Arbitrary-precision integer math powered by native JavaScript BigInt. Add, subtract, multiply, divide, modulo, exponentiate, shift, compute gcd / lcm / modular exponent / factorial, and see the result in binary, octal, decimal, hex, and base64 — all in your browser.
Accepts decimal, 0x hex, 0o octal, 0b binary. Leading - is allowed. Underscores and spaces are ignored.