The valve won't turn so I'm looking to replace it.
I think it's a sweat type but I'm looking for confirmation.
Is this a sweat or threaded valve?
Edit: Scraped pipe
Edit 2:
Toilet Plumbing – How to Identify Toilet Shutoff Valve Types
plumbingtoiletvalve
Related Solutions
I don't think that is a compression fitting, it looks more like the valve is threaded. Have you tried just turning the valve (silver in color) and not the brass fitting (which is probably soldered onto the pipe)?
That's most likely a copper pipe covered in solder. You can try scraping the solder off to see if you get down to some copper to verify. A copper pipe cutter is cheap and easy to use:
Get this onto the pipe a close to the valve as you can, tighten the screw until it's snug, and spin it around the pipe making sure to keep spinning on the same location (you're making a cut, not treading the pipe or making a spiral). After every few turns, tighten the screw a little more and eventually the pipe will break off. Clean the pipe with some emery paper, and install a new compression style valve (this only requires a few wrenches (crescent or fixed, not a pipe wrench or pliers if you want to avoid teeth marks). If you removed too much of the pipe, you may need to replace the escutcheon with a flatter style.
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Best Answer
It is a sweated valve with a screw on attachment for the toilet connection.
Rather than try to remove it, I'd buy a second one; they are typically quite cheap. With a helper available, use a giant wrench to try and break the valve free. If the valve breaks, turn off the water; if it moves, great.
If it doesn't break free, take the handle off and then take the packing / valve mechanism out by unscrewing the front hex net and removing the valve innards. Replace them with the parts from the donor valve.
If you get lucky, you'll save the time necessary to desolder, clean, and re-solder a valve.