Green screen background maker — free, private

Green-screen (chroma key) compositing is the technique behind virtually every weather forecast, movie effects shot, and YouTube thumbnail with a subject floating over a custom background. The trick is to start with a clean cutout on a uniform green that your video editor's chroma-key filter can drop out cleanly. VanishBG makes this trivial: drop your photo, the AI removes the original background, and you can composite the subject onto chroma green (#00B140, the broadcast standard) or neon green (#00FF00, popular for thumbnail work) with one click. Unlike a physical green-screen shoot, you don't need studio lighting, a green backdrop, or careful subject-to-background separation — the AI handles the segmentation pixel-perfectly even on messy real-world backgrounds. Export at YouTube thumbnail dimensions (1280×720), Shorts cover (1080×1920), or any custom size, then drop the file into Premiere, DaVinci Resolve, Final Cut, or CapCut and apply the chroma key. Because everything happens in your browser, your unreleased video stills never leave your device — important when you're working on embargoed content. The whole pipeline is free, with no watermark and no sign-up.

Chroma green works best when the green is perfectly uniform and the subject edges are crisp — exactly what this tool produces. The AI cutout preserves hair, fur, and semi-transparent details far better than a manual lasso in a video editor, which means your chroma-key filter has clean edges to bite into and you won't see green fringing around the subject. For thumbnail work, many creators prefer neon green (#00FF00) because it reads as an intentional design choice even when the background stays visible. You can also pick a custom color if your project needs a specific brand background baked in. All exports keep full resolution — no automatic downscaling — so the composite drops straight into your 4K timeline without quality loss. If you're producing a series of videos, keep the tab open: the model stays cached and each new still processes in seconds, with nothing ever uploaded to a server.