Change Single Line Field to Url Field

Change Single Line Field to Url Field

Is there a way to do this? I unfortunately originally made my database using a single line field for the entering of Urls. It works 90% just fine, however I didn't realize that the single line field has a limit of the number of characters allowed. So, sometimes the url addresses added are just too long for the single line field. Is there a way to simply change the field into a Url field? There is a fair amount of data in the database that would be lost if I started over by deleting the single line field and making a new Url field.