Product images vs product descriptions is not a fair fight, and most sellers back the wrong side. Buyers scan the photos first, decide from them, and only drop into the text when the image leaves a question open. When that question is "how big is this?", the description rarely gets the chance to answer.
Here is what the research actually shows, why a spec table cannot carry size on its own, and how to make one annotated image answer the size question before a buyer has to ask.
Product images vs product descriptions: what the data says about where buyers look
Baymard Institute's product-page testing found that 42% of users try to grasp the size of a product through the product page images — and when there is no "in scale" image, that task becomes needlessly difficult. The same body of testing found users consistently rely on zooming into images to inspect fine detail.
That single number reframes the whole listing. Nearly half your visitors are trying to answer a physical, spatial question — how big is this, will it fit — using pictures. A spec table is not where they look first. It is where they go when the picture fails.
Scale that against the cost of getting it wrong. The National Retail Federation's 2025 Retail Returns Landscape projected roughly $850 billion in returned merchandise — about 15.8% of retail sales, and 19.3% of online sales. Fit and size stay the dominant driver in the categories where returns hurt most.
| Signal on the page | What it answers | What buyers actually do with it |
|---|---|---|
| Main image | "What is this?" | Decides in under 2 seconds whether to keep looking |
| Image with dimensions marked | "How big is this, exactly?" | Reads the number off the picture |
| Spec table (text) | "What is the spec?" | Consults only when the image left a gap |
| Description paragraph | "Why should I care?" | Skimmed, often after the decision |
The order matters. If the size lives only in the third row, you are asking a buyer to stop, find the table, parse a column, and convert units — mid-scan. Most will not.
Why a spec table cannot carry size on its own
A spec table is a reference, not an answer. It lists numbers in rows, which is exactly what a buyer wants once they already know the question. But on a listing page the buyer's question forms while they are looking at the product, and the fastest answer is the one attached to the product.
There are two buyers on every product page, and they need the same thing in different forms:
- The scanner never reads the description. They look at the image, judge scale against the frame, and either trust it or bounce.
- The checker wants the exact figure, in their unit, before they commit. They will find a table — if you made one — but they would rather not have to.
An image with the dimensions marked serves both at once. The scanner gets a visual sense of proportion; the checker reads the number without leaving the picture. A table serves only the second, and only if they scroll.
The trap: an un-annotated photo is just another description
Putting a product on a white background does not make its size obvious. This is the part sellers miss. Baymard's finding is specifically about in-scale images — a product shown with a recognizable reference to real-world size, or with the dimensions stated on the image. A clean photo with no scale cue tells the buyer what the product looks like, not how big it is.
That is why "we already have good photos" and "buyers still return for size" are not a contradiction. Good photography answers appearance. It does not answer measurement.
This is also where AI image tools hit a wall. They can restyle a background, relight a scene, or drop a product into a room — but they generate an image, not a measurement. A number an AI paints onto a photo looks plausible and can be wrong, which is worse than no number at all. Showing a size requires the size to be known: a measured dimension locked to the actual edges of the product, not a generated guess.
How to make one image answer the size question
You do not need to annotate everything. You need the two or three measurements buyers actually ask about, marked clearly on a photo they will look at anyway.
- List the three questions your inbox gets: overall length? seat height? depth? internal capacity?
- Measure the real product — not the catalogue spec, the unit as shipped.
- Mark each dimension on the image, snapped to the actual edges so the line matches the measurement.
- Label in both units your market uses (cm and inches for most cross-border listings).
- Keep the type large enough to read on a phone thumbnail, not just on desktop.
- Export at the platform's required size so it stays sharp — Amazon's image guide requires at least 500 px on the longest side and enables the zoom function at 1,000 px or more.
- Put the annotated image early in the gallery, before the lifestyle shots.
A practical route for the marking step: software that locks the measured dimension onto the photo — snap the line to the product's edge, type the real number, export at the platform's spec size. The measurement stays attached and accurate instead of being redrawn by hand in a generic photo editor, where resizing the canvas silently changes what the line claims. You can see the format in this annotated furniture listing example, and the same spec-image approach works for a product spec sheet attached to a quotation. For what to include and in what order, see how to display product specifications and what makes a spec sheet buyers actually read.
Where the description still earns its place
None of this argues for deleting your copy. Product images vs product descriptions is a division of labour, not a winner-takes-all contest. The description does jobs an image cannot:
| Job | Best format |
|---|---|
| Show exact size | Annotated image |
| Show proportion and scale | In-scale image (reference object or context) |
| Explain material, care, compliance | Description / spec table |
| Answer "which size should I pick" | Size chart plus annotated image together |
| Handle objections (warranty, shipping) | Description, FAQ, or spec sheet |
The failure mode is not "too much text" or "too many images." It is a size question that only text answers, on a page where buyers answer with their eyes.
Quick reference
- Buyers judge size from images, not descriptions — 42% of users try to read size off the product images (Baymard Institute).
- A clean photo is not an in-scale photo; without a reference or a marked dimension, scale stays ambiguous.
- Mark two to three real measurements on one image, in both units, early in the gallery.
- Keep the text for material, care, and compliance — and let the image carry size.
FAQ
Do buyers read product descriptions?
Some do, but they read images first and more often. Baymard's testing found 42% of users try to determine product size from the page images, which makes size a visual question for a large share of visitors. Descriptions still matter for material, care, and compliance; images decide whether the size question gets answered at all.
What is an in-scale product image?
An in-scale product image is a photo that gives the viewer a real-world size reference — either a recognizable object next to the product (a hand, a coin, a phone) or the dimensions marked directly on the image. Baymard identifies it as the fix for the 42% of users who struggle to judge size from product photos alone.
Why do customers still return items when the size is listed?
Because the size is listed in a place they did not read. A measurement buried in a spec table or a paragraph competes with a visual first impression, and when the two disagree the buyer trusts what they saw. NRF's 2025 data put 19.3% of online sales coming back, with fit-driven categories leading that. Marking the real measurement on the image closes the gap between what they saw and what arrived.
Can I use AI-generated images to show product size?
AI image tools can restyle or recontextualize a photo, but they generate pixels rather than measure them — so any size they render is an invention, not a measurement. Use them for backgrounds and styling if you like; put the actual dimensions on with a tool whose geometry is deterministic, so the number on the image matches the number on the product.
How many product images should show the size?
At least one, placed early. One clearly annotated image that answers the top two or three measurements does more than five lifestyle shots that show proportion only. If you sell several sizes or configurations, annotate the ones buyers ask about most.
Sources & References
- Baymard Institute — Product Page UX: Provide at Least One "In Scale" Image — the 42% finding and why scale cues matter.
- Baymard Institute — Ensure Sufficient Image Resolution and Zoom — users' reliance on zoom to inspect fine detail.
- Baymard Institute — Product Page UX Best Practices 2026 — current product-page benchmark data.
- National Retail Federation — 2025 Retail Returns Landscape — roughly $850B returned; 15.8% overall and 19.3% online return rates.
- Amazon Seller Central — Product image guide — 500 px minimum on the longest side; zoom enabled at 1,000 px or more.
- Baymard Institute — Include Descriptive Text or Graphics for Sizing — pairing images with on-image size information.