Number Base Converter

Any base from 2 to 36. That covers the common ones (binary base 2, octal base 8, decimal base 10, hexadecimal base 16) and every base in between. Base 36 is the largest that fits using the digits 0-9 followed by the letters a-z.

Bases larger than 10 use letters after the digit 9: a is 10, b is 11, and so on up to z which is 35. Input is case-insensitive, so FF and ff are read the same, and results are shown in lowercase.

Yes. The conversion uses arbitrary-precision integers (BigInt), so numbers with dozens or hundreds of digits convert exactly with no rounding or loss of precision, unlike calculators that rely on floating point.

Yes. A single leading minus sign marks a negative value and is carried through to the result, so -10 in base 10 becomes -1010 in base 2. Zero converts to 0 in every base.

Every digit must be legal for the base you chose. For example 2 is not a valid binary digit, and g is not a valid hexadecimal digit. Check that your input only uses digits allowed in the from base.

Yes. The conversion runs entirely in your browser. Nothing you type is uploaded, logged or stored anywhere.