How to Make AI Videos for TikTok (2026 Guide).

To make an AI video for TikTok, generate a 9:16 clip from a text prompt in a video model, burn in captions, then export and upload — no editor needed, and you can start free. TikTok's algorithm rewards consistency: 1 short per day for 30 days beats 1 viral hit. AI video tools turn that 30-day commitment from "impossible" into "coffee break."

This is the workflow we use to produce daily TikTok shorts at the getvivix studio. A few minutes per clip, no Premiere Pro or CapCut required.

What you need

• A free getvivix account (3 credits, no card)
• An idea for a 10-second clip
• A TikTok account

That's it. No editing software, no expensive subscription.

Step 1: Pick your model

For TikTok shorts, the sweet spot is Veo 3.1 Fast or Kling 3.0 Standard — both let you toggle synchronized audio on per render, and Kling tends to hold up well on human motion.

Open getvivix Text-to-Video and pick one. The credit cost is shown before you click generate. If you already have a photo or a still you want to animate instead of starting from a prompt, use Image-to-Video and feed it that frame. Not sure which model fits your clip? Our Sora vs Veo vs Kling breakdown walks through the trade-offs.

Step 2: Write a prompt that works in 9:16

Vertical video has rules. The eye reads top-to-bottom, not left-to-right, so:

• One subject, centered. Multiple subjects fight for attention in a narrow frame.
• Vertical motion beats horizontal. Pan up/down or zoom, not side dolly.
• High contrast. TikTok thumbnails are tiny — bold colors and strong silhouettes win.
• First 1.5 seconds = the hook. Front-load the wow.

Example prompts that work:

• "A neon goldfish swims toward the camera in a dark aquarium, slow zoom in, cinematic, 9:16"
• "Hands kneading dough on a marble counter, top-down view, soft window light, 9:16 vertical"
• "A tiny astronaut on a blue planet looks up at three moons, slow tilt up, 9:16, cinematic"

Step 3: Generate at 9:16

Set the aspect ratio to 9:16in the getvivix model controls. Most models support it natively; for the few that don't (some older Wan versions), getvivix auto-crops with subject detection so the speaker stays centered.

Hit generate, then check the timeline while you wait — most renders land in well under a minute.

Step 4: Add captions (the algorithm boost)

A large share of TikTok is watched with the sound off in public, so burned-in captions hold watch time that a silent clip loses. Open getvivix Caption Studio:

1. Drop the rendered MP4
2. Whisper transcribes every word with timing in seconds
3. Pick a viral caption style (MrBeast's bold yellow-on-black works well for this)
4. Drag any line you want to fix and edit the text
5. Export 9:16 with captions burned in

1 clip credit per export. Free signup includes 1 free clip credit. The same captioning flow powers our 5-minute podcast captioning guide if you want longer-form subtitles too.

Step 5: Hook test before you post

Before uploading to TikTok, watch the first 1.5 seconds with sound off. If you don't feel a pull, the clip won't hold a stranger either. Re-prompt with a bolder opening shot and try again.

Step 6: Upload + caption + tags

• TikTok caption: 1 sentence, 1 question. Questions drive comments. Comments drive distribution.
• Tags: 3-5 max. Mix one big (#ai), one medium (#aivideo), one niche (#aivideoartist).
• Sound: if your clip has native audio, leave it. If silent, pick a trending sound — TikTok's algorithm bumps clips using trending audio.

Multi-platform: post once, distribute everywhere

Same 9:16 MP4 also works for:

• Instagram Reels(re-upload, don't cross-post — Reels demotes obvious cross-posts)
• YouTube Shorts (auto-detected as Short if vertical and under 3 minutes)
• X / Twitter (vertical works, just not optimized)
• LinkedIn (yes, vertical AI clips perform well there now)

See the dedicated YouTube Shorts Maker page for the Shorts-specific workflow.

Common mistakes

1. Generating at 16:9 then cropping

You lose roughly two-thirds of the visual information. Always generate at 9:16 native.

2. Skipping captions

Plenty of TikTok is watched with the sound off in public. No captions means losing watch time you didn't need to lose.

3. Putting the hook at second 5

The algorithm decides at ~1.5 seconds whether to keep showing your video. The cool part needs to be first, not last.

4. Using one model for everything

Different shots need different models. Human dancing? Kling. Cinematic narrative? Sora. Dialogue baked in by default? Veo. getvivix lets you swap mid-session.

Frequently asked

How do I make an AI video for TikTok for free?

Sign up for a free getvivix account (3credits, no card), generate a 9:16 clip in Text-to-Video, add burned-in captions in Caption Studio, then export and upload to TikTok. The credit cost of each generation is shown before you click, so there's no guessing what your first clip will use.

Which AI model is best for TikTok shorts?

Veo 3.1 Fast and Kling 3.0 Standard both treat synchronized audio as an optional toggle per render. Kling 3.0 Standard tends to hold up better on human motion like dancing. For cinematic narrative, Sora 2 is the strongest option currently on getvivix.

Do AI TikTok videos need captions?

Yes. A large share of TikTok is watched with the sound off in public, so a silent clip loses viewers that a captioned one keeps. Drop your MP4 into getvivix Caption Studio, let Whisper transcribe it, pick a bold viral-style preset, and export 9:16 with captions baked in.

How much does it cost to post daily AI TikTok shorts?

There's no single fixed number — it depends on which models and resolutions you pick, since every model prices differently. getvivix shows the exact credit cost before you click generate, so you always know the spend up front. Start on the free tier to test the workflow risk-free, then decide whether daily posting is worth a paid plan.

What aspect ratio should AI TikTok videos use?

Generate natively at 9:16. Cropping a 16:9 clip down to a 9:16 frame throws away roughly two-thirds of the visual information. Set the aspect ratio in the getvivix model controls before you generate, and most models output vertical directly.

Try it tonight

Sign up free — 3 credits + 1 clip credit, enough to try the workflow end to end. See if AI video shorts fit your channel before paying anything.