How to use the hex converter
A hex converter turns numbers between hex, decimal, binary and octal, so you don’t have to work it out by hand. Paste in what you have, pick what you want it turned into, and the box above does the rest, no matter how large the number is.
- Type or paste your value into the box above — hex, decimal, binary, or plain text.
- Choose what you want to convert it to.
- Copy the result from the box above. It updates as you type.
Why convert hex to decimal or decimal to binary
- You’re reading a colour code or a memory address in hex and need the decimal value to make sense of it.
- You’re a student or developer doing decimal to binary for an assignment or a low-level programming task.
- You’re checking a network setting, like a subnet mask, that’s easier to read in binary than decimal.
- You want decimal to hex for a code, a colour, or a config file, without working out the maths yourself.
Numbers of any size, plus Roman numerals, text to binary and Base64
Besides hex, decimal, binary and octal, the box above also converts Roman numerals, turns text to binary and back, and handles Base64 encoding and decoding. It works with numbers of any size, so you’re not limited to what fits in a normal calculator.
What you get
Everything runs in your browser, on our own servers. There’s no account to make and no watermark on the result. If you upload a file, it’s deleted within an hour.
Questions people ask
What is a hex converter?
A hex converter changes numbers between hexadecimal and other number systems — decimal, binary and octal — so you can read or use a value in the format you need.
How do I convert hex to decimal?
Paste the hex value into the box above and choose decimal as the result. It works for hex numbers of any length.
How do I convert decimal to binary?
Enter the decimal number in the box above and pick binary. The conversion happens as you type, with no extra steps.
Can I convert binary to decimal too?
Yes. The same box above reads binary input and gives you the decimal, hex or octal value, whichever you need.
Does the hex converter handle Roman numerals and Base64?
Yes. Besides number bases, it converts Roman numerals, text to binary and back, and Base64 encoding and decoding.
Is it free, and do I need an account?
It’s free, with no account and no watermark. Anything you upload is deleted within an hour, and the conversion runs on our own servers.
Updated 24 September 2026.