The Cubic Bezier Editor is a visual tool for creating and fine-tuning CSS cubic-bezier() timing functions used in CSS transitions and animations. Instead of guessing at four numeric values, you drag two control points on an interactive curve preview and see the resulting animation motion in real time. The curve shape directly corresponds to how the animation accelerates and decelerates: a steep initial slope means fast acceleration, a flat slope means slow movement, and an overshoot above 1.0 or below 0.0 creates a spring-like bounce effect. The tool shows the generated CSS cubic-bezier() value that you copy and use directly in your transition or animation property. Preset easing functions are included for quick starting points: ease, ease-in, ease-out, ease-in-out, and linear. The live animation preview shows a moving element so you can feel the motion, not just see the curve. This tool is useful for frontend developers and UI designers who want precise control over animation feel. Cubic Bezier Editor is commonly used as a custom bezier curve tool, making it a practical choice for everyday tasks directly in the browser. As part of a broader workflow, Animation Builder can add CSS keyframe animations, CSS Variables Generator can generate CSS custom property systems, and Border Radius Generator can generate border-radius values with live preview.
CSS easing functions control the rate of change of an animation over time. The built-in keywords (ease, ease-in, ease-out, ease-in-out) cover common cases but are limited. Cubic bezier curves give you full control: the four values P1x, P1y, P2x, P2y define two control points that shape the speed curve. The x-axis represents time (always 0 to 1) while the y-axis represents animation progress. A y-value above 1.0 means the property temporarily overshoots its target value, creating a spring-like overshoot effect that feels very natural for interactive UI elements like menus, modals, and cards. A y-value below 0.0 creates a retract-and-release feel, similar to pulling back before throwing. Popular UI frameworks use carefully tuned cubic bezier values for their animation systems: Material Design uses cubic-bezier(0.4, 0.0, 0.2, 1) as the standard easing for most elements. You can replicate or modify these values directly in this editor. For page transitions and route changes, a gentle ease-out (starts fast, decelerates smoothly) feels most natural because it mimics the physics of an object coming to rest. For appearing elements (toasts, tooltips, dropdowns), ease-out with a slight overshoot makes the element feel responsive and alive rather than mechanical.