How to Convert a Video to Apple App Preview Format

Updated 2026-07-18

Most screen recordings and demo videos aren't shot at the resolution Apple requires for App Preview — 886 × 1920 for iPhone, and a different size for each other device. Converting one for App Store Connect means fixing three things: resolution, aspect ratio, and duration.

1. Match the exact resolution

App Store Connect checks pixel dimensions exactly — it won't resize, letterbox, or otherwise adjust your file for you. See the full resolution table for every device before you start converting, so you know your target size.

2. Fix the aspect ratio, don't just stretch it

A source video shot in a different aspect ratio than the target (for example, a 9:16 phone recording being converted to iPhone's 886:1920 App Preview frame) needs to be scaled and cropped to fill the frame, not stretched — stretching distorts the footage. If your source is wider or taller than the target frame, the extra content on the long edge should be cropped after scaling the short edge to fit.

3. Trim to 15–30 seconds

App Preview videos must fall between 15 and 30 seconds. Trim before converting so you're not re-encoding footage you'll cut anyway.

4. Export as H.264

The final file needs to be H.264-encoded. Video exported from editing software as HEVC, ProRes, or another codec will be rejected even if the resolution and duration are correct.

The fastest way to do all four steps at once

Doing the scale, crop, trim, and codec conversion correctly by hand takes a few passes to get right — a source video that's the wrong aspect ratio for the target device is the most common way a "correct resolution" export still looks wrong. PreviewASO Screen does all four steps in one pass: upload your video, pick the target device, trim in the browser, and download a ready-to-upload App Preview file. The first conversion each day is free.