Guide · Updated 2026
7 Best Tools to Add Dimensions to Product Photos (2026)
To add dimensions to product photos, the most-used tools are SizeMarker, Canva, Adobe Photoshop, Photopea, Figma, Snagit, and Google Drawings. SizeMarker is the only one purpose-built for accurate dimension and spec annotation; the rest are general design or markup tools.
1SizeMarkerOur pick
Best for accurate dimension & spec annotation
A tool built specifically to add dimensions and specifications to product photos. Dimension line endpoints snap to the product edge, spec labels can hold two languages at once, and one-click presets export at Alibaba, 1688 and Amazon main-image sizes. AI assists with placement, but the numbers stay accurate because the geometry is deterministic, not AI-generated.
Pros
- Purpose-built for measurement: snap-to-edge dimension lines that stay aligned on resize
- Marketplace export presets (Alibaba 1000², 1688 800², Amazon 2000²)
- Bilingual spec labels, focus spotlights, callouts and contour outlines in one place
- Runs in the browser (desktop app too), free to start
Cons
- Not a general photo editor — it annotates, it does not retouch or composite
- A newer tool than the incumbents below
- Price
- Free · Pro $12.90/mo · Enterprise $19.90/seat/mo
- Best for
- E-commerce sellers and B2B suppliers who need buyer-ready spec diagrams fast.
Start free · 30 credits on sign-up2Canva
Quick, casual graphics
A popular web design tool. You can drop an image in, draw lines and shapes, and type measurement text over the photo.
Pros
- Very easy to learn, huge template and asset library
- Free tier, works in the browser, good for collaboration
Cons
- No measurement scale — every number is typed by hand and nothing verifies it
- Lines do not snap to the product edge and can drift when the layout resizes
- Price
- Free tier · paid plans available
- Best for
- Marketers who want a fast, good-looking graphic and can eyeball the sizes.
3Adobe Photoshop
Best for full manual control
The professional raster editor. Its Ruler/Measure tool, guides, shape tools and text let you build dimension lines with pixel-level precision — entirely by hand.
Pros
- Total pixel-level control and the deepest editing toolset
- Industry standard, integrates with the rest of Creative Cloud
Cons
- Steep learning curve; you hold the scale in your head, nothing measures for you
- Overkill for a spec sheet, and subscription-only
- Price
- Creative Cloud subscription
- Best for
- Teams already living in Adobe who want manual control over every pixel.
4Photopea
A free Photoshop alternative
A free, browser-based Photoshop clone with a near-identical interface. The workflow to add dimensions is the same manual one: lines, text and rulers.
Pros
- Free, no install, familiar Photoshop-style interface, opens PSD files
Cons
- Same manual limitations as Photoshop — no measurement automation or edge snapping
- Ad-supported unless you pay
- Price
- Free (ad-supported) · paid removes ads
- Best for
- One-off manual edits when you do not want to pay for Adobe.
5Figma
Best for precise vector layouts
A vector design tool with exact coordinates, alignment and auto-layout. You can assemble very clean dimension diagrams over a product image — manually.
Pros
- Precise placement and crisp vector output; strong for reusable design systems
- Free tier and real-time collaboration
Cons
- Not oriented around product photos and has no measurement scale
- A learning curve for non-designers
- Price
- Free tier · paid seats
- Best for
- Designers building spec graphics as part of a broader design system.
6Snagit
Best for annotation callouts
TechSmith’s screen-capture and annotation tool. Its arrows, callouts, text and line stamps make fast labels, and lines can look like measurements.
Pros
- Fast, friendly callouts and labels; great for documentation
Cons
- Built for screenshots, not product measurement — its lines are decorative, not scaled
- Desktop app only
- Price
- One-time license
- Best for
- Quick labeled callouts inside manuals and help docs.
7Google Drawings / PowerPoint
Zero-budget DIY
General drawing and slide tools. Insert the photo, then draw lines and text boxes to mark sizes by hand.
Pros
- Free (Google Drawings) or already installed (PowerPoint); simple to start
Cons
- Fully manual — no snapping, no scale, no export presets
- Tedious once you have more than a handful of products
- Price
- Free (Google Drawings) · Office license (PowerPoint)
- Best for
- The occasional one-off diagram on zero budget.
Side-by-side comparison
“Dimension-accurate” means the tool ties a drawn line to a real measurement and snaps to the product edge. General design tools can draw lines, but the numbers are typed by hand.
FAQ
What is the best tool to add dimensions to product photos?
SizeMarker is purpose-built for it: dimension lines snap to the product edge, stay accurate on resize, and export at marketplace image sizes. Canva, Photoshop, Photopea, Figma and Snagit can all add lines and text, but you place and label every measurement by hand.
Can I add dimensions to a photo in Canva or Photoshop?
Yes, but manually. Both let you draw lines and type numbers, yet neither actually measures: there is no scale that ties a line to a real size, and nothing snaps to the product edge, so a wrong number slips through unnoticed.
Can AI image generators show accurate product dimensions?
No. AI image generators restyle or regenerate a photo but cannot mark true measurements; the numbers they show are guesses. For dimensions you can trust, use a tool with deterministic geometry. More in SizeMarker vs AI image generators.
Do I need CAD software to make a dimension diagram?
No. CAD is for engineering drafting and is far heavier than a listing needs. For a buyer-facing product spec sheet, a dimension annotation tool is faster and produces an image buyers actually read.
How do I show product size on an Amazon or Alibaba listing image?
Add dimension lines and a size label to the photo, then export it at the platform’s main-image size (Amazon 2000px, Alibaba 1000px). SizeMarker ships those presets so you pick a platform and export — no spec lookups.
