes in your choice of Hexadecimal, Binary, or Decimal format.

For example, the Euro symbol (€) which is Unicode character U+20AC, is represented in UTF-8 as three bytes: E2 82 AC (Hex), or 226 130 172 (Decimal).

How to Use This Tool

  • Enter or paste the text you want to encode into the "Enter Text" input area.
  • Select the desired "Output Format for UTF-8 Bytes" (Hexadecimal, Binary, or Decimal).
  • Choose a "Separator Between Bytes" (Space, Comma, Newline, None, or a Custom string).
  • Optionally, enter a "Prefix for Each Byte" (e.g., "0x" for hex, "%" for URL-style hex).
  • If Hexadecimal output is selected, choose the desired "Hexadecimal Case" (Uppercase or Lowercase).
  • The UTF-8 encoded byte sequence will appear in the output area automatically as you type or change options. You can also click the "Encode to UTF-8" button.

All encoding is performed client-side in your browser using the built-in TextEncoder API for accuracy and speed.

Frequently Asked Questions

What is UTF-8 Encoding?

UTF-8 is a variable-width character encoding capable of encoding all 1,112,064 valid character code points in Unicode using one to four 8-bit bytes. It's designed for backward compatibility with ASCII and is the most common character encoding on the internet.

Why would I need to encode text to UTF-8 bytes?

Understanding UTF-8 byte sequences is useful for web development (e.g., debugging character display issues), data transmission, file format analysis, and when working with systems that require specific byte representations of text.

How are different characters represented in UTF-8?

  • Characters U+0000 to U+007F (standard ASCII) use 1 byte: 0xxxxxxx.
  • Characters U+0080 to U+07FF use 2 bytes: 110xxxxx 10xxxxxx.
  • Characters U+0800 to U+FFFF use 3 bytes: 1110xxxx 10xxxxxx 10xxxxxx.
  • Characters U+10000 to U+10FFFF use 4 bytes: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx.

This tool correctly handles multi-byte characters.

Is my input text sent to a server for encoding?

No. All text encoding to UTF-8 is performed locally in your web browser using JavaScript's built-in TextEncoder API. Your input data is never transmitted to any external server.

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