Transparent app videos — drop your app onto any background

Most app videos ship with their background baked in. The gradient that looked great in the editor now clashes with your landing page, fights your slide template, and traps your device inside a rectangle. A video with a truly transparent background has none of these problems: the device floats free, and whatever lives behind it — your hero section, your keynote, your edit — shows through.

There is a catch, and it is a big one: real transparency in video is notoriously hard to get. The encoders built into browsers simply do not carry an alpha channel. Here is why a transparent export is worth having anyway, where the traps are, and how Mockpose gets you a true-alpha file without leaving your browser.

One asset, any background

A transparent device video is the most flexible marketing asset you can produce, because it separates your app from its surroundings. Render it once, reuse it everywhere:

• A floating hero device. Layer the video over your landing page's own gradient and branding. Redesign the page next quarter and the video still fits — no re-export needed.
• Picture-in-picture demos. Drop your app into a bigger edit — a launch video, a tutorial, a conference talk — without a colored box around it.
• Slides and keynotes. The device sits directly on your template, whatever the theme.
• Social cutouts. Blend the device into a bold composition instead of pasting a rectangle on top of it.

If the floating-hero pattern is what brought you here, our guide to device mockups for landing pages pairs well with this post.

Why transparency in video is hard

In the Mockpose editor, making a scene transparent takes one click: open the background panel and set the background to Transparent. For still images, that is the whole story — PNG exports keep full alpha transparency, free plan included.

Video is another matter. The encodes your browser can produce locally — H.264 MP4 and WebM VP9 — carry no alpha channel at all. Push a transparent scene through them and every see-through pixel renders black. That is not a Mockpose limitation; it is how these formats behave everywhere on the web.

So Mockpose watches your back. If your scene has a transparent background, the export dialog detects it, warns you, and preselects an encoding that actually carries alpha.

Two formats with real alpha

True-alpha video comes from our premium server rendering. It runs on GPUs and it is asynchronous: you keep working in the editor while the render happens, and the finished file lands in your exports. Two formats are available:

• ProRes 4444 — the editing-suite standard. It drops straight into Final Cut Pro, Premiere Pro, DaVinci Resolve or After Effects with real alpha, ready for compositing.
• WebM alpha (VP9) — the web-native option. It plays with full transparency in Chrome, Firefox and Edge.

One caveat on the web route: Safari does not play WebM alpha — it would need HEVC alpha, which is not available yet. Ship an MP4 fallback for Safari visitors, the same video rendered over a matching background, so nobody sees a broken hero.

Export a transparent app video in four steps

1. Build your scene — cinematic camera moves and the keyframe timeline all run in your browser — and set the background to Transparent.
2. Animate your device, or pick one of the 100+ templates.
3. Export and choose ProRes 4444 (for editing) or WebM alpha (for the web).
4. Drop the file over any background: hero section, slide, timeline, anywhere.

Quick sanity check before a long render: export a transparent PNG still first. Full alpha, one click, free plan included.

The Mockpose editor is free to use — exports up to 720p with a small watermark — and premium unlocks 4K, watermark-free files and the server rendering that makes true-alpha video possible. Open app.mockpose.com, set your background to Transparent, and watch your app float.