Taller mobile product images with swipe: +4.7% CR, ATC flat
Test run byClean CommitCRO agency
Commentary byLiftArchiveOur analysis, not theirsA taller mobile product image area with minimal arrows, dots and swipe support lifted conversion rate 4.7% and orders 4.6% across 69,560 mobile visitors.
Clean Commit ran this test for an anonymized Shopify store and published it in its A/B test library.
We count it as inconclusive: none of the moves were significant, and add-to-cart rate, the metric the test targeted, was flat.
- Add-to-cart rate (the target): -0.5%, with a 45.1% probability of beating the original. Flat.
- Conversion rate: +4.7%, and orders +4.6%. A positive signal, but not significant.
- Revenue per visitor: +3.2%, smaller than the conversion lift because average order value dipped 1.4%.
The change
The mobile gallery gets taller with swipe, minimal arrows and dot indicators.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The store's original product image carousel on mobile.
Variant
The image area was made taller, the controls were swapped for minimal arrows and dot indicators, and swiping between images was added.
Why it likely came out this way
Our reading of the result, not the practitioner's claim.
- Bigger images and swipe are what mobile shoppers expect, so the change may have removed small annoyances rather than changed decisions.
- Shoppers added to cart at the same rate, so the images probably didn't change whether people wanted the product.
- The gain in orders without a gain in add-to-cart may be noise, since neither was significant.
Caveats: Not statistically significant on any metric, and the target metric was flat. Mobile only; duration was not shared.
Who ran it
Clean Commit ran this test for a Shopify store (anonymized) and published the results (Clean Commit A/B test library). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Clean Commit →
How to run this test on your store
- Hypothesis
- If we make mobile product images taller and add swipe with simple controls, then add-to-cart rate will rise because shoppers can judge the product more easily.
- Primary metric
- Mobile add-to-cart rate
- Guardrails
- Mobile conversion rate
- Average order value
- Page load time
- Who should test it
- Stores whose mobile gallery is small, hard to swipe or uses clunky controls. If your carousel already works like a standard app gallery, expect little change.
Questions
Do bigger product images increase add-to-cart on mobile?
Not in this test. Add-to-cart was flat, though conversion showed a non-significant lift.
Should mobile product galleries support swipe?
Yes, most shoppers expect it. Just don't expect swipe alone to lift sales much if your gallery already works well.
What should I watch when making images taller?
Check that price and the add-to-cart button aren't pushed too far down, and that larger images don't slow the page.
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