Numbers v3.1: Automatically link URLs in spreadsheet?
Another way to do this without clicking in each cell would be to use the =HYPERLINK() function.

Here are some steps:


Add a second column (Let's call it B)
In the adjacent cell, add a formula like this: =HYPERLINK(A1)
Drag the formula down


Provided that the original URL's are valid, this will convert them.

You can even add your own text in place of the URL.  (see screenshot)

So, given column A has a long list of URL's starting in cell A1, then in B1 enter:

=HYPERLINK(A1,"Clickable Link")

One could even parse the original URL to get just the human readable part using MIDDLE() or similar.

Hope this helps!!
Sample Numbers Formula for Hyperlink