How to fix app preview wrong resolution error in App Store Connect

When you drag an app preview video into App Store Connect, you might see it get rejected immediately with an error like this.

The dimensions of one or more of your files don't match the requirements for this device.

Sometimes the upload dialog simply refuses the file without much explanation. Either way, the cause is the same: your video resolution is not one of the exact sizes App Store Connect accepts.

In this article, we will learn which resolutions App Store Connect accepts and how to convert your video to match.

Cause of the problem

App Store Connect does not accept "roughly the right aspect ratio". Each device slot requires an exact pixel resolution, and here is the catch: no device actually records at these resolutions.

For example, an iPhone 16 Pro Max records its screen at 1320×2868, but App Store Connect wants 886×1920 for the iPhone 6.9-inch slot. So a raw screen recording will never pass, no matter which device you record on.

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Accepted app preview resolutions

Here are the resolutions App Store Connect accepts for each device slot.

How to fix the wrong resolution error

You need to scale (and usually crop) your recording to the exact target resolution.

Option 1: ffmpeg

This command scales the video to fill 886×1920, then crops the overflow so the output is exactly the right size:

ffmpeg -i input.mov -vf "scale=886:1920:force_original_aspect_ratio=increase,crop=886:1920" -c:v libx264 -preset slow -crf 18 -r 30 -c:a aac -ar 48000 output.mp4

Replace 886:1920 (in both places) with the resolution of your target slot from the table above.

The tricky part is that modern iPhones have a slightly different aspect ratio than 886×1920, so a naive scale either distorts the video or leaves black bars — both of which can get your preview rejected in review. The scale-then-crop approach above trims a few pixels from the edges instead.

Option 2: App Preview Converter (one click)

I built a Mac app that handles all of this for you: App Preview Converter.

You drop in your recording, pick the device slot (every slot in the table above is a built-in preset), and choose how to fit the video — fill or letterbox. The app exports a file with the exact resolution App Store Connect expects, and at the same time fixes everything else that can get your upload rejected:

• Constant 30 fps frame rate.
• Duration trimmed to the 15–30 second window.
• A silent audio track added if your recording has none.
• H.264 in an accepted container.

Related errors

• How to fix "The frame rate of your app video preview is too high" error
• How to fix "Your app preview contains unsupported or corrupted audio" error
• How to fix app preview video that is too long or too short

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You can find the full specification for every device in App Store Connect Help.