DEVELOPER TOOLS
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Perfect for debugging and system design.
BINARY (Base 2)
11111111
OCTAL (Base 8)
377
DECIMAL (Base 10)
255
HEXADECIMAL (Base 16)
FF
Common values:
How to Use Number Base Converter
1
Enter your number
Type any number in the input field above. Only valid characters for the selected base are accepted.
2
Select the input base
Click BIN, OCT, DEC or HEX to tell the converter what base your input is in.
3
Read all conversions
All four base representations update instantly as you type.
4
Copy any result
Click the copy icon on any result box to copy that specific value.
Frequently Asked Questions
What is binary and why do computers use it?
Binary is base 2 using only 0 and 1. Computers use binary because electronic circuits naturally represent two states: on (1) and off (0).
What is hexadecimal used for?
Hexadecimal (base 16) is used in programming, color codes, memory addresses and HTML. It represents binary data more compactly than decimal.
How do I convert binary to decimal?
Enter your binary number in the input, select BIN as the input base and the decimal value appears instantly in the DECIMAL result box.
What characters are valid in hexadecimal?
Hexadecimal uses digits 0-9 and letters A-F (or a-f). So FF, 1A3, and 0-255 are all valid hex values.
Is there a maximum number size?
The converter works with standard JavaScript number limits. For very large numbers beyond 2^53 precision may be affected.