Step 1: Write the script and nail the hook
Every UGC ad lives or dies on its first three seconds. Open with a hook that names a problem, a result, or a bold claim your audience cares about — then keep the script short, spoken, and specific. Aim for 80 to 150 words, roughly 15 to 40 seconds when read aloud.
Write the way real people talk, not like a brochure. Use one clear call to action at the end, and keep the message to a single idea per video so you can test hooks cleanly later.
- Hook (0-3s): the problem, the payoff, or a pattern interrupt
- Body: one benefit, one proof point, in plain spoken language
- CTA: a single, direct next step
Step 2: Pick an AI avatar and voice
Choose an AI talking actor whose look, age, and energy match your target buyer — a tired-looking founder voice sells differently than an upbeat 20-something. The avatar speaks your script with realistic lip-sync, so the delivery should feel like a genuine recommendation, not a read.
Pair the avatar with an AI voice that matches the tone. Test a calm, trustworthy voice against a high-energy one; small changes in pacing and warmth can shift how authentic the ad feels. If you'd rather not use your own likeness at all, this approach also lets you create UGC without showing your face.
Step 3: Generate, subtitle, and export 9:16
Generate the video, then review the lip-sync and pacing. Add automatic subtitles — most UGC ads are watched on mute, so on-screen captions are what actually carry your message and lift watch time.
Export in 9:16 for TikTok, Reels, and Stories. You can also export 1:1 or 16:9 for feed and in-stream placements. Render a few versions with different hooks or avatars so you have variations ready to test, rather than betting everything on one creative.
Step 4: Test on TikTok and Meta
Treat your first batch as experiments, not finished assets. Upload three to five variations and let TikTok and Meta's delivery systems find the winner — the hook is usually the biggest lever, so vary it first, then test avatars and voices.
Before you launch, label AI-generated content where the platform requires it. Rules around whether AI UGC ads are allowed and the disclosure rules vary by platform and region, so it's worth understanding them before you scale spend.
Where Gencara fits
Gencara handles this pipeline in one place. You write the script, pick an AI talking actor and voice, generate the video, add automatic subtitles, and export in 9:16, 1:1, or 16:9 — no filming, no actors, no camera. Because each variation only takes minutes, you can produce several hooks and avatars from the same script and send them straight into testing.
It uses current top-tier video and voice models, so the output looks like genuine UGC rather than an obvious AI clip. There's a free trial, so you can ship your first ad before committing to a plan.