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Binary, Hex & Decimal Converter

Convert between HEX, DEC, OCT and BIN instantly.

About the Binary, Hex & Decimal Converter

Convert whole numbers of any size between hexadecimal, decimal, octal and binary. It uses arbitrary-precision integers, so very large values stay exact.

How to use

  1. Choose the input base on the right.
  2. Type your number (prefixes like 0x and 0b are fine).
  3. Click Copy on any row.

Frequently asked questions

How do I convert binary to decimal?

Choose BIN as the input base, type the binary number, and read the DEC row. Every other base updates at the same time.

Can it convert very large numbers?

Yes. It uses arbitrary-precision integers, so even very long numbers convert exactly with no rounding.

Can I paste numbers with a 0x or 0b prefix?

Yes. Prefixes like 0x (hex) and 0b (binary), spaces and underscores are ignored.

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Questions? Email [email protected].

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