Tools / Number base converter (binary, hex, octal)
Number base converter: binary, hex, decimal
Type a number and choose its base. All other bases update instantly.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Type the number.
- Choose the base it is written in.
- Read binary, hex, octal and decimal.
Your inputs live only in the link, not on our server.
Last checked: October 2026. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
How do I convert binary to decimal?
Multiply each digit by 2 to the power of its position and add: 1011 = 8 + 0 + 2 + 1 = 11.
What is hexadecimal used for?
For colours (#FF8800), memory addresses and compact binary data – one hex digit is 4 bits.