For ad creative, the horizontal-versus-vertical divide traces back to a single watershed year: 2018.
Before then, virtually every TVC and OTV ran horizontal — after all, the human gaze is naturally horizontal. But in 2018, two forces drove video formats to fork. First, smartphones (held vertically) went mainstream, and that year more than 52% of global traffic came from mobile. Second, the bottomless short-video feed exploded onto the scene, flooding screens with vertical clips designed to fill the entire phone display. Audiences began to develop a vertical-viewing habit.
From horizontal to vertical, from 16:9 to 9:16, what looks like a simple aspect-ratio flip has opened a new front in the media battle and a new blue ocean for brand marketing.
Just how different is the same creative when run horizontal versus vertical? When converting horizontal to vertical, can you simply center the frame and add letterboxing — or just crop and zoom into a portion of the image? More fundamentally, when a campaign is first scoped, should the accompanying creative be horizontal, vertical, or one of each?
"Horizontal vs. vertical creative differences" has long been a question that brand, marketing creative, and consumer-insight teams have tried to answer. Until recently, the high cost and long timelines of creative testing left the question unresolved. Today, however, the quantitative revolution — driven by mature AI creative testing and content-decoding technology — has changed that. "Horizontal creative vs. vertical creative — which is more effective, and how do you make each one effective?" now has an answer.
The product team behind AdEff, Mininglamp Technology's AI creative testing and screening tool, tested 35 horizontal/vertical creative pairs — 70 ads in total — decoding their content across 14 dimensions and 110 indicators. Using paired-sample t-tests, SHAP, and Gradient Boosting regression, the team analyzed the results and published the Horizontal vs. Vertical Ad Creative — Effectiveness Analysis & Creator's Playbook. Key findings:
- Horizontal and vertical are not just different aspect ratios — at their core, they are two completely different creative-language systems;
- Horizontal is "watch"-led and centered on visual storytelling; vertical is "listen"-led and primarily audio-driven;
- Horizontal calls for brand authority and polished, refined characters; vertical calls for content-native feel and authentic, real-life characters;
- The keys to a great horizontal: visual-first, dual-channel (voiceover + on-screen text) brand slogan delivery, wide range of shot types, montage storytelling, slow-then-fast pacing, escalating climax, low-density selling points, and a brand-slogan ending;
- The keys to a great vertical: audio-driven, BGM in service of the human voice, fully loaded subjects, natural-feeling visuals, mid-range shot types, calm and upbeat emotion, escalating climax, and a brand-slogan ending.
Horizontal vs. Vertical: Each With Its Own Strengths
Which is more effective — horizontal or vertical creative? It looks like an important question, but it's actually a false one.
Analyzing test data across 35 horizontal/vertical creative pairs, the research team found that horizontal averaged 61.5 and vertical averaged 60.8 — essentially a tie. But that "basically equal" headline conceals a deeper truth: horizontal and vertical excel at completely different things. The data shows:
For 60% of creatives, the horizontal version scored higher, by an average of 7.85 points; for 31%, the vertical version scored higher, by an average of 12.12 points. In other words, horizontal "wins" more often, but when vertical wins, it wins bigger.
The paired t-test results across five core dimensions reveal a clear division of strengths between horizontal and vertical:
- Horizontal leads significantly on the Attention dimension (horizontal 54.8 vs. vertical 50.7). The wide frame provides a stable visual anchor, eye-tracking is more concentrated, and gaze-recognition scores run 8.0 points higher. Horizontal's edge is, in essence, the "big-screen effect" — a wide frame, more visual information, more active attention;
- Vertical leads significantly on both the Emotional Resonance and Message Delivery dimensions. Vertical fills the phone screen, sits closer to the viewer, and is more effective at shutting out environmental distractions, so audiences engage more deeply. Vertical's edge is, in essence, the "immersive engagement effect" — the physical intimacy of a handheld device drives deeper cognitive investment, and a feed-native feel produces more "got hooked" moments.
Worth noting: when the underlying creative is the same, brand strength and persuasive power are unaffected by aspect ratio. That means brand recognition and purchase persuasion depend more on the creative itself than on the format it runs in.
Good Horizontal, Good Vertical — Each Has Its Own Playbook
Going one level deeper: which creative elements actually drive horizontal and vertical performance, respectively?
The AdEff research team compared the distribution of creative elements across the Top 10 (high-scoring) and Bottom 10 (low-scoring) horizontal and vertical ads, then cross-validated the findings against SHAP-based driver analysis to decode what makes a great horizontal versus a great vertical.
The Heart of a Great Horizontal: Visual Storytelling + Brand Authority + Escalating Emotion
Visual storytelling is the heart of a great horizontal. In high-scoring horizontals, voiceover share tends to be moderate or even absent, leaving plenty of room for visual storytelling. By contrast, low-scoring horizontals run heavy on voiceover, with high-voiceover share reaching 90%. Clearly, horizontal audiences are looking for "visual storytelling," not "voiceover bombardment."
