How to Use Video in Email Marketing to Lift CTR by 493%: The Tests We Ran and What Actually Worked

The email that changed our retention strategy was almost never sent.

It sat in a draft folder for eleven days while we argued about it. The argument wasn't about copy or design. It was about a technical question that nobody on our team could answer with confidence: does video actually work in email, or is it a gimmick that breaks in half the inboxes on earth?

I'd read the same articles you've probably read. "Video in email boosts CTR by 300%." "Video in email is a myth." Both claims, presented with equal confidence, sourced from nowhere. I'd asked three email marketing vendors and gotten three different answers. One told me video plays natively everywhere now. One told me it never plays and never will. The third told me to "test it and see."

So we tested it. Five variants. Four months. One winner that lifted click-through rate from 3.1% to 18.4%—a 493% increase—and dropped sixty-day churn among new signups by 34% when we layered it into the welcome series.

This is the full story. The technical realities that determine what's even possible. The five versions we tested. The screenshots we pulled apart pixel by pixel. The four that failed and why. And the framework we now use before we send any video email.

We built the video itself with LeoStudio, whose approach to clarity you can explore at leostudiohq.com. They were the ones who told me something that reframed the whole project: in email, the video isn't the asset. The thumbnail is. The video is what happens after the click. That distinction is the reason this test worked at all, and it's the reason most video email campaigns fail before they begin.

The Technical Reality Nobody Warns You About

Before the tests, the constraints. Because if you don't understand what email clients actually do with video, you'll design something beautiful that renders as a broken grey box.

Here's the honest state of video in email in 2026.

HTML5 video only plays natively in Apple Mail. That's it. Apple Mail on iOS and macOS supports embedded HTML5 video. Every other major client—Gmail, Outlook, Yahoo, Thunderbird, and the webmail clients most of your list actually uses—strips the video tag entirely. Gmail doesn't just strip it. Gmail actively removes it and, in some cases, routes the email to spam because of the video element.

Animated GIFs work almost everywhere, with one big exception. Outlook on Windows still doesn't reliably animate GIFs. It shows the first frame. That's not fatal—the first frame can be designed to look like a static image—but it means your GIF has to work as a still.

Static thumbnails with a play button work everywhere. This is the workhorse. A well-designed image that looks like a video player, with a play button overlay, linking to a landing page where the video actually plays. It renders in every client. It looks like video. It behaves like a link. It's what most successful video email campaigns are actually doing, even when they call it "video in email."

Autoplay is not a thing in email. Not in any client. Anyone who tells you otherwise is selling something.

So when we say "video in email marketing," what we're really talking about is one of three things. An HTML5 video that plays inline for Apple Mail users. An animated GIF that loops for most clients and shows a still frame for Outlook. Or a static thumbnail with a play button that links out to a page where the video plays.

We tested all three. Here's what happened.

Test 1: The HTML5 Inline Video

The setup. We embedded a 90-second MP4 directly in the email using the HTML5 video tag, with a poster image and a play button overlay. We sent it to a segment of 4,000 users.

The screenshots. In Apple Mail on an iPhone, it looked perfect. A 16:9 video, play button centered, poster image showing the first frame—which we'd designed to look like a paused screen recording of the empty dashboard. The caption underneath read: "90 seconds to your first win."

In Gmail on desktop, the same email showed a grey rectangle. The video tag had been stripped. What remained was the poster image with a broken play button that did nothing when clicked.

In Outlook, the same grey rectangle. The poster image didn't load because Outlook had blocked the remote image.

The numbers. Delivered rate: 97%. Open rate: 28%, roughly our baseline. Click-through rate: 3.4%. Essentially identical to our control email, which was text-only.

The Apple Mail users who saw the video clicked at 12%. The Gmail and Outlook users who saw a broken box clicked at 0.8%—well below our baseline. The aggregate was a wash.

The verdict. This didn't work, and it never will, because the audience is too fragmented. Designing an email that only functions for one client is a losing strategy. We retired this variant after the first send.

Test 2: The Animated GIF Preview

The setup. A 6-second animated GIF that looped through the first three seconds of the video—the cursor moving toward the button, the click, the first panel of the win screen. The GIF linked to a landing page where the full video played.

The screenshots. In Gmail on desktop, it looked alive. A moving image in the inbox, no click required, no play button. The motion caught the eye immediately—we saw it in the heatmaps later. Users hovered over the GIF before clicking.

In Apple Mail on iPhone, it was smooth and looked almost indistinguishable from video.

In Outlook on Windows, it showed the first frame. Just a static image of the cursor before the click. Not broken, not ugly—but not moving either. The Outlook users were seeing a still, not a preview.

The numbers. Click-through rate: 9.2%. Nearly three times our baseline. The GIF users converted to activation at 31% within seven days, versus 22% for the control.

The verdict. A real improvement, but not the winner. The GIF created engagement without clarity—users clicked, but a meaningful portion of them arrived at the landing page without context. They'd seen motion. They hadn't seen the message. The GIF was attention. It wasn't instruction.

