What does this tool do?
| Direct answer | Converts hexadecimal to binary by expanding each hex digit to 4 bits. |
| Key fact | F expands to 1111, 0 to 0000 — each digit maps independently. |
| Processing | Runs locally in your browser; no data is sent to a server. |
How to use
- Type a hex number like FF.
- Click Convert.
- See the binary value.
Example
Input
FF
Output
11111111
Who is this for?
This tool was built for people who need a fast answer in the browser — no install, no account, no data leaving the device.
Programmers working with low-level data, computer science students, and electronics hobbyists reading registers — anyone tired of converting number bases by hand.
Frequently asked questions
What is FF in binary?
11111111 — eight 1s, one byte.
Are padded zeros included?
Yes, each hex digit always yields 4 bits.
Negative hex?
The sign is handled; the magnitude is expanded.