Exact integer conversion
The converter parses the input as a BigInt, so supported whole integers are not rounded through floating-point arithmetic.
Valid digits depend on the base
Binary accepts 0–1, octal 0–7, decimal 0–9, and hexadecimal 0–9 plus A–F. Invalid digits are rejected.
Arithmetic is separate
Use the Binary / Octal / Decimal / Hex Calculator when you want to add, subtract, multiply, or divide values rather than only convert them.
Frequently asked questions
Does conversion happen in my browser?
Yes. These value conversions run in the browser and do not require an account.
Should I verify a critical conversion?
Yes. For engineering, laboratory, medical, financial, legal, or safety-critical work, verify the unit definition and result against an authoritative standard for your context.