Near the beginning, when pirates raid Port Royal, there is a massive fight, including slashings, stabbings, and shootings. These are fairly violent and intense.
Barbossa shoots one of his crew to see if they are still cursed.
A pirate spurs on a donkey with a hot iron, as the animal audibly reacts in pain. Later, a blacksmith employs the same hot iron in a sword fight with the pirate.
Elizabeth is slapped by a pirate while parleying with Barbossa.
Action/Adventure violence and very mild blood
In an early scene, we see men turn into gruesome, decaying skeletons when hit by the moonlight.
Multiple scenes involving pirates sword fighting and gunfire, with some individuals that are stabbed or shot (non-graphic).
A man is shot in the chest and blood soaks his shirt then he falls over dead.
Dead pirate corpses are seen hung by nooses. (no blood)
A tomahawk axe digs into a pirate's back, but no blood is shown when retrieved.
A pirate is stabbed (not shown), then we see blood on the retracted knife. The pirate is cursed to be undead and so survives.
During the initial pirate raid, a butler opens the front door to a mansion and is immediately shot by pirates.
A pirate with a fake eye gets a fork stuck in his eye. He takes the fork out and you can see his fake eye on the fork.
There is a fairly intense battle scene between the living and the undead, but it is done under moonlight and nothing overly graphic is shown. However, it could be considered quite frightening.
An undead sailor slits the throat of a soldier. You see it from behind but it is still very violent.