Uses exact integer arithmetic, including values larger than JavaScript’s ordinary safe-integer range.
How to use Number Base Converter
Convert whole numbers between base 2, 8, 10, and 16 while preserving integer precision with BigInt.
- Select the source base and enter digits valid in that base.
- Select binary, octal, decimal, or hexadecimal as the target.
- Convert and copy the resulting integer representation.
Worked example
Decimal 255 is binary 11111111, octal 377, and hexadecimal FF. Each representation describes the same integer.
Limits and things to check
Fractions and scientific notation are not supported. Binary accepts only 0 and 1; octal 0–7; hexadecimal 0–9 and A–F. A base conversion is not text encoding.
Will large integers lose precision?
The conversion uses BigInt rather than floating-point numbers, so it preserves supported integer inputs exactly. Keep the result as text when moving it to software that cannot represent large integers.
Processing and privacy
Your browser performs the operation locally. Inputs and results are not sent to OneClickWorks.
Common questions
Does this tool upload my input?
No. Processing happens in this browser tab and your input is not sent to OneClickWorks.
What happens when I leave the page?
In-memory input and generated download links are released when the page is reset, replaced, or closed. OneClickWorks does not persist tool content.