Beyond that, 70% of high-scoring horizontals deliver the brand slogan through dual channels — voiceover plus on-screen text — versus only 40% in the low-scoring group. The takeaway: a horizontal's wide frame offers ample real estate for brand messaging without competing with the main visual subject.
On shot types and narrative pacing, high-scoring horizontals favor a wide variety of shot types (80% use more than five), and excel at montage editing for visual impact. The vast majority pace their stories "slow first, then fast" with an "escalating climax," and lean on calm-premium and upbeat emotional tones.
On information density and closing slogans, great horizontals are notably restrained — true believers in "less is more." 50% feature a single selling point, and 50% close with a brand slogan rather than product information.
If we had to sum it up in one line, a great horizontal is "a short film with brand sensibility."
The Heart of a Great Vertical: Happy Emotion + Audio-Led + Native Feel
The differences between great horizontals and great verticals are striking.
Where great horizontals lean into calm, premium emotion, 70% of high-scoring verticals carry a happy, joyful tone — versus only 30% in the low-scoring group. In the "thumb-pause" decision moment of a feed, positive emotion is the strongest "stay" signal. A vertical viewer decides within 0.5 seconds whether to swipe past, and a happy, joyful tone grabs attention instantly.
Unlike visual-first great horizontals, voice is what matters in high-scoring verticals: 80% of them have voiceover share at 70% or above. Their BGM volume is also generally lower — the goal being to keep the voice clear and intelligible.
Vertical audiences are wired to "listen" to content, and voice is the primary channel for delivering information.
Filling the frame is the iron rule of vertical: regardless of score, characters and products fill the center of the frame (60% subject loading). On shot types, vertical is the opposite of horizontal — great verticals stay disciplined at three to four shot types to keep the message in focus.
Also worth noting: the core aesthetic of vertical leans toward "real, native feel." High-scoring verticals are predominantly mid-tone (60%); the dark, premium tones that work in horizontal actually drag vertical scores down.
On information density and closing slogans, vertical and horizontal align. Both subscribe to "less is more": high-scoring verticals stick to one or two selling points, and 50% close with a brand slogan.
In one line, a great vertical is "native content with happy emotion."
For the full creator's playbook on horizontal and vertical creative — covering visuals, pacing, audio, strategy, and more — see the complete report.
Converting Horizontal to Vertical: 1 Core Principle, 6 Fundamentals
Reworking horizontal creative for vertical is a common operational challenge for brands and creators alike.
Can a horizontal simply be turned into a vertical? Based on this research, our answer is: yes, but not by simple cropping. The conversion has to be a systematic redesign anchored on "telling the story well."
Because horizontal and vertical run on completely different engines, naive aspect-ratio cropping forfeits the strengths of both formats at once. The core of horizontal-to-vertical conversion is to take the same good story and re-tell it in vertical's creative language.
We've distilled this into 1 core principle and 6 fundamentals for converting horizontal to vertical. The 1 core principle: "Horizontal-to-vertical isn't 'cropping the frame' — it's 'retelling the story.'" The 6 fundamentals span audio, composition, emotion, pacing, brand, and duration.
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Audio: from "Visual Negative Space" to "Audio-Led"
Horizontal keeps voiceover share below 70% to leave room for visual storytelling, but vertical audiences are wired to "listen," so voiceover share needs to climb above 70%. That means re-recording or adding voiceover, and dropping the BGM low enough that the voice stays clear and intelligible.
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Composition: from "Wide-Frame Breathing Room" to "Filled-to-the-Brim"
Horizontal favors a wide range of shot types, with subject loading between 30% and 60% — a strategy that's almost ineffective in vertical. Characters and products must be enlarged to fill the center of the frame, and shot types should be limited to three to four to keep the message focused.
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Emotion: from "Calm & Premium" to "Happy & Joyful"
Happy, joyful emotion is the number-one driver in vertical. If the original horizontal is "calm and premium," the vertical version needs to inject positive emotional elements. Happiness should run through the entire story while the content keeps its native feel.
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Pacing: from "Slow Start, Fast Finish" to "Energy from Frame One"
Horizontal can afford "slow first, then fast," but vertical viewers decide within 0.5 seconds whether to swipe past — a "slow open" is fatal in vertical. Vertical conversion has to front-load high-energy elements: open on a close-up, lead with visual impact, and plant a curiosity hook.
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Brand: from "Brand-Led" to "Content-Native"
Horizontal expresses brand through saturated brand color, the logo on screen throughout, and a brand-slogan close. Vertical, with its emphasis on native feel, calls for brand color to blend in naturally and the logo to appear at story-appropriate moments — though the brand slogan can still close the spot.
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Duration: Compress from 30s+ to 15s
Horizontal can run 30 seconds or longer, but asset duration is a strong negative driver of message delivery in vertical. If the horizontal original is 30 seconds or longer, compress the vertical version to within 15 seconds wherever possible.
For more horizontal-to-vertical conversion details, scan the QR code below to view the full Horizontal vs. Vertical Ad Creative — Effectiveness Analysis & Creator's Playbook.