Developer
Number Base Converter
Enter a number in any base and instantly see it in binary, octal, decimal and hexadecimal. Input is validated per base and arbitrary-precision via BigInt, so even very large integers convert accurately.
Examples
Input
255 (Dec)
Output
Bin 11111111 · Oct 377 · Hex FF
How to use Number Base Converter
Choose the base
Select whether your input is binary, octal, decimal or hex.
Type the value
Enter the number; invalid digits for the chosen base are flagged.
Copy any result
Each output row has a Copy button for the converted value.
Why use this tool
Converts to all four bases at once
Validates digits against the selected base
Handles huge integers via BigInt — no precision loss
Copy any representation with one click
Frequently asked questions
Yes. Conversions use BigInt, so large integers convert exactly without floating-point rounding.
Yes. Leading 0x, 0b or 0o prefixes are stripped automatically before conversion.
Discussion
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