I need to replace my toilet flange. how do you get a glued on flange off without damaging the actual pipe?

you can't cut the pipe back use a cuppler and come off of that

There is a tool that will cut the old flange off that will not damage the pipe. It is brand new to the market and is available through Locke Plumbing supply, or call the manufacturer, Woods plumbing in OKC....405-722-2925