Developer tool
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and custom bases from 2 to 36.
Processed entirely in your browser. No number is uploaded.
Use the toolNo account required
Use digits 0–9 and letters A–Z. Generated letters are uppercase. Prefixes such as 0x are not accepted.
Enter an integer and choose the source and target bases.
Integer number base conversion from base 2 through base 36. Fractions are rejected, and all calculations use BigInt locally to preserve large integer precision.
How it works
Convert integers without losing precision.
Choose source and target bases from 2 to 36. The converter validates every digit and uses BigInt arithmetic so large integers remain exact.
Integer-only tool
Fractions and ambiguous prefixes are rejected. Use plain digits and an optional leading negative sign.