Test 3: The Static Thumbnail With Play Button

The setup. A static image designed to look exactly like a paused video player. A 16:9 frame showing the empty dashboard. A centered play button in our brand color. A short line of text underneath: "Watch the 90-second shortcut." The image linked to a landing page where the video autoplayed.

The screenshots. This is the version we stared at for hours. In every client—Gmail, Outlook, Apple Mail, Yahoo, the phone, the desktop—it rendered identically. A clean, clickable, unmistakably video-shaped image. No broken boxes. No stripped tags. No browser-specific weirdness.

The play button was the detail that mattered. In early versions, we'd used a small, subtle play triangle. Click-through was fine. When we enlarged it and moved it slightly off-center—a design trick borrowed from the way YouTube places its play button—clicks went up. Users were responding to the play button as a signal, not a decoration.

The line of text underneath was the second lever. "Watch the 90-second shortcut" outperformed "Watch the video" by a wide margin. The word "shortcut" promised an outcome. The word "video" promised a task.

The numbers. Click-through rate: 18.4%. That's a 493% lift over the 3.1% baseline. Users who clicked activated at 41% within seven days, matching the activation rate of the in-app video cohort exactly. Sixty-day churn among new signups dropped 34% when this email was added to the welcome sequence.

The verdict. This was the winner. Not because it was technically impressive—it was a JPEG and a link—but because it worked everywhere, and because the design did the job of promising a specific, short, valuable outcome.

The single most important realization from this test was this: video in email marketing isn't about getting the video to play inside the email. It's about getting the user to click the thing that looks like a video. The video itself lives on the landing page. The email's job is the click.

This is the exact principle LeoStudio builds on, and it's why their work translates so well into email. They design for the moment before the play, not just the play itself. You can see that thinking throughout leostudiohq.com—the obsession with triggers, the respect for the user's attention, the refusal to overload the first impression. In email, the thumbnail is the trigger. The video is the destination.

Test 4: The GIF Plus Static Fallback

The setup. A hybrid. An animated GIF for clients that supported it, with a static fallback for Outlook. The GIF looped through the first four seconds of the video, then held on the play-button frame for two seconds before restarting.

The screenshots. In Gmail and Apple Mail, it looked great. Motion in the inbox, holding on the play button, then looping. The hold at the end of the loop was the key detail—it gave the user a moment to register the play button before the motion restarted.

In Outlook, the static fallback showed the play-button frame. Same visual as the winner from test three, but only for Outlook users.

The numbers. Click-through rate: 14.1%. Good, but below the static thumbnail.

The verdict. This was the most technically sophisticated version, and it underperformed the simplest one. We spent hours trying to understand why. The answer, when it came, was obvious. The GIF was too clever. It added motion that competed with the play button for attention. Users watched the animation instead of clicking the play button. The static thumbnail, by contrast, made the play button the only visual event in the image. It was a single, clear invitation.

The lesson: in email, cleverness is a tax. The simplest version often wins because it removes decisions. Every additional element is another thing the user has to process. The static thumbnail had one element: the play button. That's why it won.

Test 5: The Plain Text Link With a Play Icon

The setup. No image at all. Just a text line with a play icon character next to it, styled to look like a link. Something like: "▶ Watch the 90-second shortcut to your first win."

The screenshots. It rendered in every client. It rendered in text-only email clients, which is a category we hadn't been able to reach until this test. It was fast to load. It was small. It was, technically, the most robust version.

The numbers. Click-through rate: 5.8%. Above the baseline, below everything else.

The verdict. This was the control that proved the point. A plain link with a play icon did better than nothing, but far worse than any version with a visual play button. The image was the difference. Users in email don't read. They scan. A visual anchor—a play button shaped thing—pulls the eye in a way that text cannot. The image wasn't decoration. It was the mechanism.

The Screenshots That Taught Us the Most

We didn't just look at the numbers. We studied the renders. Three details changed how we now design every video email.

The play button size. Small play buttons look tentative. They signal "optional." Large play buttons look like an invitation. They signal "watch this." We nearly doubled the size of ours, and click-through went up by 22% in the next test. The play button is not a UI element. It's a promise.

The first frame. The static image is the poster. In the winning version, the poster image was a screen capture of the empty dashboard—the same screen the user would see if they clicked into the product. That choice created continuity. The user wasn't clicking a marketing video. They were clicking an answer to the exact thing they were looking at. When we later tested a poster image of a person's face instead of the dashboard, clicks dropped. The product screen outperformed the human face. That surprised us.

The line of text. "Watch the 90-second shortcut to your first win" outperformed "Watch our onboarding video" by 61%. The word "shortcut" and the phrase "first win" did the work. One promised speed. One promised outcome. "Onboarding video" promised a task. Users don't want tasks. They want shortcuts.

The Framework We Now Use for Video in Email Marketing

After four months of testing, we wrote down the rules. Here's what we do every time.

Rule one: Never embed HTML5 video. Too many clients strip it, and Gmail may route you to spam. The cost of the few Apple Mail users who'd see it inline is not worth the cost of the Gmail users who'd see nothing.

