UTF-8 Encoder and Decoder
Convert text to UTF-8 byte sequences in hex, binary, or decimal formats, or decode UTF-8 bytes back to readable text. This tool ensures proper character encoding for internationalization and data processing.
How it works
This tool encodes text to UTF-8 byte sequences and decodes UTF-8 bytes back to readable text. UTF-8 is the dominant character encoding for the web, supporting all Unicode characters.
The encoder converts each character to its UTF-8 byte representation, showing results in hexadecimal, binary, or decimal formats. ASCII characters (0-127) encode as single bytes, while other characters use 2-4 bytes depending on their code point.
UTF-8 encoding examples:
Aencodes to 0x41 (1 byte)€encodes to 0xE2 0x82 0xAC (3 bytes)😀encodes to 0xF0 0x9F 0x98 0x80 (4 bytes)Type text to encode or paste hex bytes to decode. The tool validates UTF-8 sequences and shows results in multiple formats for copying.
When you'd actually use this
Debugging character encoding issues
A developer sees garbled text in their application. They encode the expected text to UTF-8 hex and compare against the actual bytes to find where encoding went wrong.
Creating byte arrays for code
A programmer needs a byte array containing specific Unicode text. They encode to UTF-8 hex and format as {0x48, 0x65, ...} for their C or Rust code.
Analyzing network protocol data
A network engineer inspects packet captures with text payloads. They decode UTF-8 hex dumps to read the actual message content being transmitted.
Testing internationalization
A QA engineer verifies their app handles all languages correctly. They encode test strings in various scripts to UTF-8 and verify the byte lengths match expectations.
Working with binary file formats
A reverse engineer examines file formats that store strings as UTF-8. They decode hex dumps to extract text content from binary files for analysis.
Implementing custom serialization
A backend engineer writes a protocol that serializes strings as UTF-8 with length prefix. They use this tool to verify their encoding matches the specification.
What to know before using it
UTF-8 is variable-length.ASCII uses 1 byte, European characters often use 2, Asian characters use 3, and emoji use 4 bytes. String length in bytes differs from character count.
Invalid UTF-8 sequences exist.Not all byte sequences are valid UTF-8. The tool validates and rejects malformed sequences like incomplete multi-byte characters or overlong encodings.
BOM is optional in UTF-8.Some systems add a Byte Order Mark (0xEF 0xBB 0xBF) at the start. UTF-8 doesn't need it, but Windows sometimes adds it. The tool handles BOM detection.
Hex input accepts various formats.You can paste "E282AC", "E2 82 AC", "0xE2 0x82 0xAC", or "\xE2\x82\xAC". The tool parses all common hex formats.
Security note: UTF-8 validation is important for security. Invalid UTF-8 can bypass filters that assume valid encoding. Always validate input at trust boundaries.
Common questions
Why does UTF-8 use different byte counts?
UTF-8 is designed to be backward compatible with ASCII. Common characters (ASCII) use 1 byte. Less common characters use more bytes. This optimizes space for English text while supporting all Unicode.
How do I know if text is valid UTF-8?
Paste the hex bytes into this tool. If it decodes successfully, it's valid UTF-8. If it shows an error, the bytes don't form valid UTF-8 sequences.
What's the difference between UTF-8 and ASCII?
ASCII is a subset of UTF-8. Bytes 0-127 mean the same thing in both. UTF-8 extends ASCII to support all Unicode characters using multi-byte sequences.
Can I encode emoji to UTF-8?
Yes, emoji encode as 4-byte UTF-8 sequences. 😀 becomes 0xF0 0x9F 0x98 0x80. All Unicode characters including emoji have valid UTF-8 encodings.
How do I convert UTF-8 to other encodings?
This tool handles UTF-8 specifically. For other encodings like UTF-16 or Latin-1, use dedicated converters or iconv command-line tool.
What is a UTF-8 code point?
A code point is the Unicode number for a character (like U+0041 for 'A'). UTF-8 encodes code points into bytes. The code point is the abstract character, UTF-8 is one way to encode it.
Why use hex format for UTF-8?
Hex is compact and readable for binary data. Each byte is two hex digits. It's easier to work with than decimal or binary for most programming tasks.
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