Number Base Converter
Convert an integer from any base (2 to 36) into binary, octal, decimal, and hexadecimal at once. Backed by BigInt for arbitrary precision.
Private by architecture:
All processing is 100% client-side memory. Your data never leaves this browser tab.
Input Value
Quick Number Presets
Converted Radix Outputs
About This Tool
Parses an integer in any base from 2 to 36 and renders it simultaneously across binary, octal, decimal, and hexadecimal formats. Conversions run via JavaScript BigInt using exact digit place-value math, guaranteeing precision far past standard 64-bit float limits (Number.MAX_SAFE_INTEGER).
Input digits are validated in real time against the selected base. Characters outside the allowed alphabet are highlighted immediately rather than silently failing.
Key Features
- Four simultaneous outputs: Binary, octal, decimal, and hex outputs calculate together from a single input.
- Any base 2 to 36: Select standard radixes or choose any custom base between 2 and 36.
- Arbitrary precision: Engineered with BigInt so 64-bit and 128-bit numbers convert without precision rounding.
- Signed integer support: Negative values with leading minus signs are parsed and represented across all bases.
- Real-time validation: Flags invalid characters instantly according to selected base rules.
- 1-Click copy: Individual copy buttons for each converted radix format.
Frequently Asked Questions
Why does this tool handle large numbers that break other online converters?
Standard JavaScript numbers use 64-bit IEEE 754 floating-point values, which lose precision past 9,007,199,254,740,991 (Number.MAX_SAFE_INTEGER). This calculator uses native BigInt arbitrary-precision arithmetic to convert arbitrarily huge integers without rounding.
How does custom base conversion (radix 2 to 36) work?
Digits 0 through 9 represent values 0 to 9, and letters A through Z represent values 10 through 35. Case is insensitive during input parsing.
Can I convert negative integers?
Yes. Enter a leading minus sign (e.g. -255 or -FF) and each converted output will retain its negative sign.
How are fractional or floating-point numbers handled?
This tool is specialized for exact integer conversion. Fractional or decimal point inputs are rejected to preserve strict Bit/BigInt mathematical integrity.
Is any calculation executed on a remote server?
No. All radix calculations run locally in your browser memory. No numbers or clipboard contents are ever transmitted over the network.
