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Change a video background

Choose a new image or video background, position it, preview the composite, and create the finished video.

How it works
  1. ImportChoose source
  2. AnalyzeRun locally
  3. PreviewReview result
  4. ExportCreate file
InputMP4, WebM, MOV and M4V videoOutputMP4 or WebM video

Replacing the background puts your subject somewhere else entirely — an office, a set, a brand backdrop, a looping scene. This tool cuts the subject out, places your chosen image or video behind them, and lets you position and scale the new background while previewing the composite so you can judge whether the result actually holds together.

Matching the background to the footage

A composite fails on light before it fails on the mask. If the subject is lit from the left and the background implies a window on the right, the eye rejects it immediately, no matter how clean the cutout is. Match the direction and the warmth of the light, and match the perspective too — a background shot at eye level behind a subject filmed from below never sits right. The most forgiving choices are backgrounds that are soft, out of focus, or abstract, because they carry fewer cues to contradict.

Still image or looping video

A still background is stable, predictable and costs nothing to encode, which makes it the safer choice for presentations and talking heads. It can also look conspicuously frozen behind a moving person, which is why a gently moving background — drifting clouds, soft ambient motion, a slow pan — often sells the shot better. Keep the movement slow and low-contrast: a busy background competes for attention with the person you put in front of it, and every moving edge is another place for the mask to look wrong.

When to blur instead

If the cutout is not clean enough, replacing the background will show it. Blur is the fallback that almost always works, since the original background stays in place and the lighting continues to match. It is worth trying the replacement first and being honest about the preview — a composite that nearly works is more distracting than an honest blurred room, and viewers notice a bad key long before they notice a plain background.

Questions, answered

Do I need a green screen to replace the background?

No, the subject is separated directly from the picture. A green screen still gives cleaner edges, which matters more for replacement than for blurring.

Why does my composite look fake?

Usually mismatched lighting or perspective rather than the mask. Match the direction and warmth of the light and the camera height, and prefer soft or defocused backgrounds.

Can I use a video as the background?

Yes, an image or a looping video. Keep any motion slow and low in contrast so it does not compete with the subject.

The edges around my subject look bad — what should I do?

Try blurring the original background instead. It keeps the lighting consistent and hides mask errors far better than a replacement does.

What size should the background image be?

At least the resolution of your video, so it does not need upscaling. A larger image gives room to reposition and scale without softening.

Useful next steps

Continue with a tool that fits naturally after change video background.

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