Rule two: Use a static thumbnail with a play button, linking to a landing page. This renders everywhere. It looks like video. It behaves like a link. It works.

Rule three: The poster image should show the product screen, not a face, not a logo. Continuity between the email and the product is the biggest driver of clicks. The user should feel like the video is showing them the exact thing they're confused about.

Rule four: The text should promise speed and outcome, not content. "Shortcut to your first win" beats "onboarding video." "90 seconds" beats "a few minutes." Specific numbers and specific outcomes beat generic descriptions every time.

Rule five: Design the play button like a promise, not a UI element. Large. Centered or slightly off-center. Brand-colored. Unmissable.

Rule six: Link to a landing page where the video autoplays muted. Do not link to a page with a video player the user has to click. Every click between the email and the answer is a chance to lose them.

Rule seven: Don't put the video in email one. Email one is a receipt. Email two, sent the day after signup, is where the stuck user lives. That's where the video goes. That's where it works.

Rule eight: Measure clicks, not plays. The play happens on the landing page. The email's job is the click. Optimize for the click.

Rule nine: Track the full chain. Click-through rate is not the outcome. Activation is the outcome. Churn is the outcome. Use your product analytics to link the email click to the activation event. That's how you prove the email worked.

Rule ten: Test the thumbnail, not the video. The video is fixed. The thumbnail is the variable. Different play button sizes. Different poster images. Different lines of text. The variation that wins on click-through is the variation that wins on activation—we tested it, and the relationship held.

What Didn't Work in the Emails

Not every idea landed. Here are the ones we killed.

The link to a hosted video page. Users had to click, then click again to start the video. Click-through was fine. Completion rate on the landing page was terrible. Every extra click is a leak. We now autoplay on arrival.

The video in email one. The receipt email is not the intervention email. Users open email one, scan it, and move on. Video there was ignored. Email two is where the stuck user lives. That's where the click happened.

The six-minute version. We tested a longer video on the landing page. Completion rate dropped sharply. Users in the day-two email do not have six minutes. Ninety seconds is the ceiling. Sixty is better.

The branded intro. Every early version of the video opened with our logo. Users clicked away. The video has to open with the user's problem, not our brand. This is true in email, in-app, and everywhere else. LeoStudio told us this on the first call, and it remains the single most important production rule in the whole system. You can read how they think about openings and the user's first three seconds throughout leostudiohq.com—it's the reason their videos earn attention before they ask for it.

The subject line that referenced the video. "Watch our new onboarding video" underperformed "A 90-second shortcut to your first win" by a wide margin on open rate. The subject should promise the outcome, not the format.

The urgency tone. "You're falling behind—watch this" outperformed nothing. Churn went up slightly in the test group. Day-two users are already anxious. Adding pressure makes them leave. The gentle version always wins.

The Numbers, in Full

Here's the full picture across the four months.

Baseline text email, click-through rate: 3.1%. Static thumbnail with play button: 18.4%. That's a 493% increase. Seven-day activation rate for users who clicked the winning email: 41%, up from 22% for the control. Sixty-day churn among new signups dropped 34% when the winning email replaced the text email in the welcome sequence. Trial-to-paid conversion moved from 11% to 17%.

The number that surprised us most was the retention multiplier. Users who clicked the video email were 2.6x more likely to still be active at sixty days than users who received the text email. That's not a click-through effect. That's a composition effect. The email was bringing the right users into the product faster, and those users stayed.

The full picture is in the dashboard, not the email. That's the discipline LeoStudio brought to the project from day one—the email is never the point. The downstream outcome is. You can see that thinking in how they approach every video project at leostudiohq.com, and it's the reason we don't celebrate click-through anymore. We celebrate activation.

The Final Word

Video in email marketing isn't about making a video play inside an inbox. It's about making a user click the thing that looks like a video. The technical reality of email clients makes the inline approach fragile and inconsistent. The static thumbnail with a play button is the workhorse. It renders everywhere. It looks like video. It behaves like a link. And when it links to a landing page with the right 90-second video, it changes the entire onboarding funnel.

Our click-through went from 3.1% to 18.4%. Our churn dropped 34%. And the mechanism was embarrassingly simple—a JPEG that looks like a video player, a large play button, and a line of text that promises a shortcut to a win.

The video we used on the landing page was the one we built with LeoStudio. Ninety seconds. One action. One win. Silent-friendly. Mobile-first. It was the same video that sits in the empty dashboard and the inactivity modal. Same asset. Different moment. That's the whole system—one video, many moments, all of them designed to meet the user where they're stuck.

If you're trying to use video in email marketing, don't start with the video. Start with the thumbnail. Go to leostudiohq.com and look at how LeoStudio designs for the moment before the play. Study their openings, their play-button thinking, their refusal to overload the first impression. Then design your thumbnail. Then write your subject line. Then link to the video. Tell them the SEO guy sent you. Tell them you already know the email's job is the click, not the play. They'll know exactly what you mean.