1. Shape
Start with 9:16
A finished vertical demo needs a real 9:16 display canvas. A landscape source can still be reframed later, but it is not a finished vertical file yet.
Private app demo check
9:16 App Demo Video Checker
Check whether an app demo has the shape, size, playback support, and media settings you want before it becomes the product moment inside a vertical ad.
Nothing leaves your browserNo video conversion or uploadClear fixes for every warning
Check one file
Is this demo ready for a 9:16 ad?
Choose the exact file you plan to use. The checker reads its media facts locally and gives you a transparent result.
Drop one app demo here
MP4, MOV, WebM, and M4V files work best. The file is inspected on this device and is never uploaded.
Local-only check. No video upload or account required.
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How to use the result
Fix the blockers before polishing the ad.
2. Playback
Keep the handoff simple
MP4 with H.264 video and optional AAC audio gives browsers and production tools a dependable starting point.
3. Readability
Preview it at phone size
A passing resolution cannot guarantee the app interface is easy to read. Play the preview and check every important label and tap target yourself.
Common questions
9:16 App Demo Video Checker FAQ
Does ClipStitchr upload my video to check it?
No. Media Bunny reads the file from your device, the preview uses a temporary browser URL, and both are discarded when you replace the video or leave the page.
Does a Ready result guarantee every ad platform will accept it?
The checker uses ClipStitchr's durable production baseline: 9:16, strong vertical resolution, dependable browser playback, and broadly compatible media settings. It is not certification for every ad network.
What video size does the checker prefer?
1080×1920 passes the preferred resolution check. A 720×1280 video receives a warning because it can still be workable, while anything smaller needs another export.
Will the checker resize or convert my video?
No. This tool explains what to fix but does not convert or download a new video. ClipStitchr's paid workflow prepares source clips and turns them into finished ad variations.