Integer Base (radix) Inter-Converter - Convert Integer From One Base Into Another
The initial default startup values are randomized.  Simply replace them with your own values.

Enter Integer ±X  (Expressed in any base from 2 to 36)

  Integer X     from base    to base      (base = 2 to 36)

Since we are using arbitrary-precision integer arithmetic, all computations will be exactly accurate to the last digit, which could possibly be extended out to hundreds or even thousands of digits.
v2.7 - Jay Tanner - 2019