Number Base Converter
Convert a number between decimal, hex, octal and binary.
Results appear as you type
Everything runs locally in your browser — your input never leaves this page.
About the Number Base Converter
The Number Base Converter translates a single value between decimal, hexadecimal, octal and binary in one place. Type a number in any base and the other three representations update instantly, so you can read a hex color, decode a binary flag, or check an octal file permission without reaching for a calculator. Everything is computed client-side in your browser, so the numbers you enter never leave your machine.
How to use
- Pick the base of the number you already have (decimal, hex, octal or binary).
- Type or paste the value into that field.
- Read the equivalent value in the other three bases as they update automatically.
- Copy whichever representation you need into your code or terminal.
Frequently asked questions
- Which bases are supported?
- Base 10 (decimal), base 16 (hexadecimal), base 8 (octal) and base 2 (binary), with conversions running in every direction.
- Do I need to add a prefix like 0x or 0b?
- No. Just enter the raw digits in the matching field; the converter already knows the base, so prefixes are optional.
- Can it handle large numbers?
- Yes, it handles standard integer values well. Very large numbers may be limited by JavaScript number precision, so treat extremely large inputs with care.