Explainer Video Length & Aspect Ratio: What Actually Works

Length and ratio are platform decisions

The right length for an explainer video is not a single number — it is a function of where the video plays and what it asks the viewer to do. A 90-second video on a pricing page and a 15-second video in a feed can both be correct, and both can be wrong if mismatched to their context.

This guide breaks down the two decisions — length and aspect ratio — by platform and use case, using the patterns we see perform best.

How long should it be?

Landing page and website explainers: 60 to 90 seconds. Long enough to establish the problem, show the proof, and land the offer; short enough that most viewers finish. Watch time drops sharply past two minutes on a website.

Paid social and feed ads: 15 to 30 seconds. The first three seconds carry the entire burden of attention. If the video cannot state its value in 15 seconds, cut the script rather than extend the video.

Product walkthroughs and feature deep-dives: 2 to 4 minutes. These are watched by an audience that has already opted in, so a longer runtime is acceptable — but only if every section earns its place.

Aspect ratio by destination

16:9 (landscape) is the default for website embeds, YouTube, and email. It reads as professional and gives typography room to breathe. Use it wherever the viewer is sitting and has chosen to watch.

9:16 (vertical) is mandatory for Stories, Reels, Shorts, and TikTok. Design for it natively rather than cropping a landscape video — cropping almost always loses the focal point and the on-screen text.

1:1 (square) performs well in-feed on platforms that support it, because it occupies more screen height than landscape without demanding a full vertical commitment. It is a strong middle ground for in-feed ads.

Design once, deliver three times

The most efficient workflow is to design the master in 16:9 and plan the vertical and square crops from the start. Keep critical text and the focal element inside a center-safe zone so that all three ratios stay legible without re-animating scenes.

If a scene only works in one ratio, it is usually a sign the composition is too busy. Simplify until it reads in the tightest crop, then let the wider ratios breathe around it.

Captions are not optional on mobile

The majority of mobile video views begin muted. Burned-in captions ensure the message lands whether or not the viewer turns sound on, and they improve both watch time and recall. Style captions to match the brand rather than dropping in default player subtitles.

Pair captions with strong sound design so that viewers who do enable audio get a richer experience. The video should work silent and reward sound.