How to Create Vertical Videos for Instagram Reels and TikTok Using AI

Published on: 10 October 2026

Why Vertical Video Is No Longer Optional for Businesses
What Makes a Great Vertical Video for Reels and TikTok
How AI Makes Vertical Video Creation Fast and Affordable
Step-by-Step: Create a Vertical Video With AI
Vertical Video Ideas for Small Businesses
Tips to Maximise Reach on Instagram Reels and TikTok
Frequently Asked Questions

1. Why Vertical Video Is No Longer Optional for Businesses

More than 70 percent of all video content is now watched on a mobile device held vertically. Instagram Reels, TikTok, and YouTube Shorts have made the 9:16 vertical format the dominant way people consume short-form video — and the algorithms on all three platforms actively favour original video content over static posts.

For businesses, this means one thing: if you are not producing vertical video, you are invisible on the platforms where your customers spend the most time.

The traditional barrier has been production. Vertical video requires different framing, different editing, and ideally content filmed specifically for the format rather than cropped from a landscape video. Hiring a content creator or videographer to produce Reels and TikToks consistently is expensive and time-consuming.

AI vertical video generation removes that barrier. You can create professional, platform-ready 9:16 videos from text prompts or product images in minutes, at a fraction of the cost of traditional production.

Websistant's AI video generation supports vertical video output natively, so your content is formatted correctly for Reels and TikTok from the moment it is generated.

2. What Makes a Great Vertical Video for Reels and TikTok

Before creating your vertical videos, it helps to understand what the platforms reward and what audiences respond to.

Format: 9:16 aspect ratio, 1080 x 1920 pixels. This fills the entire phone screen with no black bars on the sides.

Length: Instagram Reels allows up to 90 seconds; TikTok allows up to 10 minutes, but videos between 15 and 60 seconds consistently perform best for business content.

Hook in the first 2 seconds: Both platforms track how quickly viewers scroll away. A strong visual or statement in the first two seconds is what keeps people watching.

Captions: The majority of Reels and TikTok videos are watched without sound. On-screen text or captions ensure your message lands regardless.

Clear single message: The best performing short-form videos focus on one idea, one product, one tip, or one offer. Trying to cover too much in under 60 seconds dilutes impact.

3. How AI Makes Vertical Video Creation Fast and Affordable

AI video generation handles the most time-consuming parts of video production automatically:

Script to video: Write a short script describing your product, service, or message, and the AI generates a visual video with motion and voiceover.
Image to vertical video: Upload a product photo and the AI animates it into a 9:16 clip ready for Reels or TikTok.
Talking head in vertical format: Create a presenter video in vertical format using an AI avatar, without filming anything.

The cost with Websistant's pay-per-use AI video tool is $0.02 per second. A 30-second vertical video costs $0.60. You can produce an entire week of Reels content for a few dollars.

4. Step-by-Step: Create a Vertical Video With AI

Step 1 — Decide on your video concept. Pick one clear idea for the video. Examples: a product showcase, a quick business tip, a before-and-after, a limited-time offer, or a behind-the-scenes look at your service. One video, one message.

Step 2 — Write your prompt or script. For a text-to-video clip, write 2 to 3 sentences describing the scene, mood, and message. For a talking head video, write the script the presenter will deliver — aim for 50 to 150 words for a 30 to 60 second video.

Step 3 — Select vertical format. In Websistant's AI video generation tool, choose the 9:16 vertical output format before generating. This ensures the video is correctly framed for full-screen mobile viewing on Reels and TikTok.

Step 4 — Generate and review. Generate the video and watch it through on your phone if possible, since that is how your audience will see it. Check that the key visual elements appear within the centre of the frame and that nothing important is cut off at the edges.

Step 5 — Add captions before posting. Instagram and TikTok both offer auto-caption tools within their apps. Enable captions when you upload the video, or add them manually. Captioned videos consistently outperform uncaptioned ones.

Step 6 — Post and engage. Upload the MP4 directly to Instagram Reels or TikTok. Post at a time when your audience is active, write a short caption with relevant hashtags, and respond to any comments in the first hour to boost early algorithmic reach.

5. Vertical Video Ideas for Small Businesses

Running out of ideas is the most common reason businesses stop posting consistently. Here are ten vertical video concepts that work for almost any small business:

Product in action — show your product being used, not just sitting on a shelf
Quick tip — share one useful piece of advice relevant to your industry
Before and after — show a transformation your product or service creates
FAQ answer — pick your most common customer question and answer it in 30 seconds
Behind the scenes — show how your product is made or how your service works
Customer result — animate a written review into a short testimonial video
Limited offer — announce a sale or special package with urgency
Meet the team — introduce yourself or a team member in a short clip
How it works — a simple 3-step explanation of your service
Myth vs fact — bust a common misconception in your industry

Each of these can be produced as an AI-generated vertical video in under 10 minutes.

6. Tips to Maximise Reach on Instagram Reels and TikTok

Post consistently. Both algorithms reward accounts that post regularly. Three to five vertical videos per week is an achievable target when AI handles production.
Use trending audio on Instagram. Reels that use trending audio tracks get pushed to a wider audience. Add trending audio in the Instagram app after uploading your AI-generated video.
Write a strong first line in your caption. Only the first line of a caption is visible before "more" — make it a hook, not a description.
Use 3 to 5 targeted hashtags. Both platforms have moved away from rewarding hashtag stuffing. A small number of relevant, specific hashtags performs better than 30 generic ones.
Reply to every comment in the first hour. Early engagement signals to the algorithm that your content is worth promoting.
Repurpose across platforms. The same vertical video you post on TikTok can go on Instagram Reels and YouTube Shorts with minor caption adjustments — triple the reach for the same production effort.

7. Frequently Asked Questions

Does AI-generated video perform well on TikTok and Instagram Reels? Yes. The platforms care about watch time, engagement, and consistency — not whether the video was filmed by a human or generated by AI. A well-conceived AI video with a strong hook performs exactly as well as traditionally filmed content.

What resolution should my vertical video be? 1080 x 1920 pixels (9:16 aspect ratio) is the standard for both Instagram Reels and TikTok. Websistant outputs vertical videos at this resolution by default when you select the vertical format.

Can I add music to my AI-generated vertical video? Yes. You can add music directly within the Instagram or TikTok app when you upload the video. Using a trending track from within the app is recommended over embedding music in the video file itself, as it avoids copyright issues and increases reach.

How often should I post Reels and TikToks for my business? Three to five times per week is generally recommended for accounts looking to grow. With AI video generation, producing this volume of content is realistic even for a one-person business.

Do I need a large following for Reels and TikTok to be worth it? No. Both platforms distribute content to non-followers through their discovery feeds. A new account with zero followers can reach thousands of people with a single well-performing video.

Ready to start publishing vertical videos for your business without filming anything? Try Websistant's AI vertical video generator — your first $5 in credits is free, and your first video can be ready in minutes.