8-Bit Hex to Binary Converter
Convert any hexadecimal value that fits in one 8-bit byte into exactly eight binary digits. Enter values from 00 through FF, including 0A, 7F, 80, A5 or FF, and preserve all required leading zero bits.
8-Bit Hex to Binary Converter
The 8-Bit Hex to Binary Converter converts a hexadecimal value into exactly eight binary digits. Eight bits equal one byte, so this tool is designed specifically for hexadecimal values that fit inside a single byte.
Unlike a normal variable-width hexadecimal converter, leading binary zeros are preserved automatically because the target width is fixed at eight bits.
What Is an 8-Bit Hexadecimal Value?
Eight binary bits can represent 256 distinct bit patterns. In hexadecimal, those patterns range from 00 through FF.
Each 8-bit value consists of two 4-bit nibbles, and each nibble corresponds to one hexadecimal digit.
How to Convert 8-Bit Hex to Binary
Convert each hexadecimal digit into four binary bits. If the input contains only one hexadecimal digit, add a zero nibble on the left so the final output still contains eight bits.
8-Bit Hex to Binary Examples
| Hex | 8-Bit Binary | Number of Bits |
|---|---|---|
| 00 | 00000000 | 8 |
| 01 | 00000001 | 8 |
| 0A | 00001010 | 8 |
| 0F | 00001111 | 8 |
| 10 | 00010000 | 8 |
| 2A | 00101010 | 8 |
| 7F | 01111111 | 8 |
| 80 | 10000000 | 8 |
| A5 | 10100101 | 8 |
| FF | 11111111 | 8 |
Example: Convert 0A Hex to 8-Bit Binary
The four leading zero bits are part of the required 8-bit result and should not be removed.
Example: Convert A5 Hex to 8-Bit Binary
Both hexadecimal digits contribute exactly four bits, giving one complete 8-bit byte.
Example: Convert FF Hex to 8 Bits
FF is the largest possible raw hexadecimal pattern that fits inside eight bits.
Why 8-Bit Binary Always Contains Eight Digits
A fixed-width representation describes storage layout, not only numerical magnitude. Therefore binary padding is required even when the numerical value could be written using fewer bits.
| Hex | Minimal Binary | 8-Bit Binary |
|---|---|---|
| 1 | 1 | 00000001 |
| A | 1010 | 00001010 |
| 10 | 10000 | 00010000 |
| 2A | 101010 | 00101010 |
| 80 | 10000000 | 10000000 |
One Hex Digit vs Two Hex Digits
One hexadecimal digit contains four bits, while two hexadecimal digits contain eight bits.
The converter therefore accepts a one-digit value and automatically extends it to the required one-byte width.
Why Hex 100 Is Not an 8-Bit Value
Hexadecimal 100 is one greater than FF and requires nine significant binary bits.
The calculator rejects 100 instead of truncating its highest bit, because truncation would change the value.
8-Bit Hex Range
Because eight bits provide 256 distinct bit patterns, the raw hexadecimal range is:
The calculator itself focuses on the raw fixed-width conversion rather than assigning signed or unsigned meaning to that pattern.
8-Bit Hex Does Not Automatically Mean Signed or Unsigned
An 8-bit pattern is simply eight bits. Its numerical interpretation depends on the data type or encoding used elsewhere.
| Hex | 8-Bit Binary | Unsigned Meaning | Signed Two’s Complement Meaning |
|---|---|---|---|
| 7F | 01111111 | 127 | 127 |
| 80 | 10000000 | 128 | -128 |
| FF | 11111111 | 255 | -1 |
This page only produces the exact 8-bit pattern. Dedicated UInt8 and Int8 tools later apply those specific numerical interpretations.
8-Bit Hex vs Hex Byte Converter
Both involve one byte, but this page is specifically optimized around an 8-bit fixed-width output requirement. A value such as A is accepted and padded to 00001010 because the requested target is explicitly eight bits.
Leading Zeros Are Significant in Fixed-Width Output
When a system expects one complete byte, leading zeros are placeholders for unused high-order bit positions and must remain visible.
Removing the five leading zeros would lose the fixed-width presentation.
High Nibble and Low Nibble
An 8-bit byte can be divided into two four-bit nibbles. The first hexadecimal digit represents the high nibble and the second represents the low nibble.
Optional 0x Prefix
For convenience, one optional hexadecimal 0x or 0X prefix is accepted. The prefix identifies the base but contributes no binary bits.
Uppercase and Lowercase Hex
Hexadecimal letters are case-insensitive. Uppercase A–F and lowercase a–f represent the same values.
The calculator normalizes hexadecimal letters to uppercase when showing the processed input.
Common Uses for 8-Bit Hexadecimal
- Single-byte values.
- 8-bit microcontroller registers.
- Raw file bytes.
- Network packet bytes.
- Binary protocol fields.
- Color and image byte components.
- Character encoding bytes.
- Hardware status registers.
- Embedded-system debugging.
- Computer architecture exercises.
Common 8-Bit Hex Conversion Mistakes
- Removing leading zeros from an 8-bit result.
- Trying to fit hexadecimal 100 or larger into one byte.
- Assuming the highest bit automatically means the value is negative.
- Treating 0x as part of the hexadecimal byte.
- Writing fewer than eight output bits for a fixed-width requirement.
- Confusing a one-byte bit pattern with an Int8 or UInt8 interpretation.
- Reversing the two hexadecimal nibbles.
- Applying endian conversion to a single byte where byte order is irrelevant.
8-Bit Hex to Binary Converter FAQs
What is A hex in 8-bit binary?
What is 0A in 8-bit binary?
What is FF in 8-bit binary?
What is 80 in 8-bit binary?
What is the largest 8-bit hexadecimal value?
Why is the result always eight bits?
Can I enter a single hex digit?
Can I enter 100?
Can I enter 0xFF?
Does FF mean -1 or 255 here?
Are lowercase hexadecimal letters supported?
Does byte order matter for an 8-bit value?
Convert Hex to Exact 8-Bit Binary
Enter a hexadecimal value from 0 through FF above and select Convert to 8-Bit Binary. The tool validates that the value fits inside one byte, converts it directly to binary and pads the left side with zeros whenever necessary so the final output always contains exactly eight bits.