Converters
Number base converter
Binary, octal, decimal, hex and base 2–36.
- Instant
- Free
- Private (processed locally)
- No sign-up
Convert a number
Enter a value and its input base: the tool shows binary, octal, decimal, hex, plus a base of your choice.
Example
| Base | Value |
|---|---|
| Decimal | 255 |
| Binary | 11111111 |
| Octal | 377 |
| Hexadecimal | FF |
Big numbers (BigInt), 100% local.
Frequently asked questions
What is the maximum base?
Base 36, which uses digits 0–9 then letters A–Z.
Does it handle big numbers?
Yes, via BigInt, with no precision loss even for very large values.
What about negatives?
Yes, add a “−” sign in front of the value.