Image thumbnails on mobile product pages: +6.14% conversion
Test run byBlend CommerceCRO agency
Commentary byLiftArchiveOur analysis, not theirsAdding visible image thumbnails below the main product photo on mobile lifted conversion rate by 6.14% for children's book brand Little Bible Stories.
Blend Commerce ran this mobile-only A/B test. Revenue per visitor rose 7.09%.
- Conversion rate: +6.14%.
- Revenue per visitor: +7.09%.
- Abandoned checkout rate: -4.46%, a good sign.
- Add-to-cart rate and order value stayed flat.
- New visitors: conversion +8% and revenue per visitor +10%.
The change
Dot navigation under the mobile gallery is replaced by visible image thumbnails.
Simplified mockup drawn by LiftArchive from the shared screenshots.
Control
The mobile product gallery used small circles to move between images, so shoppers could not see what each image showed before tapping.
Variant
A row of image thumbnails appeared below the main product image on mobile, showing all available pictures at once.
Why it likely won
Our reading of the result, not the practitioner's claim.
- Heatmaps showed shoppers tapping the circles a lot, so they wanted to see more images.
- Thumbnails show what each image holds, so shoppers spend less effort exploring.
- First-time visitors who don't know the brand need visual reassurance, which fits the bigger lift for new visitors.
Caveats: Mobile only, where 92% of the brand's traffic came from. Sample size, duration and significance were not shared.
Who ran it
Blend Commerce ran this test for Little Bible Stories and published the results (Blend Commerce A/B test). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on Blend Commerce →
How to run this test on your store
- Hypothesis
- If we show image thumbnails under the main product image on mobile, then conversion will rise because shoppers can see all product views at a glance.
- Primary metric
- Conversion rate
- Guardrails
- Add-to-cart rate
- Page load time
- Revenue per visitor
- Who should test it
- Mobile-heavy stores whose galleries rely on dots or swipes, especially where the inside or detail of a product matters. If you only have one or two images, thumbnails add little.
Questions
Are thumbnails better than dots on mobile product galleries?
In this test, yes. Thumbnails lifted conversion 6.14% because shoppers could see each image before tapping.
Do product image changes affect add-to-cart rate?
Not here. Add-to-cart stayed flat, but more shoppers who added items went on to finish checkout.
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