ASCII to Binary Converter
Convert standard ASCII text into 8-bit binary byte tokens. Enter text to get an instant character-by-character view of its decimal, hexadecimal, and binary codes.
Frequently Asked Questions
How do I convert ASCII text to binary?
Find each character's ASCII number and write it in base 2 as an eight-bit byte. For example, A is decimal 65 and binary 01000001.
What does Hello look like in binary?
Hello becomes 01001000 01100101 01101100 01101100 01101111 in standard ASCII binary.
Why are binary bytes padded to eight bits?
Leading zeroes make every value a full byte, which is easier to read and aligns with common computer storage.
Does each ASCII character use one byte?
Yes. Standard ASCII values fit in seven bits and are conventionally 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 binary the same as UTF-8 binary?
They match for ASCII characters only. UTF-8 uses multiple bytes for characters outside the ASCII range.
What is binary 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 binary byte sequence on your clipboard.
Convert standard ASCII text into eight-bit binary byte tokens. Each character receives one padded binary value, so Hello becomes 01001000 01100101 01101100 01101100 01101111.
How to convert ASCII to binary
How to convert ASCII A to binary 01000001
Enter A to produce 01000001. The leading zero keeps the decimal ASCII value 65 in an eight-bit byte.
How to convert Hello to binary bytes
Enter Hello and copy the five resulting byte groups. Each group belongs to exactly one ASCII character.
How to include spaces in a binary payload
Spaces are preserved as 00100000. For example, A B produces two consecutive 00100000 byte groups.
How to prepare an eight-bit binary test payload
Use the output when a serial monitor, emulator, packet test, or embedded target expects binary byte values rather than text.
Common use cases
- Prepare binary payloads for CTF challenges and educational exercises.
- Construct raw test data for HTTP, TCP, serial, or other low-level protocol debugging.
- Compare an intended text value with a memory dump or binary dump.
- Validate that an ASCII command or identifier has the expected byte representation.
- Prepare fixed messages and test vectors for embedded firmware or microcontrollers.
Why binary values use eight bits
ASCII values run from 0 to 127 and fit in seven bits. Writing a leading zero produces a consistent eight-bit byte, which matches the way text bytes are commonly displayed and stored. The padding makes byte boundaries clear when you inspect or transmit a payload.
When to use this vs binary-translator
This converter is single-direction, strict, and ASCII-only (0–127): every ASCII character becomes one eight-bit binary token, while non-ASCII characters are shown as Unicode code points. Binary Translator is a bidirectional convenience tool that treats each 8-bit group as one JavaScript charCode. It works well for basic single-byte content but does not decode UTF-8 multi-byte sequences.
What is the binary value of common ASCII characters?
| Character | Binary | Decimal |
|---|---|---|
A | 01000001 | 65 |
a | 01100001 | 97 |
0 | 00110000 | 48 |
| space | 00100000 | 32 |
! | 00100001 | 33 |
? | 00111111 | 63 |