In Brazil, video already accounts for almost half of all digital advertising investment. According to Digital Adspend 2026 , a study by IAB Brazil in partnership with Kantar Ibope Media , the format represents 49% of digital spending, and much of this growth comes from the expansion of short videos, the same format that dominates Reels, TikTok, and Shorts. For those who sell online, this data repositions a discussion where video ads have become the focus of performance on mobile devices, where most purchases take place.
The change isn't just in format, it's in behavior. Consumers scroll through their feeds vertically with their thumb, almost always without sound, and decide in a few seconds whether to watch or skip. Effective advertising in this environment requires understanding this dynamic before allocating a budget.
In this article you will read:
Mobile video: what really matters when advertising?
- Video leads digital advertising investment in Brazil, accounting for 49% of the budget., driven by short video (IAB Brasil / Kantar Ibope Media, Digital Adspend 2026);
- Social media receives 55% of all digital investment in the country., and it is in them that the vertical format circulates (IAB Brasil / Kantar Ibope Media, Digital Adspend 2026);
- Most online purchases in Brazil are already made via mobile phone: According to a survey from December 2025, 79% of digital transactions were made via smartphone.
- Most videos on mobile devices are watched without sound.Because of the muted autoplay feature, subtitles and clear visual information are no longer optional;
- The first three seconds determine whether the ad will be seen or ignored; The hook needs to deliver the message before the impulse to jump;
- Short videos tend to generate more engagement per impression than static images., which favors direct response campaigns.
Why short video changed the logic of performance.
For years, performance advertising in digital retail relied on static images and text. This model still works, but it's rapidly losing ground. Short videos deliver three things that static images can't: product demonstration in use, a pace that holds attention, and a format that the platforms' own algorithms prioritize for delivery.
The result is reflected in the cost. When a video holds the viewer's attention for longer, the platform tends to deliver it to more people for the same price , which pushes the CPM down and improves the cost per result. It's not "creative magic," it's the auction mechanism responding to engagement.
There's also a discovery effect. Brazilian consumers use Reels, TikTok, and Shorts not only for entertainment but also to find products. Video advertising enters this flow without being aggressively disruptive, which reduces the typical rejection associated with more intrusive formats.
What changes in the production of video ads for mobile?
Advertising on mobile phones isn't about reusing TV commercials or cutting a horizontal video. The screen is vertical (9:16), consumption is fast, and the sound is almost never on. This reorganizes production.
1- Vertical, with caption and immediate hook
The framing needs to be vertical, occupying the entire screen. The subtitles become part of the message, since a large portion of the audience watches on mute. And the cliffhanger (the first scene) carries the weight of holding the attention of those who are about to scroll to the next piece of content.
2- Less "commercial," more platform language.
Pieces that mimic the organic aesthetic of the feed tend to perform better than productions that scream "advertisement." This doesn't mean amateurishness: it means aligning the creative with the context in which it will be seen, maintaining image quality, clarity of the offer, and an explicit call to action.
3- Volume and continuous testing
A single video rarely sustains a campaign. The mobile environment quickly wears out creatives, and performance depends on running variations, measuring, and replacing what has become tiresome. Mobile video strategy is an ongoing operation, not a one-off delivery.
How to measure the performance of video ads
Vanity metrics don't pay the bills. In mobile video, the indicators that guide decision-making are objective and linked to the sales funnel. It's worth keeping an eye on:
- Completion rate (VTR): How many people watched the video until the end is a direct sign of creative retention;
- CTR: The proportion of those who clicked after seeing the ad, measuring how much the ad converts attention into intent;
- CPM and cost per outcome: The intersection of the two shows whether engagement is, in fact, lowering the cost of acquisition;
- ROAS: The return on investment in advertising, which balances creative, media, and sales;
- Mobile conversion rate: Because it's pointless for the video to perform well if the landing page freezes on the mobile phone.
The most common mistake isn't choosing the wrong format, but rather measuring video using static metrics. Video has its own journey (from retention to click, from click to conversion), and each stage requires its own indicator.
Short video requires paid traffic with method
The format has changed, but the logic of performance remains the same: the right creative, for the right audience, measured by the right indicator. That's where a well-structured paid traffic operation makes a difference, in the continuous testing of creatives, in the correct interpretation of video metrics, and in the alignment between ad and conversion page.
If your online store is investing in video but isn't yet seeing the expected return, talk to the paid traffic experts at e-Plus . And, to delve deeper into your strategy, also explore other blog content about e-commerce performance.
FAQ – FREQUENTLY ASKED QUESTIONS
Do video ads perform better than image ads?
It depends on the objective, but on mobile, video tends to generate more engagement per impression and favors delivery by the algorithm. This usually reduces the cost per result in direct response campaigns. Static images still have value, especially in remarketing and simple offers.
What is the ideal length for a mobile video ad?
Short videos, generally under 30 seconds, better hold attention in the feed and register higher completion rates. The key is not the exact length, but rather delivering the main message in the first few seconds, before the user decides to skip.
Do I need expensive production to advertise with video?
No. In the social media environment, content using the platform's native language often performs as well as, or better than, more elaborate productions. What's essential is vertical framing, captions for silent viewing, and a clear call to action.
How do I know if my video ad is performing well?
Track completion rate, CTR, cost per result, and ROAS together. If the video retains the audience but doesn't convert, the problem tends to be in the offer or landing page, not the creative. Analyzing the entire funnel avoids optimizing the wrong metric.
