Critical hits are characterised by a large, bold and italic font. The colour of the hitsplat indicates the combat style used, with orange for Melee, green for Ranged, and blue for Magic.
Before the combat updates of 14 July 2014, critical hits functioned via a critical bonus, a probability of how often a player would land a critical hit. There was a separate bonus for each of Melee, Ranged, and Magic, and each bonus could be increased by wearing jewellery, capes, scrimshaws, and certain weapons. These critical bonuses replaced the pre-EoC equipment bonuses (Strength bonus, Ranged strength and Magic damage).
When a player landed a critical hit, they dealt 100% to 105% of their attack's maximum damage. This applied to both abilities and auto-attacks.
Critical bonuses were changed to damage bonuses on 14 July 2014.