🔢 Binary/Hex/Decimal Calculator & ASCII Table

1. Pick the input base (Decimal, Binary, Hex, Octal, or Other base for anything from 2 to 36).
2. Type the number. Prefixes 0x / 0b / 0o, spaces and underscores are accepted as grouping and stripped automatically. Commas group digits too; in decimal only as thousands separators (1,000,000), so 3,14 is refused rather than read as 314.
3. Results update as you type (or click Convert). A step-by-step explanation appears below for numbers up to 256 bits.
4. For a signed interpretation, tick Signed integer (two's complement) and choose a bit width. A hex or binary pattern such as FF at 8 bits is also read as its signed value (−1).
5. Use Binary Arithmetic for add / subtract / multiply / divide (exact, any size) and AND / OR / XOR / shifts (at the chosen bit width; each number must fit that width). >> keeps the sign like C, Java and Python; >>> fills with zeros.

Accuracy & limits: all math uses arbitrary-precision integers (BigInt), so conversions are exact at any size — a 256-bit hex value converts to its exact decimal. Negative numbers use signed magnitude unless you enable two's complement at a chosen bit width. This tool handles integers only (no fractions). Only ASCII digits and letters count as digits: look-alikes such as ß or full-width digits are refused, never reinterpreted. Everything runs in your browser; nothing is sent anywhere.