About this tool
Convert an integer from one number base to another for any base between 2 and 36, using BigInt for exact results no matter how large the value.
Frequently asked questions
Which digits are valid?
Digits 0–9 then letters a–z, so base 16 uses 0–9 and a–f, and base 36 uses the full 0–9 and a–z.
Can it handle very large numbers?
Yes — parsing and conversion use BigInt, so even hundreds of digits convert without rounding errors.