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Number Base Converter

Convert numbers between decimal, hexadecimal, binary, and octal. Enter any value in any base and all others update instantly. Handles large integers and shows the calculation.

Ctrl+Enter to run  ·  Ctrl+K to switch tools  ·  Recent button shows input history

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FAQ

What is the maximum number supported?

JavaScript safe integers up to 2^53-1. For larger numbers, use a dedicated big-integer library.

Can I enter hex with 0x prefix?

Yes — the hex field accepts values with or without the 0x prefix.

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