Key Frame / Keyframe

What is Key Frame / Keyframe?

A Keyframe marks a critical moment in animation: a pose, position, or visual state that defines the beginning, end, or important point of a movement: with all the frames in between filled in to create smooth motion.

At a glance

Also known as
Key frameKey poseKey drawing
Used for
Defining critical poses and positions in animationMarking parameter change points in motion graphics and video editingGuiding AI video generation through specified visual states
Common tools
Adobe after effectsAdobe animateToon boom harmonyBlenderAI video generation platforms with keyframe control
Related terms
In-betweeningTweeningAnimationFrame rateKeyframe extraction

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How it compares

How it compares

Compared with related concepts

A keyframe defines a critical moment; in-betweening fills in the motion between those moments. The quality of keyframes: how well they capture the essence and intent of the movement at its most important points: determines the overall success of an animation even after perfect in-betweening. A great keyframe communicates the pose, weight, and dramatic intent of the character at that critical instant; in-betweening then makes that moment part of a fluid sequence.

Think of it like…

A keyframe is like a plot point in a story: it marks the moments that must happen and establishes the structure of the narrative, with everything in between existing to connect those essential moments smoothly and believably.

Pro tip

When using keyframe-guided AI video generation, choose reference images for your keyframes that capture not just the visual content you want but the lighting, mood, and compositional quality of the whole shot: the model will attempt to maintain consistency with whatever characteristics your keyframe images establish.

Types and variations

  • In traditional animation, keyframes are physical drawings marking critical poses.
  • In digital animation and compositing, keyframes are parameter states at specific time points from which software interpolates.
  • In AI video generation, keyframes are reference images provided at specific time points that guide the generation process.
  • Ease keyframes in digital tools use curved interpolation to produce natural acceleration and deceleration; linear keyframes produce constant-speed motion between states.

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Common use cases

Keyframes are used in all forms of animation to establish and structure motion; in motion graphics to define how elements move through a composition; in video editing to animate effects, transitions, and corrections over time; in 3D animation to define character poses and camera positions that the software then interpolates; and in AI video generation to provide target visual states that anchor the generated motion at specified moments in a clip.

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FAQs

What is a keyframe in animation?
A keyframe is a drawing, pose, or parameter state that defines a critical moment in an animation: typically the start, end, or a significant point of a movement. In traditional animation, keyframes are drawn by lead animators to establish the structure of motion, with in-between artists filling in the transitional frames to create fluid movement.
Why are keyframes important?
Keyframes are important because they define the dramatic intent, timing, and structure of animated movement. The quality of keyframes: how effectively they capture the weight, pose, and energy of a character at critical moments: determines the overall success of an animation regardless of how well the in-betweens are executed. The keyframes are the bones of the movement.
How are keyframes used in digital video editing?
In digital editing and motion graphics software, keyframes mark time points where parameter values change: position, scale, opacity, colour correction, and effect settings can all be keyframed. The software automatically interpolates between the values defined at each keyframe, creating smooth transitions and animated effects without requiring the editor to specify every intermediate value manually.
What is the difference between a keyframe and a regular frame?
A keyframe is a specifically defined, intentional marker that establishes a critical visual state or parameter value. Regular frames in animation are in-betweens: the transitional frames calculated or drawn to fill the motion between keyframes. In video, all frames are equal captures of the ongoing image, but keyframes in editing software are special markers that define how parameters behave over time.
How do keyframes work in AI video generation?
Some AI video generation systems allow creators to provide reference images as keyframes: specifying what the video should look like at particular moments (beginning, middle, end). The model then generates the motion that transitions between these specified visual states, giving creators control over critical moments while leaving the AI to synthesise the connecting footage.
What is the relationship between keyframes and in-betweening?
Keyframes and in-betweening are complementary: keyframes define the critical moments that anchor the animation, and in-betweening fills in all the intermediate positions that create fluid motion between those moments. Without keyframes, there are no critical moments to connect; without in-betweening, keyframes remain isolated poses with no transition between them.
What are ease keyframes?
Ease keyframes use curved interpolation between values rather than constant linear change, producing motion that accelerates gradually from the first keyframe and decelerates into the second: or the reverse. This creates naturally weighted, organic-feeling movement that better matches how objects behave physically. Most animation software supports ease-in, ease-out, and ease-in-out curves for keyframe interpolation.
Can keyframes be used in 3D animation?
Yes. Keyframing is fundamental to 3D character and camera animation. Animators pose characters and cameras at specific moments in time using keyframes, then the 3D software interpolates all the in-between positions, rotations, and parameter states. Motion capture data is essentially a very dense set of keyframes ( one per frame ) recorded from a performer and applied to a 3D skeleton.
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