Number Base Converter
Convert non-negative integers between binary, octal, decimal, and hexadecimal.
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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Tool guide
About Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal with strict input validation. This is useful for programming, debugging bit fields, reading color or memory values, and learning number systems.
The converter uses BigInt for integer conversion, so it handles values larger than JavaScript’s regular safe integer range.
Common use cases
- Convert hex values from logs or memory addresses.
- Translate binary flags into decimal values.
- Check octal, decimal, and hexadecimal equivalents.
- Learn how the same integer is represented in different bases.
Practical tips
- Binary uses only 0 and 1.
- Hexadecimal uses 0-9 and A-F.
- This converter is intended for integers, not floating-point values.
Related tools
Frequently asked questions
Why is strict validation useful?
Strict validation prevents partial parsing, such as accidentally accepting invalid digits for a chosen base.
Can I convert very large integers?
Yes. The conversion uses BigInt rather than Number for integer values.
Does this support decimals?
It is focused on integer base conversion. Fractional values require different parsing rules.
Is Number Base Converter free to use?
Yes. Number Base Converter is free to use in your browser with no signup required.
Is my data uploaded when I use Number Base Converter?
Most FreeTools utilities process data locally in your browser. Tools that call third-party services, such as IP lookup and advertising, are disclosed in the privacy policy.
What can I use Number Base Converter for?
Convert numbers between binary, octal, decimal, and hexadecimal bases. Free online number base converter, no signup needed.