This page converts numbers from one base to another. Up to base 36, you can use numbers 0-9 and letters A-Z. For example, 5DE99F is a valid hexidecimal (base 16) number. Above base 36, numbers can be entered as a list of digits. These digits are entered as base ten numbers. For example, a number whose first digit is 99, second digit is 88, and third digit is 777, working in base 1000 would be entered as [99,88,777]. The bases themselves are displayed in our usual base ten. Numbers are displayed as a list of alphanumeric digits (up to base 35) and as boxed digits for larger bases. The explanatory calculation is done using base ten numbers.
The computation above is powered by SageMath. The Sage code is embedded in this webpage's html file. To view the code instruct your browser to show you this page's source. For example, in Chrome, right-click and choose "View page source".