Number Base Converter
Enter a number and choose its base to see the value in decimal, hex, binary, and octal.
About Number Base Converter
Different number bases are used in programming: decimal for everyday numbers, hexadecimal for memory addresses and colors, binary for bitwise operations, and octal in some file permissions. This tool converts between them instantly in your browser.
Frequently Asked Questions
What number bases are supported?
Decimal (base 10), hexadecimal (base 16), binary (base 2), and octal (base 8). Enter a value and choose which base it is in; the tool shows the equivalent in all four bases.
Is my data sent to a server?
No. All conversion happens in your browser. Nothing is uploaded.
Why does conversion fail for my hex/binary input?
Hex allows 0-9 and A-F (or a-f). Binary allows only 0 and 1. Octal allows 0-7. Remove any spaces or prefixes (like 0x) before converting.