There's a bunchhh of different ones and I'm sure people around here will have additional options but here's a few I found in a quick google search:
From what I've read, the top 3 in this list have good reviews on Reddit and don't compress images
In my personal opinion, avoid tinypic and photobucket. I feel like they're super clunky and more of a pain than anything. I use my own tumblr generally, because I post there also. Let us know if you really like any of these..maybe we can have a new recommendation for people if any work out for you!