Free Number Base ConverterConvert binary, octal, decimal, and hex instantly with private client-side processing.

What is a number base converter?

A number base converter translates the same integer between different radices—binary for bitmasks, octal for permissions, decimal for everyday math, and hexadecimal for memory addresses and colors.

Enter a value in any field and the other bases update immediately, with clear errors when digits are invalid for that base.

Why convert between bases?

Developers constantly move between bases when debugging flags, reading dumps, or checking bitmask math. Doing it in the browser avoids mental arithmetic mistakes and one-off scripts.

Optional prefixes like 0x for hex are accepted and stripped during conversion.

How to use this converter

1. Type a value in Binary, Octal, Decimal, or Hex.
2. Watch the other fields update automatically.
3. Use Copy next to any field, or load the sample to try it out.

Privacy-first by default

All conversion happens in your browser. No numbers are uploaded, stored remotely, or used for training.

Frequently Asked Questions

What number bases are supported?

This converter supports binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Changing any field updates the other three.

Is conversion done in my browser?

Yes. All conversion runs fully in your browser. Your numbers stay on your device and are never uploaded to a server.

How do I convert hex to decimal?

Type a hexadecimal value in the Hex field (with or without a 0x prefix). The Decimal field updates automatically with the base-10 equivalent.