Number Base Converter

Number Base Converter converts numbers between binary, octal, decimal, hexadecimal, base32, and base64 representations instantly and bidirectionally. It also shows the two's complement (signed) representation for a chosen bit width and flags overflow when a value does not fit in the selected bit length, making it useful for both quick base conversions and understanding how signed integers are actually stored.

Key Features

• Six number bases

  Convert between binary, octal, decimal, hexadecimal, base32, and base64 simultaneously.

• Two's complement view

  See the signed two's complement representation of a value at a chosen bit width (8/16/32/64-bit).

• Overflow detection

  Flags when a value does not fit within the selected bit length for signed representation.

• Grouped binary display

  Binary output is grouped into readable nibbles/bytes rather than one long digit string.

• Large integer support

  Handles arbitrarily large integers via BigInt, not limited to 32/64-bit JS number precision.

1. 1

   Enter a value

   Type a number in any supported base (binary, octal, decimal, hex, base32, or base64).

2. 2

   Read the conversions

   See the same value instantly converted into every other base.

3. 3

   Check the bit representation

   Select a bit width to see the two's complement (signed) representation and check for overflow.

4. 4

   Copy what you need

   Copy any of the converted values for use elsewhere.

Explore these tools that work great alongside Number Base Converter: