How to Make AI Video for TikTok, Reels and Shorts

Start with the spec: 9:16, 1080×1920, sound-off

All three platforms share the same canvas — vertical 9:16 at 1080×1920 — but each crops the safe zone differently. TikTok stacks the caption, username and action rail up the right and bottom edges. Reels reserves the lower third for the caption and audio ticker. Shorts pushes controls along the bottom and right. Keep your subject and any on-screen text inside the center 80% and you survive every crop.

Win the first frame

The thumbnail is the frame that decides everything. On TikTok and Reels the feed autoplays, so your literal first frame is the hook — there is no separate thumbnail upload to hide behind. Brief the model so frame one already carries motion, a face, or a visible promise, not a slow fade-in from black.

• Open on the payoff, not the setup. Lead with the transformation, the reaction, or the product in-hand. Save the build-up for a video where you already earned the tap.
• Put a face or motion in frame one. A human gaze and any movement both beat a static logo card for stopping the thumb.
• Ban the fade-from-black. Motivate the camera to already be moving — "slow push-in on her hands, mid-action" — so the first frame is alive.
• Write the hook as on-screen text. Three to six words, burned in, readable at a glance. The model renders the plate; you keep the copy tight.
• Match the frame to the promise. If the caption says "watch this dry in 3 seconds," frame one should already show the wet-to-dry moment starting.

Pace it: cut on the beat, keep it moving

Short-form pacing is faster than you think. A held shot longer than ~3 seconds without a change — new angle, push-in, cut, or on-screen text — bleeds retention. You do not need frantic jump-cuts; you need a visible change roughly every couple of seconds so the eye never settles into "I have seen enough."

1. Storyboard in beats, not minutes. Hook (0–1s) → context (1–3s) → payoff (3–7s) → CTA or loop-back. Each beat is one directed clip.
2. Generate short, coherent takes and cut between them. A directed agent iterates on the previous render, so your angles stay on-model instead of drifting between generations. See how to keep a character consistent across AI video.
3. Cut to the audio. If you use a trending sound, align your beat changes to its hits. Silent-first design still benefits from an underlying rhythm.
4. Motivate every camera move. "Whip-pan to the reveal" earns the cut; "cinematic movement" does not.
5. Trim the fat. If a beat does not advance the hook or the payoff, cut it. Short-form has no room for connective filler.

Burn in captions — sound-off is the default

A large majority of short-form plays start muted, so treat captions as part of the picture, not an accessibility afterthought. Auto-captions from the platform work, but hard-burned captions you control read cleaner and survive re-uploads across TikTok, Reels and Shorts.

• Keep captions in the center 80%. Placed too low, the platform UI covers them. Sit them at roughly the lower-middle third, clear of the action rail.
• One idea per card. Short phrases that appear on the beat beat a wall of scrolling subtitles.
• High contrast, heavy weight. White text with a subtle outline or drop shadow reads over any background.
• Sync to speech and to cuts. Captions that land with the edit feel intentional; drifting text feels broken.
• Restate the hook. The first caption should echo the on-screen hook so a muted viewer gets the promise instantly.

Design the loop

The single cheapest way to double watch time is a seamless loop. When the last frame flows back into the first, the feed replays your clip and the algorithm counts the extra seconds. Loops are why "satisfying" content dominates — the video never visibly ends.

• Match first and last frame. Return the subject to its opening position, framing and lighting so the cut back to frame one is invisible.
• Hide the seam in motion. A pour, a spin, a wipe, or a whip-pan at the loop point covers the join better than a hard cut on a still frame.
• Keep it short for stills-into-motion loops. A 5–8s loop replays more times per view than a 30s one, stacking watch time faster.
• End on the promise, not a logo. A branded end-card breaks the loop; fold the brand into the action instead.
• Test the wrap in-app. Preview the replay boundary in the platform, not just your editor — the feed adds its own beat.

Which ReelWand agent for which clip

ReelWand runs 62 specialized visual agents. An agent is a public config plus a server-side style DNA — medium, lighting, grade, quality bar — assembled into every request. The brain never leaves the server, so a look you dial in cannot be copy-pasted out; it stays your signature. For short-form, three agents cover most jobs.

For selling something to a scroller, the UGC Ad Studio is the default. It carries a creator-camera style DNA — handheld energy, natural light, that authentic phone-shot texture — so every render already looks like a real person, not a polished commercial. Session memory means your second prompt refines the last take instead of re-rolling, so you iterate a hook rather than gamble on it. Pair it with the full AI UGC ad workflow to build a batch. If you want the underlying model comparison first, see the best AI video generator for social media.