Enter number (updates live)
From base
Binary
Base 2
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Octal
Base 8
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Decimal
Base 10
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Hexadecimal
Base 16
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Custom Base
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What This Tool Does
Enter any number in any base from 2 to 36 and instantly see its equivalent in binary, octal, decimal, hexadecimal, and any custom base you specify. Results update live as you type. Each output has its own copy button.
Frequently Asked Questions
What is a number base?
A number base (or radix) defines how many unique digits a number system uses. Base 10 (decimal) uses digits 0–9. Base 2 (binary) uses 0 and 1. Base 16 (hex) uses 0–9 and A–F. Base 36 uses 0–9 and A–Z, making it the highest base using standard alphanumeric characters.
What is hexadecimal used for?
Hex (base 16) is used extensively in computing: CSS colour codes (#FF5733), memory addresses, byte values in debugging, Unicode code points, and cryptographic hashes are all commonly expressed in hex because each hex digit represents exactly 4 binary bits, making conversion compact and readable.
What is binary used for?
Binary is the fundamental language of computers — all data is stored and processed as sequences of 0s and 1s. Understanding binary is essential for bitwise operations, networking (IP addresses, subnet masks), file permissions in Unix, and low-level programming.