Hover to swap product images on desktop: transactions up
Test run byPrismflyCRO agency
Commentary byLiftArchiveOur analysis, not theirsLetting desktop shoppers change the main product image by hovering over a thumbnail, instead of clicking it, raised transactions and conversion rate, though no figure was shared.
Prismfly ran this A/B test for fashion retailer Princess Polly.
It was one of 56 tests run over 17 months across the US and Australian sites.
- Transactions and conversion rate: Prismfly called the increase substantial but gave no number.
- The test ran on desktop only.
- Across the wider program, 24 of 56 tests had a positive revenue impact, a 43% win rate.
The change
Desktop gallery thumbnails switch the main image on hover, not click.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
On desktop product pages, shoppers had to click a thumbnail to change the main product image.
Variant
Hovering over a thumbnail swapped the main image, so shoppers could browse photos without clicking.
Why it likely won
Our reading of the result, not the practitioner's claim.
- Fashion shoppers look at many photos before buying. Fewer clicks make it faster to see fit and detail.
- Prismfly's session recordings in Microsoft Clarity pointed to image browsing as a friction point.
- Hover is a familiar pattern on desktop, so it likely felt natural rather than surprising.
Caveats: No numbers were shared for this test, so the size of the lift is unknown. It applied to desktop only, where hover exists.
Who ran it
Prismfly ran this test for Princess Polly and published the results (Prismfly case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Prismfly →
How to run this test on your store
- Hypothesis
- If we swap the main product image on thumbnail hover instead of click, then transactions will rise because shoppers can view more photos with less effort.
- Primary metric
- Desktop conversion rate
- Guardrails
- Add to cart rate
- Product image views per session
- Page load time
- Who should test it
- Apparel and other visual categories with several photos per product and meaningful desktop traffic. It does nothing on mobile, so skip it if almost all your traffic is on phones.
Questions
Should product thumbnails change on hover or on click?
On desktop, hover saves a click and lets shoppers scan photos faster.
Keep click or swipe working too, since touch screens have no hover.
How much did hover thumbnails lift Princess Polly's conversion rate?
Prismfly reported a substantial increase in transactions and conversion rate but did not share a figure.
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