---
name: Ken Burns effect
slug: ken-burns-effect
category: motion
status: published
created: 2026-08-21T00:00:00.000Z
modified: 2026-08-21T00:00:00.000Z
definition: A slow pan and zoom across a still image that gives it motion, named
  after the documentary filmmaker who made the technique famous.
aliases:
  - name: pan and zoom
    source: community
  - name: slow zoom
    source: community
  - name: hero image zoom
    source: community
tags:
  - media
relations:
  contrastWith:
    - dolly-zoom
  variantOf: []
  partOf: []
  seeAlso:
    - parallax
implementations: []
sources:
  - title: "Wikipedia: Ken Burns effect"
    url: https://en.wikipedia.org/wiki/Ken_Burns_effect
demo: inline
exhibit: false
useWhen: a static image needs life without becoming video
---

The technique is older than the name. Filming a photograph and moving the camera slowly across
it, closing in on a face or drifting from one edge of a crowd to the other, is how archival
material has been cut into documentaries for as long as there have been documentaries. It
carries the name of the American filmmaker Ken Burns because his series leaned on it so
heavily that the move became his signature, and Apple then shipped a feature called after him
in iMovie, which is how a director's habit became a checkbox.

On the web it is one CSS transform. A picture is cropped by a container with the overflow
hidden, and the picture itself is slightly larger than the crop and animates between two
transforms, so the visible region drifts and tightens. Because it is `transform` and nothing
else, it is one of the few decorative effects that costs almost nothing to run: the
compositor can carry it while the rest of the page gets on with its work. Hero sections,
slideshow slides, and the still frames between video segments are where it turns up.

The craft is entirely in restraint. One direction, not two. A zoom of ten or fifteen percent
over eight to twelve seconds, not a march across the frame. Linear timing, because a drift
that eases is a drift the eye can see starting and stopping, and the whole point is that the
motion should be noticed only in the sense that the image feels alive. The crop has to be
chosen around the focal point of the picture, so that the tightest moment lands on the face
or the horizon rather than on somebody's elbow, and the source image has to have the pixels
to spare, or the ending is a soft one.

It is also an effect with no information in it, which makes the accessible answer simple.
Under a stated preference for reduced motion the picture holds still, at a crop that was
composed to be looked at rather than at whichever frame the animation happened to reach. Not
slower, not shorter: static. Nothing was being said by the movement, so nothing is lost by
removing it, which is a rarer and more comfortable position than most motion decisions get to
be in.