Does iTunes use whatever cover art you give it, or does it use smaller versions?

Hi, I have a bunch of songs and a bunch of really high quality cover art, and the cover art takes up quite a bit of space. I was wondering if anyone knew whether I would have to downsize all of my cover art so that it doesn't take up a lot of space, or if iTunes (when importing to my iPhone) would take a lower quality version of it for use on my phone.

I mean it probably does, BUT in my experience, It looks no different then the original album cover. All my songs have artwork on them on my iPhone and they all look exactly the same so you have nothing to worry about.

  • Why is the iPhone 4s cover art in the music smaller than iPhone 5 and 6? I'm not sure how to explain it. I have a iPhone 4s and when I go to my music and click a song, the cover art is a little square, but for an iphone 5 or 6, the cover art covers the whole space.
  • Why does my cover art on my iPhone change? I backed my phone up to my computer and some of the cover art for my songs are different than the songs that are playing. What is going on? Any help thank you
  • Why do I get the wrong cover art from my iTunes to my iPhone? I download music from frost wire to my iTunes. On my iTunes it had the correct cover art but when it's on my phone the cover art from songs I've had that are now deleted are on the songs. I downloaded one song by dirt nasty and it gives me the wrong cover art from a song I deleted for ever ago. I even deleted frost wire and iTunes and downloaded them again but the problem still happens Help Please
  • When you give APPLE a defective IPHON do they give you a reconditioned one back? My IPHONE had a defect, still under warranty, so I took it to an Apple MAC store and after a few days they gave it back, supposedly repaired. Now the replaced IPHONE has a problem, different than the previous problem I'm now having a problem with the taking a photo. Do they just replace your phone with a reconditioned one they say no but?