Number Base Converter
ConvertersConvert numbers between Decimal, Hexadecimal, Octal, and Binary bases. Supports large numbers via BigInt and validates input digits for each base.
All processing happens locally in your browser — your data never leaves your machine.
Loading tool...
Examples
Decimal to all bases
Input
255Output
HEX: FF | OCT: 377 | BIN: 11111111Hexadecimal to Decimal
Input
1A3F (hex)Output
DEC: 6719 | OCT: 15077 | BIN: 1101000111111Binary to Decimal and Hex
Input
11010110 (bin)Output
DEC: 214 | HEX: D6 | OCT: 326Frequently Asked Questions
- What number bases does this converter support?
- This tool supports four common number bases: Decimal (base 10), Hexadecimal (base 16, digits 0-9 and A-F), Octal (base 8, digits 0-7), and Binary (base 2, digits 0 and 1). Enter a number in any base and instantly see it represented in all four.
- How do I convert a hexadecimal number to decimal?
- Select 'Hex' as the input base using the segmented control, then type your hexadecimal value (e.g., 1A3F). The tool will instantly display the equivalent Decimal, Octal, and Binary representations. No prefix like '0x' is needed.
- Can this tool handle very large numbers?
- Yes. For numbers that exceed JavaScript's safe integer limit (2^53 - 1), the converter automatically falls back to BigInt arithmetic, ensuring accurate conversions even for extremely large values.