Comparison · 2026
Generators make it look good. Buyers also need it measured — and sent to them.
A generic AI image generator restyles or invents pixels; it has no measurement of the real object, so any dimension it draws is a guess. SizeMarker separates the two jobs: product visuals, breakdown diagrams and 3D models are generated from your photo and never carry a size claim, while dimensions and specs are annotated on the real photo with geometry that snaps to the product outline. Everything then goes on one product card a buyer can open.
| Dimension | SizeMarker | AI Image Generators |
|---|---|---|
| Primary purpose | Product presentation: spec diagram + visuals + breakdown + 3D + product card | Generating & restyling images |
| Where dimensions come from | Your measurements, annotated on the real photo, snapped to the outline | Cannot measure — any numbers are invented |
| Generated visuals | Yes — backgrounds, scenes, detail edits; product shape and proportions kept | Yes — often reshapes the product |
| Facts on the image | Materials, parameters and structure are written by you; nothing is invented | Hallucinated or decorative |
| Breakdown diagram & 3D | Built in, from the same photo | Not the job |
| Getting it to the buyer | One product card link / QR / poster / embed | A file to download |
| Marketplace export presets | Built in | Not applicable |
| Price | Free · Pro $19.90/mo | Varies by tool |
You need a product photo that shows exact width, height and depth, so buyers know what they are getting before they order — and a nicer scene shot next to it.
In SizeMarker: you annotate the real photo. Dimension lines snap to the product edge, the numbers are the ones you measured, and nothing about the product image itself changes. The scene shot comes from the same photo through Product Visuals, and neither picture claims a size it didn’t measure.
With a generic AI image generator: you can produce a beautiful scene, but ask it to “add dimensions” and it draws lines and numbers that look plausible but are invented, while often reshaping the product itself. For a listing, that is the opposite of what you want.
Generators are genuinely good at what they are built for: scenes, backgrounds and concept art. SizeMarker uses the same kind of model for its own Product Visuals, breakdown layouts and 3D — the difference is the rule around it: nothing generated ever carries a dimension, and the facts on a sheet are typed by you. Accuracy comes from annotating a real photo, and that is what the rest of the product is for.
No. They generate or restyle pixels and have no measurement of the real object, so any dimensions they display are invented. For accurate sizes, annotate the real photo with a deterministic tool.
Because it produces numbers that look right but are not measured from anything. On a listing, a wrong size drives returns and erodes buyer trust — and can breach marketplace accuracy rules.
Yes — Product Visuals (backgrounds, scenes, detail edits), breakdown layouts and 3D models are generated from your photo. The rule is that none of them carries a size claim; dimensions only ever come from annotating the real photo, and the facts on a breakdown sheet are written by you.
You can, for concept work. For anything that sells a specific SKU, keeping visuals, dimensions and the product card in one place means the picture buyers see and the numbers they read come from the same photo.
SizeMarker. Listing images with sizes must be accurate; SizeMarker annotates the real product and exports at each platform’s main-image size. A generic generator cannot guarantee the measurements.
