How to Use the Pen Tool in After Effects

A workflow taught by Adobe Certified Instructors at Adobe Video World.

The Pen tool is one of the most powerful and most intimidating tools in After Effects. It lets you draw any shape or path with precision — for masks, custom shapes, motion paths, and more. Master it and a huge range of techniques opens up. This guide demystifies the Pen tool from your first straight line to smooth animated curves.

What the Pen Tool Does

The Pen tool draws paths made of points and the lines between them. Those paths can become masks that cut out part of a layer, shapes you fill with color, or motion paths an object travels along. It’s the foundation of precise, custom work in After Effects.

Unlike the shape tools, which only make rectangles and ellipses, the Pen tool draws absolutely anything. That flexibility is exactly why it feels tricky at first — but the underlying logic is simple once you understand points and handles.

Draw Straight Lines

Start simple. Select the Pen tool and click once to place an anchor point, then click again somewhere else to place a second point, and After Effects connects them with a straight line. Keep clicking to add more straight segments.

Each click drops a corner point, building a path of straight edges — perfect for geometric shapes and angular masks. Getting comfortable placing straight points first makes the jump to curves far less daunting, so practice clicking out a simple shape before adding curves.

Draw Smooth Curves

Curves are where the Pen tool’s power lies. Instead of just clicking, click and drag as you place a point, and two Bezier handles extend from it, bending the path into a smooth curve. The direction and length of your drag shape the curve.

Longer handles make broader, gentler curves; shorter handles make tighter ones. It takes practice to predict how a drag will bend the line, but this click-and-drag motion is the core skill behind every smooth path you’ll ever draw.

Control Bezier Handles

After placing points, you refine the curve by adjusting their handles. Switch to the Selection tool to drag a handle and reshape the curve, and hold Alt/Option while dragging a handle to break it, letting the two sides curve independently.

Breaking a handle creates a sharp corner with a curve on one side and a different curve or a straight line on the other. Mastering handle control is what lets you trace any complex outline smoothly, from a logo to the edge of a real-world object.

Create a Mask with the Pen

Drawing a closed path on a layer makes a mask. With a layer selected, use the Pen tool to click around the area you want to keep, then close the path by clicking back on your first point, and the layer shows only what’s inside.

This is the standard way to cut a custom shape out of footage or isolate an object. Feather the resulting mask edge for a natural blend, and keyframe the path if the object moves, which is the basis of rotoscoping.

Create a Shape with the Pen

Drawing with the Pen tool while no layer is selected creates a new shape layer instead of a mask. This lets you build completely custom vector graphics — a unique icon, a custom callout, an illustrated element — with full fill and stroke control.

Because shape layers are vector, your pen-drawn graphics stay crisp at any size and remain fully editable. The Pen tool is how you go beyond the basic rectangle and ellipse to design original graphics directly inside After Effects.

Add, Delete, and Convert Points

Paths are editable after you draw them. Hover the Pen tool over a path segment to add a point, over an existing point to delete it, and use the Convert Vertex tool to switch a point between a sharp corner and a smooth curve.

These refinements let you perfect a path without redrawing it from scratch. Adding a point gives you more control over a stubborn curve, while converting a vertex turns a hard corner soft — small adjustments that make a path exactly right.

Animate a Pen Path

Pen paths can animate, which unlocks morphing shapes and drawing-on effects. Keyframe a mask or shape’s Path property and reshape it on different frames, and After Effects smoothly interpolates between the path shapes for fluid, organic motion.

Combined with Trim Paths on a shape layer, a pen-drawn path can animate as if it’s being drawn on by hand. These path animations, eased with the techniques from our keyframe guide, are behind countless smooth motion-graphic reveals.

Pen Tool Best Practices

• Click to place corners; click and drag to create curves.
• Use fewer points for smoother, cleaner paths.
• Hold Alt/Option to break a handle for independent curves.
• Draw with no layer selected for a shape, on a layer for a mask.

Common Pen Tool Mistakes

• Using too many points, making the path lumpy and hard to edit.
• Fighting the handles instead of placing points where curves change.
• Forgetting to close a path when you need a mask or fill.
• Drawing on the wrong layer and creating a mask instead of a shape.

Practice Projects for the Pen Tool

The Pen tool only clicks once you use it on real tasks. Try tracing a simple logo to practice corners and curves, drawing a custom speech-bubble shape, and rotoscoping a slow-moving object to practice animated masks. Each exercise builds a different aspect of pen control.

Start with shapes that have a mix of straight edges and gentle curves before tackling intricate outlines. Within a few focused sessions the click-and-drag motion becomes intuitive, and you’ll find yourself reaching for the Pen tool confidently wherever a shape or mask is needed across shape layers and compositing.

Speed Up with Pen Tool Shortcuts

A few shortcuts make the Pen tool far faster. Pressing G selects it instantly, holding Ctrl/Cmd temporarily switches to the Selection tool so you can adjust a point mid-draw, and holding Alt/Option lets you break a handle without changing tools. These keep your hands on the keyboard and your flow unbroken.

Learning to switch between adding points, adjusting handles, and selecting without hunting through the toolbar transforms how quickly you can draw and refine a path. Like the wider set of editing shortcuts, a little memorization here pays back enormously over a long project.

Key Takeaways

• Click for corners and click-drag for smooth Bezier curves.
• Adjust and break handles to shape any path precisely.
• Draw on a layer for a mask, or on none for a shape layer.
• Keyframe the Path property to morph and animate your paths.

Frequently Asked Questions

How do I use the Pen tool in After Effects?

Select the Pen tool, then click to place straight-line points or click and drag to create smooth curves with Bezier handles. Draw on a layer to make a mask, or on no layer to make a shape.

How do I make smooth curves with the Pen tool?

Instead of just clicking, click and drag as you place each point. Bezier handles extend from the point, and the direction and length of your drag control how the path curves.

What’s the difference between drawing a mask and a shape?

Drawing with the Pen tool on a selected layer creates a mask that cuts out part of that layer. Drawing with no layer selected creates a new shape layer with its own fill and stroke.

Sources: Adobe’s guide to creating shapes and masks.