What does this tool do?
| Direct answer | Converts a decimal (base-10) integer to hexadecimal (base-16). |
| Key fact | Each hex digit maps to 4 bits, which is why hex is common in memory addresses and colors. |
| Processing | Runs locally in your browser; no data is sent to a server. |
How to use
- Type a decimal number like 255.
- Click Convert.
- See the hex value.
Example
Input
255
Output
FF
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 255 in hex?
FF — the largest value of one byte.
Is the output uppercase?
Yes, digits A-F are uppercase by convention.
Largest supported value?
Integers up to 2^53 − 1 (JS number precision limit).