Can FXbuddy replace what is on a phone or laptop screen in video?

Yes. FXbuddy can describe a replacement screen content — a specific interface, a message, a cinematic display — and generate it onto the device screen in your clip. The AI respects the device's perspective angle and the screen's lighting reflection from the environment.

Does AI screen replacement handle the perspective angle of the device?

The AI analyses the perspective of the device screen in your clip and generates replacement content that matches that angle. For best results, describe the screen angle in your prompt: 'the phone is held at approximately 30 degrees from vertical, screen facing slightly toward camera.' The more context you give about the physical setup, the more accurately the replacement integrates.

Can I replace the content on a TV screen in the background of a shot?

Yes. Background TV screen replacement is a common use case. Describe the TV's position in the frame, its size relative to the background, and what content you want displayed. For background TVs, also specify the ambient light contribution — whether the TV is casting blue or coloured light on the surrounding wall and subjects.

AI VFX Prompts for Screen Replacement on Devices

Replace what appears on a phone, laptop, tablet, or TV screen in any clip — without a green screen prop or manual tracking. Describe the device and the replacement content, and FXbuddy generates screen content that matches the perspective angle and lighting of the device in your shot.

Screen replacement is one of the most practical VFX tasks in corporate video, narrative film, and content production. On set, it's common to shoot devices with blank or dummy screens and fill them in post — but traditional screen replacement requires motion tracking, corner pinning, and colour matching that takes time. Describing it in a prompt is a much faster path for many standard cases.

These prompts work best on shots where the device screen is clearly visible and not obscured by reflections, glare, or motion blur. For shots where the device is moving rapidly, give the AI explicit information about the device type, position, and angle so it can lock the replacement to the screen plane.

What FXbuddy needs in a screen replacement prompt

Device type and position: smartphone held in the left hand, laptop open on the desk in the midground, large TV in the background on the right wall
Screen angle: facing directly to camera, angled 30 degrees left, tilted slightly downward
Replacement content description: what you want displayed — a specific interface type, a message, a video playing, an alert
Screen brightness: bright, dim, very bright in a dark room, normal ambient brightness
Light cast: whether the screen should cast coloured light onto nearby surfaces or the subject's face
Reflection treatment: whether to preserve realistic screen reflections or show a clean screen surface

5 example prompts you can copy

replace the content on the smartphone screen held in the subject's right hand. the phone is approximately 30 degrees from vertical, screen facing toward camera and slightly right. display a simple chat interface — dark theme, message thread with short text messages visible. screen brightness matches the ambient indoor lighting. preserve realistic screen reflections from the overhead light.

replace the laptop screen content visible in the background midground. the laptop is open on the desk, screen facing partially away from camera — screen contents visible at about 60 degrees angle. display a code editor interface with syntax-highlighted code. the screen should cast soft blue-white light on the desk surface and on the back wall behind it. realistic office setup feel.

replace the TV screen in the background right of frame. the TV is a large flat panel, approximately 55 inches, mounted on the wall. display a news broadcast — lower-third text graphic with a presenter visible. the TV should cast blue-tinted light on the surrounding wall and reflect slightly on the floor surface below. realistic ambient TV light in a living room.

replace the tablet screen being held up by the subject in the centre of frame. the tablet is horizontal, screen fully facing camera — minimal angle. display a map application with route lines visible. bright screen, clearly readable. preserve the tablet bezel and physical frame around the screen. no reflections obscuring the content — clean screen read.

replace the phone screen the subject is looking at — the phone is face-up on the table in front of them, screen facing upward. display an alert notification — high-contrast notification card with icon and short text. the screen glows upward, casting soft blue-white light on the underside of the subject's face. dramatic, urgent notification atmosphere for a narrative scene.

Common mistakes

Not specifying the device angle: Screen replacement requires the AI to understand the screen plane's orientation. "Replace the phone screen" without angle information produces less accurate perspective matching than "the phone is angled 30 degrees from vertical, screen facing slightly toward camera."
Overly complex content descriptions: Describe the type of content (map app, code editor, chat interface) rather than trying to specify exact pixel-level content. The AI generates plausible representative content for the interface type you describe.
Ignoring the light cast: Screens in a scene cast light on surrounding surfaces. If your footage already has screen glow visible, include instructions to match or modify it. If the footage was shot with a blank prop, describe the light cast you want the replacement to produce.

Tips for better screen replacement results

For narrative scenes, describing the emotional context of the screen content ("a distressing news alert," "a successful transaction confirmation") helps the AI choose appropriate visual design for the content type.
Dark-theme interfaces (code editors, terminals, chat apps in dark mode) read more clearly in dark interior scenes. Specify dark or light theme based on the lighting of your shot.
For close-up phone shots where the screen is the hero of the shot, combine screen replacement with an object removal pass if there's a watermark or existing content you need to remove first.

Frequently asked questions

Can FXbuddy replace what is on a phone or laptop screen in video?: Yes. Describe the replacement content and the device's position and angle, and FXbuddy generates it onto the device screen. The AI respects the device's perspective angle and matches the screen's lighting from the environment.
Does AI screen replacement handle the perspective angle of the device?: The AI analyses the screen plane's perspective and generates replacement content to match. For best results, describe the screen angle explicitly: "the phone is held at approximately 30 degrees from vertical, screen facing slightly toward camera." More context = more accurate integration.
Can I replace the content on a TV screen in the background of a shot?: Yes. Describe the TV's position, size relative to frame, and replacement content. For background TVs, also specify the ambient light contribution — whether the TV casts blue or coloured light on the surrounding wall and subjects.

Related prompt guides

Removing Objects Prompts

Remove logos, props, and on-screen elements before replacement.

Cleaning Up a Shot Prompts

General shot cleanup for props, backgrounds, and continuity.

Background Replacement Prompts

Replace the full background environment in any clip.

Replace device screens in Premiere Pro

FXbuddy generates screen replacement VFX from a text prompt — no tracking, no corner pinning required.

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