A video ad that converts opens with a hook that stops the scroll in the first 3 seconds, is shot vertically (9:16), still makes sense with the sound off thanks to captions, delivers one clear message and ends with a clear call to action (CTA). You only learn which version works best by testing several variants.
In a social feed, your ad's competition isn't other ads; it's friends, creators and everything else the viewer can scroll past in a second. This article lays out the building blocks of a video that survives that competition, as a practical checklist.
The first 3 seconds matter because that's when viewers decide whether to keep watching; a video that gets scrolled past can't deliver its message, however good it is. This opening is called the hook.
A hook's performance is measured by hook rate: the share of people who saw the ad and started watching the video. When hook rate is low, the problem is usually the opening scene or first line, not the product.
TikTok's creative best practices for performance ads make the same point: introduce your value proposition in the first 3 seconds and build a strong hook within the first 6.
A good hook touches a question or problem already on the viewer's mind and makes them curious about what comes next. Hook types that work:
Opening with a logo, brand name or long intro animation is the most common mistake. The brand can appear once the viewer is interested.
Video ads for Instagram Reels, Stories and TikTok should be vertical 9:16, because these placements fill the phone screen. Square (1:1) or 4:5 also works well in feed placements. Horizontal (16:9) video looks small in a mobile feed, but it's still useful for some placements and websites.
What to watch when choosing a format:
For sound-off viewers, the message must also be told visually through captions and on-screen text. Many people watch silently on public transport, at work or at night; an ad that relies only on voiceover becomes meaningless to them.
Practical rules:
Sound still matters. On sound-on platforms like TikTok, music and voiceover help the ad blend into the feed. The right approach is to edit for both sound-on and sound-off viewing.
A high-converting video ad usually has four parts: hook, problem or need, solution and proof, and call to action. This structure moves the viewer from "what is this?" to "where do I buy it?" in a few seconds.
Each video should carry one main message. Listing five benefits at once means none of them sticks. Testing different benefits in different variants is more effective.
A call to action is a short line that tells viewers the next step plainly. Instead of a vague "Learn more", phrases with a concrete action and a concrete benefit work better. Keep the CTA consistent between the end of the video, spoken and written, and the ad's button text.
A short ad script plans the four parts above second by second, writing what appears on screen and what is said in each scene. Writing the script before shooting lets you cut unnecessary scenes early and tighten the message.
Example script (for a fictional travel mug, vertical video):
Variants of this script are easy to make: change only the hook ("How much do you spend on coffee each month?") or only the target person (student, office worker, camper) and you have several versions. Changing one element at a time during testing shows you which change made the difference.
A video ad should be long enough to deliver one message and short enough not to lose the viewer; there's no universal right length. Starting with short videos makes sense for performance ads, because they're easier to produce and force you to tighten the message.
Adjust length based on data. Hold rate is the share of people who started the video and watched to the end. If hook rate is good but hold rate is low, viewers aren't finding what was promised later in the video; it may be too long, too slow or unfocused.
These are the video types most often used in social media ads, and worth testing:
You can't know in advance which type will work for your product. You need to prepare several variants with different hooks and types and test them; we explain how in our ad creative testing guide.
Producing several variants by hand takes time. 14ads is a tool that generates the script, voiceover and video from a product page link; videos come in the vertical, square or horizontal format chosen for each campaign, with English or Turkish voiceover. Our guide to AI video ad generation covers what this kind of tool can and can't do.
When making video ads, pay attention to platform ad policies, copyright and the accuracy of your claims; a rejected ad is never shown. Meta's rules are on its Advertising Standards page.
There is no single right length; a video ad should be long enough to deliver its message and short enough not to lose the viewer. For performance ads in social feeds, short single-message videos are a good starting point for testing. Your own watch data will show which length works for your account.
A hook is the opening scene or line in the first seconds of a video that makes the viewer stop scrolling and keep watching. It can be a question, a surprising visual, a clear result or a familiar problem. A hook's strength is measured by how many of the people who saw the ad started watching it.
Vertical 9:16 is usually the best choice for Reels and Stories because it fills the entire screen. Square or 4:5 also works well in feed placements. Horizontal video stays small in a mobile feed, so it is rarely the first choice for social media ads.
In most cases, yes. Many people watch social media videos with the sound off, and without captions or on-screen text part of your message is lost. Captions also reinforce the message for people watching with sound.
In social media ads, authentic phone-shot videos often fit the feed better and don't feel like ads. That said, it isn't a rule; testing both approaches for your product category and following the data is the safest path.