How does text to hex conversion work?

Each text character is translated into a numerical code point according to an encoding standard (such as ASCII or UTF-8). That integer is then expressed as one or more two-digit hexadecimal bytes. For example, ASCII 'A' has code point 65, which converts to hex 0x41.

What is the difference between ASCII and UTF-8 hex encoding?

For standard English characters (code points 0–127), ASCII and UTF-8 hex encodings are identical 1-byte values. However, UTF-8 supports over 149,000 international characters, symbols, and emoji using variable-length encodings of 2, 3, or 4 hex bytes per character.

Why do emojis require multiple hex bytes in UTF-8?

Unicode assigns high code points (above U+FFFF) to emoji. In UTF-8, characters above U+FFFF are encoded using a 4-byte prefix sequence (11110xxx 10xxxxxx 10xxxxxx 10xxxxxx). For instance, the rocket emoji (🚀, U+1F680) encodes to the four hex bytes: F0 9F 9A 80.

Which delimiters can I output between hex bytes?

You can choose between space delimiters (48 65 6C 6C 6F), C-style prefix formatting (0x48, 0x65), string escape notation (\x48\x65), or contiguous unspaced hex (48656C6C6F) for cryptographic digests.

Can I inspect character byte tables individually?

Yes. The built-in byte table displays each character, its Unicode code point, decimal index, binary representation, and hexadecimal byte sequence side-by-side.

Is my text input private?

Absolutely. Text conversion runs 100% locally via the browser's native TextEncoder API. Passwords, API tokens, and confidential strings never leave your device.

Text to Hex Converter

Encode plain text, ASCII strings, and multi-byte Unicode into hexadecimal byte representations. Inspect per-character code points, byte tables, and encodings (UTF-8, UTF-16, and Latin-1).

Text / ASCII / Unicode String Input

Try samples:

Encoding:

Format:

Uppercase

Hexadecimal Encoded Bytes (UTF-8)

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48 65 6C 6C 6F

Characters: 5•Encoded bytes: 5•Average bytes/char: 1.00

Character-by-Character Byte Breakdown

Shows each character's Unicode code point and corresponding byte breakdown in UTF-8.

Char	Code Point	Decimal Bytes	Hex Bytes	Byte Count
H	U+0048	72	48	1 byte
e	U+0065	101	65	1 byte
l	U+006C	108	6C	1 byte
l	U+006C	108	6C	1 byte
o	U+006F	111	6F	1 byte

Runs 100% in your browser. Nothing you enter is sent over the network.

Character Encodings and Byte Serialization

Every digital character begins as a Unicode code point (e.g. 'H' is U+0048). When written to memory, disk, or network packets, code points are serialized into bytes by an encoding algorithm:

UTF-8: Variable 1 to 4 bytes per character. 1 byte for English ASCII, 2 bytes for Latin/Greek/Cyrillic, 3 bytes for CJK/Euro, 4 bytes for Emojis.
UTF-16: Fixed 2 bytes for basic multilingual plane, 4 bytes for surrogate pairs.
ISO-8859-1 (Latin-1): Fixed 1 byte per character for Western European scripts. Characters beyond 255 cannot be encoded.

For a full character lookup of standard 7-bit characters, consult our Standard ASCII Table.

Verified Worked Examples

Example 1: ASCII Word "Hello"

Input:"Hello"

→

Result:48 65 6C 6C 6F

5 characters, 5 bytes.

'H' = 72 (0x48)

'e' = 101 (0x65)

'l' = 108 (0x6C)

'o' = 111 (0x6F)

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Example 2: Accented "é" (2 Bytes UTF-8)

Input:"é"

→

Result:C3 A9 (UTF-8) vs E9 (Latin-1)

Demonstrates multi-byte expansion in UTF-8.

Unicode Code Point: U+00E9

UTF-8 binary: 11000011 10101001

Hex: C3 A9

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Example 3: Currency Symbol "€" (3 Bytes)

Input:"€"

→

Result:E2 82 AC

Euro currency sign requires 3 bytes in UTF-8.

Unicode Code Point: U+20AC

UTF-8 binary: 11100010 10000010 10101100

Hex: E2 82 AC

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Example 4: Emoji "😀" (4 Bytes)

Input:"😀"

→

Result:F0 9F 98 80

Supplementary plane character.

Unicode Code Point: U+1F600

UTF-8 binary: 11110000 10011111 10011000 10000000

Hex: F0 9F 98 80

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Frequently Asked Questions

Direct answers to technical and practical questions regarding this tool and base-16 conversion.

How does text convert into hexadecimal?

Computers do not store letters directly; they store numeric code points according to character encodings like ASCII or Unicode. In UTF-8, each character is transformed into a sequence of 1 to 4 bytes (8-bit numbers). Each byte is then written as two hexadecimal digits. For example, ASCII letter "H" has code point 72, which is 0x48 in hexadecimal.

Why does the accented character "é" produce two hex bytes in UTF-8 but only one in Latin-1?

Standard ASCII only covers English letters from 0 to 127 (1 byte). To support global alphabets and symbols while remaining backward-compatible with ASCII, UTF-8 uses variable-length encoding: characters from 128 to 2047 require 2 bytes. The character "é" (U+00E9) is encoded as two bytes in UTF-8: 0xC3 and 0xA9. In ISO-8859-1 (Latin-1), however, "é" fits in a single 8-bit byte as 0xE9.

Why do emojis like 😀 require 4 bytes (8 hex digits)?

Emojis have high Unicode code points above U+FFFF (in Unicode supplementary planes). In UTF-8, characters in the range U+10000 to U+10FFFF require 4 bytes. The grinning emoji 😀 (U+1F600) encodes to four consecutive bytes: 0xF0 0x9F 0x98 0x80.

What is the difference between ASCII and UTF-8?

ASCII is a 7-bit character set defining 128 characters (English alphabet, numbers, punctuation, and control codes). UTF-8 is a modern, variable-length universal encoding capable of representing all 1,114,112 Unicode code points across every human language. ASCII is a strict subset of UTF-8: any valid ASCII file is identically valid in UTF-8.

What delimiter should I use when converting text to hex for programming?

It depends on your language. In C/C++ and Python string literals, use "\x" (e.g. "\x48\x65"). In byte arrays or memory dumps, space-separated or comma-separated "0x" (e.g. "0x48, 0x65") is standard. For URL query strings, percent signs are used ("%48%65").

Related Conversion Tools & Resources

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Decode hexadecimal byte strings to readable text. Features strict byte validation, invalid UTF-8 sequence highlighting, and ASCII support.

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Reference

Standard ASCII Table & Character Reference

Complete ASCII character chart with 7-bit values, hexadecimal codes, decimal values, binary representations, and control character descriptions.

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Reference

Hexadecimal Conversion Chart (0–255)

Complete 0 to 255 hexadecimal lookup chart with decimal, 8-bit binary, octal, and ASCII character equivalents. Filterable and copyable table.

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Sources & Technical References

[1]
IETF RFC 3629: UTF-8 Transformation Format — Internet Engineering Task Force (IETF)
Authoritative specification for variable-length 1-to-4 byte UTF-8 encoding.
[2]
The Unicode Standard Core Specification (Version 16.0) — Unicode Consortium
Defines character code points, code planes, and encoding form mappings.

Technical Verification & Editorial Accountability

Written by Sarah Chen (Embedded Systems Engineer) • Verified by Marcus Brody, PE

Reviewed: 2026-10-02MethodologyEditorial PolicyReport Error