Quick Summary
A short looping clip can explain a product faster than three paragraphs of copy. The catch is that video is the heaviest asset you can put on a page, and AI generators hand you files sized for social platforms, not for the web. This post covers the export settings I use, the autoplay rules that catch people off guard, and a workflow that gets a generated clip onto a landing page without wrecking its load time.
Why This Matters
I ship the occasional promo clip for small SaaS projects, and for the past few months most of those clips have come from a free AI video generator instead of a camera or an editor timeline. The generation part is the easy bit now. What actually decides whether the clip helps or hurts the page is a row of boring decisions: resolution, file size, autoplay behavior, and where the video sits in the DOM. Get those wrong and your Lighthouse score tells the story.
Key Takeaways
- Generate at the resolution you will display, then compress again before shipping.
- Muted autoplay works in every current browser. Unmuted autoplay does not, and that is fine for a landing page.
- Lazy-load anything below the fold and always ship a poster frame.
- Test on throttled mobile before trusting your desktop preview.
Pick the Export Settings Before You Generate
It sounds obvious, but decide the slot first. A hero clip that sits next to a headline is usually fine at 1280 pixels wide, while a background loop can often live at 960 or even 720 and still look sharp once you overlay text and a gradient. Generating at 1920 because it is the default just means you pay for pixels the layout will crop away.
Keep the clip short as well. Four to six seconds loops cleanly. Most people watch a hero clip for about two seconds before they start reading, so anything past the ten second mark is weight with no audience. If the generator lets you pick a frame rate, 24 fps reads as filmic and shaves a bit off the file compared to 30.
Autoplay Rules You Will Hit
Every current browser allows autoplay only when the video is muted. That is not a limitation for a landing page clip because the sound would be autoplaying audio, which nobody wants anyway. So the pattern is simple: autoplay muted loop playsinline, and no controls. The playsinline attribute matters most on iOS Safari, where a missing attribute historically meant the video would take over the full screen on tap.
Give the video a poster image too. If the connection is slow, the poster paints immediately and the page does not flash an empty black rectangle while the video buffers. The poster can be a frame you like from the generation run, exported as a plain JPG.
Keeping the Page Fast
Two habits cover most of it. First, preload="none" or preload="metadata" on anything that is not the hero, wrapped in the loading="lazy" pattern you already use for images. Second, compress the file itself. I run generated clips through a standard compression pass before upload and it is common to see a 40 to 60 percent reduction with no visible change at landing page sizes. If the clip is a background loop with no close-up human faces, cranking the compression a notch harder is usually invisible.
One more check: open the page with the network throttled to a slow 4G profile and watch what happens in the first three seconds. If the layout jumps when the video swaps in from the poster, reserve the space with an aspect-ratio wrapper, the same trick you use for images.
Where the Video Earns Its Place
A clip works hardest where the product does something visual and quick. An animation of a dashboard rearranging itself, a before-and-after of a photo tool, a mock device screen scrolling through a feed. It works least as decoration. If you cannot say what the clip demonstrates, it is a background image with a file size problem.
For promo clips in this style I keep the whole loop in one tool, from prompt to export, and the AI video generator I run on the regular side of my workflow covers it without a subscription in the way.
Frequently Asked Questions
Should I use MP4 or WebM?
MP4 with H.264 is the safe default because every browser and CDN handles it. WebM with VP9 or AV1 can be smaller, and the modern move is to ship WebM with an MP4 fallback, but for a single hero clip the difference rarely justifies the extra file.
Do generated clips hurt SEO?
Video itself does not hurt rankings. A slow page can. Treat the clip like any heavy asset, measure Core Web Vitals after you add it, and the two stop being in conflict.
How long should a hero clip be?
Four to six seconds, cut so the loop point is invisible. Longer clips load more before they can start playing, and almost nobody watches past the first loop.
Conclusion
Generated video on a landing page is a packaging problem, not a generation problem. Decide the slot and resolution first, mute and loop it, give it a poster, compress it hard, and test on a throttled connection. Do that and the clip pulls its weight. Skip it and you have traded your page speed for decoration nobody asked for.
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