If you open this link
to the cloud
in your web browser
and then you scroll down until you see "Create a New Notebook" in the lower right
and then you click on that
and then you patiently wait a bit for the new page to finish initializing
and then you click your mouse in the middle of that large blank page
and then you carefully paste all this
StringJoin[{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"}[[RealDigits[Pi,36,5000][[1]]+1]]]
into the blank page
and then you patiently wait until all that appears
and then you click on Evaluation in the upper right corner
and then you click on Evaluate Cells
and then you patiently wait a bit until it finishes
then you should see the first 5000 digits of pi in base 36 starting with this
353i5ab8p5fsa5jhk72i8asc47wwzlacljj9zn98ltxm61vyms1frytci4u2qfra
You can then carefully click on the inner bracket along the right edge of that, sometimes it takes a couple of clicks until you find just the right place to click, the border bracket should turn blue and then you can copy that to your clipboard and paste it into another document.
That page is likely not as forgiving of variation in notation and like WolframAlpha it has some limitations, but it might provide you with a way to get the digits that you are looking for.