Preview‑Video Playbook for Founders: Contractor‑Ready Kit to Produce 15–30s App Previews That Convert

App previews occupy prime real estate on both the App Store and Google Play and autoplay for many users — that makes them one of the highest-leverage assets for converting store visitors into installs. But they’re also technical: Apple requires previews to be 15–30 seconds and strict about device dimensions and encoding, and Google Play shows previews before screenshots and may autoplay muted clips up to 30 seconds. Start with the platform requirements before any creative work to avoid wasted production time.

Treat the preview as a conversion experiment, not a demo dump. Use the first 3–7 seconds to communicate a single clear value proposition (the hook) and then demonstrate one high‑impact task in real UI. Keep overlays short and legible: long paragraphs or multiple feature lists kill attention.

Write a one‑page creative brief for contractors that includes: the single conversion goal (e.g., trial starts), primary persona, device orientation(s), and the store language/locale. Attach the storyboard: a 4–6 frame strip that maps seconds to visual and text overlay. For example: 0–3s (hook headline + action), 4–12s (core flow), 13–22s (benefit + social proof or CTA), 23–30s (app logo + CTA).

Use three short, tested script templates you can swap by hypothesis: (A) Product Hook — fast UI + headline showing what it does; (B) Benefit Story — short user‑context scene then product solves it; (C) Walkthrough — stepwise task completion with microcopy overlays. Each script should map to a frame‑accurate shot list that specifies exact timestamps, frame in/out, UI element shown, tap/cursor motion, and overlay text.

Localize smart, not exhaustively. Translate only critical overlays (hook headline, CTA, and short labels) and leave UI text visible where it’s already localized in the app. For many language variants you can reuse the same video master and swap a localized text layer in post or use subtitle files — this is faster than full re‑recording.

For contractors, request projects delivered as an edit + compositing file (Premiere/Final Cut/After Effects) plus a flattened master per resolution. That lets you swap localized overlays, change poster frames, and re‑export without a full re‑shoot.

Follow platform docs exactly. Apple’s official App Preview spec lists the 15–30s duration requirement and device‑specific dimensions (portrait and landscape variants) and enforces strict encoding. Google Play’s help center explains that preview videos display before screenshots and can autoplay muted for up to 30 seconds; Play often prefers a YouTube link for video hosting. Use H.264 (AVC) with AAC audio and match the exact frame rate and pixel dimensions for the target device to avoid rejections.

Common production checklist for final masters: exact resolution for each device size, constant 30fps (or the platform’s specified fps), H.264 codec with baseline or main profile, stereo AAC (even if silent), correct duration (15–30s), and a high‑quality poster frame (first frame is often used). If you produce multiple orientations, export a separate master per orientation and language as required by App Store Connect or Play Console.

Run an A/B test before you assume a video helps. Use a store‑listing A/B testing platform or Play Store experiments (where available) to compare: control (screenshots only) vs variant (screenshots + video). Define success metrics in advance: install conversion rate (visitors → installs) as primary, and short‑term retention (day‑1 and day‑7) as secondary to detect unhelpful promises that drive churn.

Design experiments to test one variable at a time: Hook vs Benefit script, 15s vs 30s, localized overlay vs English overlay. Collect at least a few thousand visitors per variant if possible; if traffic is small, run sequential short experiments and use consistent measurement windows. Track downstream metrics in your analytics (trial starts, activation events) to see if the preview attracts quality users or only curiosity installs.