How to Apply Easy Ease to Keyframes in After Effects (F9)

Pressing F9 with one or more keyframes selected applies Easy Ease, converting their default linear interpolation into an eased curve that accelerates and decelerates smoothly rather than moving at a constant mechanical speed — one of the most consistently recommended first steps for improving the quality of any newly keyframed animation. **Why linear keyframes look wrong**: by default, After Effects interpolates a property's value at a perfectly constant rate between two keyframes. Almost nothing in observed real-world motion moves this way — objects accelerate from rest and decelerate before stopping. Linear motion reads as robotic or artificial specifically because it violates this expectation, even for viewers who couldn't articulate why a linear-keyframed animation looks 'off.' **What Easy Ease actually does mathematically**: it adjusts the keyframe's incoming and outgoing velocity to approach and leave zero smoothly, creating an S-curve shape in the underlying velocity graph rather than a flat constant-speed line. The default Easy Ease preset applies a moderate, general-purpose amount of easing suitable for most everyday motion. **Fine-tuning beyond the default**: after applying F9, opening the Graph Editor (Shift+F3) lets you manually reshape the eased curve further — dragging the Bezier handles on either side of a keyframe to make an ease-out sharper (fast start, hard stop) or gentler (slow throughout), tailored to the specific feel the animation calls for rather than accepting the one-size-fits-all default. **Related shortcuts**: J and K for jumping between keyframes to select the ones you want to ease, and Shift+F3 for opening the Graph Editor to manually adjust the resulting eased curve shape beyond the default preset. **Applying it to only one side of a keyframe**: right-clicking a keyframe and choosing Keyframe Assistant > Easy Ease In or Easy Ease Out (rather than the full F9 Easy Ease, which affects both sides) lets you ease only the incoming or outgoing velocity independently — useful when you want a motion to start instantly but decelerate smoothly into its landing point, rather than easing symmetrically on both sides. **A common mistake with a chain of many keyframes**: applying Easy Ease to every keyframe in a long, evenly-timed sequence can sometimes produce a subtly unnatural rhythm where each segment eases in and out identically, which reads as repetitive rather than organic — experienced animators often vary the ease intensity slightly between keyframes, or leave certain keyframes linear deliberately, rather than blanket-applying the default preset everywhere without further adjustment in the Graph Editor. **Visualizing the effect without opening the Graph Editor**: the keyframe icons themselves change shape after Easy Ease is applied — from a simple diamond to a shape with curved sides — giving a quick visual confirmation directly in the standard Timeline view that easing has been applied, without needing to switch into the Graph Editor just to check. Building the habit of applying and then fine-tuning ease curves, rather than accepting the default preset blindly, is what separates competent motion graphics work from genuinely polished animation. **Easy Ease and the Roving keyframe interaction**: keyframes set to roving (spaced automatically for constant speed across a segment) behave a little differently once eased, since Easy Ease reintroduces the very acceleration and deceleration that roving spacing was designed to eliminate, so applying both together on the same keyframe usually only makes sense if you understand which effect you actually want to dominate the motion.