Number Base Converter

LOCAL · IN-BROWSER

Convert numbers between Binary, Octal, Decimal, and Hexadecimal. Arbitrary precision via BigInt.

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Supports arbitrary-precision BigInt — paste numbers of any size.

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About Number Base Converter

Live convert between binary, octal, decimal, and hexadecimal representations. Uses BigInt under the hood so you can convert numbers of any size.

All processing happens entirely in your browser using modern web APIs. Nothing is uploaded to our servers — your data stays local. Free forever for everyone, with a Pro plan for power users who want an ad-free experience and API access.

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