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Number Base Converter

Convert numbers between binary (2), octal (8), decimal (10) and hexadecimal (16). Shows working for each conversion. Free.

The Base Converter is a free online tool that helps you convert numbers between binary (2), octal (8), decimal (10) and hexadecimal (16). shows working for each conversion. free It runs in your browser with no sign-up, downloads, or installation needed. All processing happens locally — your data stays on your device.
Base Converter
Common number systems
🔢 Binary (base 2): uses digits 0–1. Used by computers internally.
🔢 Octal (base 8): uses digits 0–7. Used in Unix file permissions.
🔢 Decimal (base 10): everyday numbers, digits 0–9.
🔢 Hexadecimal (base 16): digits 0–9 then A–F. Used in color codes, memory addresses.

How to use the Base Converter

1

How base conversion works

All number systems represent the same quantities using different symbols. The number 255 in decimal is FF in hexadecimal, 11111111 in binary, and 377 in octal — they all mean the same thing. Each position in a number represents a power of the base.

2

Hex colors

Web colors use hexadecimal — #FF5733 means Red=FF(255), Green=57(87), Blue=33(51). Knowing hex helps you read color codes directly. Memory addresses in debugging also appear as hexadecimal, which is why programmers need to be fluent in it.

Frequently asked questions

Is the Base Converter free to use?

Yes, the Base Converter is completely free. There is no sign-up, no account required, and no limit on how often you can use it.

Is my text private when using the Base Converter?

Yes, all text processing happens in your browser. Your text is not sent to any server and is not stored anywhere outside your device.

What devices does the Base Converter work on?

The Base Converter works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.