ASCII to Hex Converter
Convert standard ASCII text into uppercase hexadecimal byte tokens. Enter text to get an instant character-by-character view of its decimal, hex, and binary codes.
Frequently Asked Questions
How do I convert ASCII text to hex?
Each ASCII character has a number from 0 to 127. Convert that number to base 16; for example, A is 65 in decimal and 41 in hexadecimal.
What does Hello look like in hex?
Hello becomes 48 65 6C 6C 6F when each ASCII character is written as a two-digit hexadecimal byte.
Why are the hexadecimal bytes uppercase?
Uppercase A–F is a common, readable convention for hexadecimal notation. The numeric values are identical to lowercase hex.
Does each ASCII character use one byte?
Yes. Standard ASCII values fit in seven bits and are normally stored in one eight-bit byte.
What happens to accented letters or emoji?
They are not ASCII. The converter shows their Unicode code-point notation and points you to the ASCII Converter for Unicode handling.
Is ASCII to hex the same as UTF-8 text to hex?
They match for ASCII characters only. UTF-8 uses multiple bytes for characters outside the ASCII range.
What is the hex value for a space?
A space is decimal 32, hexadecimal 20, and binary 00100000.
Can I copy the converted result?
Yes. Use the copy button beside the result to put the hexadecimal byte sequence on your clipboard.
Convert standard ASCII text into uppercase hexadecimal bytes. Each ASCII character becomes one two-digit byte, so Hello becomes 48 65 6C 6C 6F.
How to convert ASCII to hex
How to convert ASCII A to hex 41
Enter A to produce 41. The ASCII code for uppercase A is decimal 65, written as 41 in hexadecimal.
How to convert Hello to hexadecimal bytes
Enter Hello and copy 48 65 6C 6C 6F. Each two-digit token represents one ASCII character.
How to include spaces in an ASCII hex payload
Spaces are bytes too: A B becomes 41 20 20 42. Consecutive spaces stay as separate 20 tokens.
How to prepare a hexadecimal test payload
Type the exact ASCII command or header value you need. The result can be pasted into a packet tester, serial console, or debugger that accepts hex bytes.
Common use cases
- Prepare ASCII payloads for CTF challenges and protocol exercises.
- Build raw HTTP, TCP, serial, or other low-level test payloads.
- Compare a known text value with a memory dump or hex dump.
- Validate the byte-level form of an ASCII command, header, or identifier.
- Prepare fixed strings for embedded firmware, EEPROM, or microcontroller tests.
Why ASCII maps neatly to hex
ASCII assigns each character a value from 0 to 127. Hexadecimal is a compact way to write those values: A is decimal 65 and hex 41; a space is decimal 32 and hex 20. The output keeps one visible byte token per ASCII character.
When to use this vs hex-to-text
Use this converter when the source text is limited to 7-bit ASCII and you need one hex byte per character. It exposes non-ASCII input as Unicode code points instead of inventing bytes for it. Use Hex to Text for UTF-8 encoding, where accented letters, CJK text, and emoji can require multiple bytes. Hex to Text is therefore the right tool for general Unicode text.
What is the hex value of common ASCII characters?
| Character | Hex | Decimal |
|---|---|---|
A | 41 | 65 |
a | 61 | 97 |
0 | 30 | 48 |
| space | 20 | 32 |
! | 21 | 33 |
? | 3F | 63 |