How to show product size in photos
Put something people already know the size of in the frame: a hand, a person, a room or a familiar object, and back it with a dimension graphic in a secondary image. In Baymard Institute’s testing, 42% of shoppers tried to judge size from product photos, and 28% of 60 large retailers had no in-scale image. With AI, set the scale in the references, then measure it.
Why size needs its own photo
Shoppers use photos to judge size, and without help they judge it badly. In Baymard Institute’s product page testing, published in 2017, 42% of users tried to work out a product’s size from its images. Where no image showed scale, people misjudged size, passed over products that would have suited them, and some left the site. One tester called a desk "huge" and preferred another that was only about 20% narrower, with the same height and depth.
A picture that overstates size carries legal risk as well. Buyers sued Burger King in 2022, alleging its ads made burgers look about 35% bigger with more than double the meat. The claims survived two motions to dismiss before the case was dismissed with prejudice in January 2026, after both sides agreed to end it. The details are in AI food photography.
Six ways to show size
| Method | Best for | How to do it | Watch for |
|---|---|---|---|
| A hand holding it | Cosmetics, supplements, snacks, small gadgets | A real hand, a natural grip, the product at its true size in the hand | AI hands drawn too big or too small for the product |
| On a person | Anything worn or carried: bags, jewelry, clothing | Show enough of the person to judge, and state their height | A model whose height nobody wrote down |
| In its room or place | Furniture, appliances, grills, planters | The product where it is used, with everyday objects nearby | Rooms drawn larger than real rooms, which shrink the product |
| Next to a familiar object | Kitchen tools, gadgets, home goods | One object your buyer knows, such as a mug beside a kettle | Props the model resizes to look pleasing |
| A dimension graphic | Any product whose size matters to the buyer | Lines and numbers in cm and inches over a clean shot, in a secondary image | Numbers drawn by the model; set them in a design tool |
| Sizes side by side | Ranges, such as 30 ml and 100 ml | The real products photographed together at one distance | Separate renders scaled to fit a layout |
Baymard’s testers used cupcakes placed beside a stand mixer to judge the mixer’s size, because they knew roughly how big a cupcake is. Choose the object your buyers know best, and use one per image.
Where marketplaces let you put size graphics
On Amazon, the main image has to show the product on pure white (RGB 255, 255, 255), and an Amazon staff summary of the photo standards, posted on its seller forums in 2026, says to avoid "text, graphics, logos, watermarks, or promotional messaging" on it. Put dimension graphics in the secondary images and in A+ Content; see Amazon product image requirements and Amazon A+ Content image sizes.
Many stores skip this. Baymard found in 2018 that 52% of large sites used no descriptive text or graphics on product images for their best sellers, and its testers said of marked-up refrigerator photos, "I like the dimension picture." For furniture and larger goods, a 3D model lets shoppers place the product in their own room: Shopify accepts GLB and USDZ models up to 500 MB, and shoppers can view them in their space through the phone’s camera.
How AI gets scale wrong
A reference photo carries no size. A 5 cm lip balm and a 50 cm vase can fill a tight packshot the same way, and the model has nothing else to go on, so it sizes the product to suit the scene. The usual results:
- The product grows to fill the space the composition gives it.
- Props shrink or grow to look pleasing beside it.
- A wide lens and a low camera exaggerate size, as they do in real photos.
- A generated hand comes out larger or smaller than a real adult hand around the real product.
- Two sizes of the same product in one scene drift toward one size.
The fix is to give the model size facts it can see and read:
- Add a scale reference that you took: the real product in a real hand, or beside an object you measured.
- Write the dimensions and a comparison into the prompt, such as "a 7 cm tall jar, half the height of the 14 cm vase beside it."
- Keep the camera near a shopper’s eye height with a normal lens, around 50 mm on full frame, unless the shot is a deliberate hero.
- Render one size per image, and build size comparisons from real photos.
How to check scale in an AI image
Check scale with arithmetic. You need one object in the image whose real size you measured yourself, standing beside the product at the same distance from the camera.
- Measure the product and the reference object in pixels, in the same direction: height against height, width against width.
- Divide the product’s pixels by the reference’s pixels.
- Divide the product’s real size by the reference’s real size.
- If the two ratios differ by more than you would accept in a real photo, remake the image with the size stated in the prompt.
Real sizes: jar 10 cm tall; mug you measured 9.5 cm tall. Real ratio: 10 / 9.5 = 1.05 In the render: jar 520 px tall; mug 380 px tall. Image ratio: 520 / 380 = 1.37 Result: 1.37 / 1.05 = 1.30, so the jar looks about 30% taller than it is. Remake with: "a 10 cm tall jar, slightly taller than the 9.5 cm mug beside it"
Perspective breaks this check when the two objects sit at different distances from the camera, so compare only things standing side by side.
A scale shot list for one product
1. In hand: a real hand, a natural grip, the product at true size. Secondary image. 2. In use: the product where it lives (bathroom shelf, kitchen counter, desk) with one everyday object beside it. 3. Dimension graphic: a clean packshot with height, width and depth in cm and inches, set in a design tool. Secondary image. 4. Size range: every size you sell, photographed together at one distance. Checks: measure one known object in each image. For worn items, state the model’s height and the size worn.
For where these sit among the other images on a product page, see what product photos an online store needs.
Questions people also ask
- Is a dimension graphic enough on its own?
- It helps, but numbers alone are hard to picture. Baymard’s testers struggled to picture ounces and cubic feet, and understood size better from an in-scale image. Use the graphic for exact numbers and a photo with a hand, a person or a room for the feel of the size.
- What object should I use for scale?
- One your buyers see every day and know at a glance, in the setting where the product is used: a mug beside a kettle, a phone beside earbuds, a hand around a jar. Coins and banknotes differ by country, so they work less well for stores that sell abroad.
- Can AI make the dimension graphic?
- It can draw lines and numbers, but it may misspell or misplace them. Set dimension text in a design tool over a clean image, where you control every digit. See how to get text right in AI images.
Where Overs fits
Overs can cast a person for products that are held, so in-hand shots use the same approved model across a set. It does not add dimension graphics or measure scale: set size text in a design tool and check each image against the real product.
Free for 40 photos a month. The AI that makes the photos is billed separately, on your own key, with no markup from Overs.
Sources
- Baymard Institute: Product page UX, all products need at least one ‘in scale’ image (May 30, 2017)
- Baymard Institute: Product page UX, include descriptive text or graphics for some product images (Nov 28, 2018)
- Amazon Seller Forums: Product photography standards, staff post (2026)
- Shopify Help Center: Product media types (3D models)
- CourtListener: Coleman v. Burger King Corporation, No. 1:22-cv-20925 (S.D. Fla.), docket
- U.S. District Court, S.D. Florida: Order of dismissal, Coleman v. Burger King (Jan 28, 2026)