Hex Encoder

A Hex Encoder converts plain text into its hexadecimal representation by mapping each character to its corresponding hex byte value. Every character in a string has an ASCII or Unicode code point, and this tool expresses those code points as two-digit (or more) hexadecimal values — for example, the letter 'A' becomes '41' and a space becomes '20'. The result is a compact, human-readable encoding widely understood across programming languages, protocols, and hardware interfaces.

For developers, hex encoding is an essential technique when working close to the data layer. It lets you inspect raw byte values, encode binary-safe strings for transmission, embed data in source code, or debug character encoding issues. Unlike formats such as Base64, hex output has a direct one-to-one relationship with byte values, making it far easier to read and verify individual characters during low-level debugging or protocol analysis.

Using the tool is straightforward: paste or type your input text into the source field and the hex-encoded output is generated instantly. Each character in your input is converted to its UTF-8 byte sequence, and each byte is represented as a two-character hexadecimal value (00–FF). By default, byte values are space-separated for readability, though you may also see continuous output depending on your chosen format option. For example, the string 'hello' produces '68 65 6c 6c 6f'.

It is important to understand how multi-byte characters are handled. Standard ASCII characters (code points 0–127) map to a single hex byte each. However, characters outside the ASCII range — such as accented letters, emoji, or CJK characters — are encoded as multiple bytes in UTF-8, so a single character may expand to two, three, or four hex byte pairs. If you need to decode hex back into readable text, use the companion Hex Decoder tool.

Edge cases to keep in mind: leading and trailing whitespace in your input will be encoded as hex bytes just like any other character, so trim your input first if that is not intended. Empty input produces empty output. Very large inputs are processed entirely in the browser — no data is sent to any server — but performance may vary on extremely long strings.