Hex ↔ Text Converter

How it is calculated

In encode mode the tool takes your text as bytes and writes each byte as two hexadecimal digits (00 to ff), separated by spaces. It works on the raw bytes of the text, so a plain ASCII letter is one byte, while accented letters, symbols and emoji are written as several bytes (UTF-8 encoding). In decode mode it removes all whitespace from your input, reads the remaining hex digits in pairs and turns them back into characters; if the string contains a non-hex character or an odd number of digits, it reports it as invalid. Output letters are lowercase. This is an encoding, not encryption: anyone can reverse it.

Common mistakes

• Pasting a hex string with an odd number of digits or a stray character such as a 0x prefix or a comma, which makes decoding fail.
• Expecting one pair per character: non-English letters and emoji take two to four bytes in UTF-8.
• Treating hex as a secret code; it hides nothing.
• Confusing hex with decimal byte values or with Base64, which are different encodings.
• Forgetting that uppercase and lowercase letters have different codes (H is 48, h is 68).