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Number Base Converter

Convert between binary, decimal, hexadecimal, and octal instantly. Type in any field — the other three update live. Copy with one click. No signup, no install.

All conversion runs in your browser — no data is sent to any server.
Binary Base 2
Valid: 0 and 1
Decimal Base 10
Valid: 0–9, optional − prefix
Hexadecimal Base 16
Valid: 0–9, A–F (auto-uppercased)
Octal Base 8
Valid: 0–7