Online video converter
App Store Preview Video — Convert to the Exact Size Apple Accepts
MP4, MOV, WebM, GIF, JPG, PNG, WebP, HEIC, ZIP
Up to 100 MB free · 1 GB with Pro
HEIC, animated WebP input, PNG sequences and frame sequence export require Pro.
App Store Connect refused your app preview: the dimensions aren't one of the accepted sizes, the frame rate is wrong, the clip is outside 15–30 seconds, or there's no audio track. A screen recording or an editor export rarely gets all of those right on its own. Drop the video here — the App Store is already chosen — press Convert, and upload the MP4 you get back.
LightBox looks at your clip's shape and orientation and picks the accepted preview size it fits best. The video is scaled to fit inside that size and padded with black where the shapes differ, so nothing is ever stretched. It's encoded as H.264 at the steady frame rate Apple asks for, cut to 30 seconds at most, and always given an audio track — a silent one if your recording has no sound.
A clip shorter than 15 seconds can't become a valid preview, so LightBox tells you instead of converting it. The App Store destination is part of Pro: unlock it with a one-time upgrade or a 24-hour pass. Nothing is ever watermarked.
Why convert with LightBox
Matched to an accepted resolution
Portrait or landscape, phone or tablet shape — your clip is matched to the nearest accepted preview resolution, so there's no table of device dimensions to look up.
Never stretched
Your clip is scaled to fit inside the preview frame and padded with black where the shapes differ. Interfaces, text and faces keep their proportions.
Ready for App Store Connect
H.264 video at the steady rate Apple asks for, with a soundtrack — a silent one if your recording had none — so there's nothing left to fix before you upload.
Free forever. Pro when you need more.
Convert common formats free. Lifetime Pro adds more capacity and permanent hosting, with no subscription.
| Limit | Free | Lifetime Pro |
|---|---|---|
| File size | 100 MB | 1 GB |
| Per day | 2 files | Unlimited |
| Files kept | 1 hour | Forever |
| Batch | 1 file | 20 files |
| Queue | Standard | Priority |
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