Number conversion runs locally in your browser. Nothing is uploaded.
Number Base Converter
Enter an integer in binary, octal, decimal, or hexadecimal and instantly see the equivalent values in every supported base.
Number conversion runs locally in your browser. Nothing is uploaded.
Convert number bases
Octal
Decimal
Hex
Base conversion without precision loss
Use this number base converter for programming, debugging, computer science homework, bitmask checks, color or memory values, and quick integer format comparisons.
The converter uses BigInt so large integers do not lose precision. It validates digits for the selected source base and supports optional negative signs.
How to use this tool
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Enter a number
Type the integer you want to convert, with an optional leading minus sign.
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Select the input base
Choose whether your input is binary, octal, decimal, or hexadecimal.
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Copy a converted value
Review the binary, octal, decimal, and hex outputs and copy the format you need.
FAQ
Does this number base converter upload my input?
No. All base conversion runs locally in your browser.
Can it handle large integers?
Yes. The tool uses BigInt to avoid JavaScript number precision loss for large integers.
Which bases are supported?
The converter supports binary, octal, decimal, and hexadecimal integer input and output.
Can I convert negative numbers?
Yes. Add a leading minus sign before the digits and choose the correct source base.