An AI shorts generator built around the opening frame
Shorts are decided before the first word lands. Render the vertical frame that stops the swipe, then preview how it moves — everything else in the video is downstream of that.
Generate a vertical opener
Step one renders your 9:16 opening still, and step two plays a motion preview of that frame.
Describe your product in the prompt — colour, packaging, label — and your AI actor will hold it.
The first frame is the whole battle
In a Shorts feed the viewer is already moving. Your creative does not get an establishing shot, a logo sting or a polite introduction — it gets one frame at thumb speed, and if that frame does not create a question the swipe finishes. This is why an ai shorts generator that focuses on the opener is more useful than one that focuses on length. Render the frame, look at it at the size it will actually appear, and be honest about whether it earns another second. Most openers fail because they are composed for a laptop and viewed on a phone.
Vertical composition has its own rules. The subject sits high because the bottom third is covered by the caption, the username and the interface. Faces are close and slightly off-centre. There is no wide establishing anything. Generating natively at 9:16 means the frame is built with those constraints rather than cropped into them afterwards.
Shorts-specific advantages
Composed for 9:16, not cropped
The presenter is framed for a phone from the start — subject high, face close, nothing important in the bottom third where the interface lives. Cropping a horizontal render into vertical is how you end up with a chin at the top of the screen.
Openers you can test in batches
Write five different first frames for the same script — a reaction, a product close-up, a mid-action grab, a direct-to-lens stare — and compare them. Hook variation is where retention curves separate, and it is cheap to test when a frame costs a prompt.
Motion check before the edit
The motion preview shows whether the opener still works moving. A frame that looks arresting when frozen can go inert the moment it animates, and finding that out before you build a full cut saves the entire edit.
Building an opener that holds
Three passes, all of them focused on the first two seconds.
Write the hook as a picture
Do not describe the topic — describe what is physically happening in the first frame. A hand yanking something out of a box, a face mid-reaction, a screen turned toward the lens. Verbs beat concepts here.
Render at 9:16
Generate vertically and view it small. If it does not read at thumbnail size on a phone, it does not read in the feed, no matter how good it looks on your monitor at full width.
Preview the motion, then swap hooks
Play the motion preview, then rewrite the opener rather than polishing it. Five genuinely different first frames will teach you more than five refinements of one that was mediocre to begin with.
Shorts questions
A vertical photoreal still designed to work as an opening frame, plus an optional motion preview of that still. You take the frame into your editor as the opener; full-length videos with sound come from the wider Arcads workflow.
Because the audience is scrolling, not watching. The opening frame is the only asset guaranteed to be seen, and everything after it depends on that frame buying a second of attention. Optimising it before the script is finished is not backwards — it is the correct order.
Usually yes for direct hooks, because eye contact reads as address rather than observation. Reaction and demonstration hooks often work better with the gaze on the product. Both are one word in the prompt, so test them against each other rather than guessing.
Yes. The composition rules are the same either way — subject high, face close, bottom third kept clear. Organic openers generally want a looser, less polished look, which you get by describing an ordinary room and unposed body language.
Keep exploring Arcads
Every Arcads page runs the same free AI ad generator. Jump to the capability, vertical or placement closest to the campaign you are briefing.
Write the frame that stops the thumb
Describe what is physically happening in second zero, render it vertically, and look at it small. That test tells you almost everything.