How to Add Size Dimensions to Product Images & Videos

Practical, seller-friendly guide to reduce returns and build trust.

This guide shows you how to add size to product images and videos using clean product dimension labels and measurement labels that look professional and on-brand. It is designed for e-commerce teams that want fewer size-related questions and higher conversion rates.

At a glance

• Best for: e-commerce sellers of physical products
• Time per SKU: 1-2 minutes for images; 2-3 minutes for video
• Outcome: consistent product image dimensions and product video dimensions across your catalog

Key takeaways

• Clear size labels reduce "How big is it?" messages and returns.
• Consistent measurement labels for photos make listings look more professional.
• A repeatable workflow helps you scale annotations across an entire catalog.

Why size dimensions matter for e-commerce

Business impact:

• Size-related returns can reach 22% in some categories.
• Clear dimension labels can reduce size-related returns by up to 40%.
• Listings with helpful visuals often see higher conversion rates.

Customer impact:

• "This seller is transparent."
• "I can picture how big this is."
• "I feel confident placing the order."

Before you start (prep checklist)

1) Strong base assets

• Sharp focus and even lighting
• Full product visible, not cropped
• Angles that show width, height, and depth

2) Accurate measurements

• Measure length, width, height (or diameter for round items)
• Use one unit system consistently
• Double-check values before publishing

3) Measurement rules

• Decide units by market (inches vs centimeters)
• Set rounding rules (e.g., 12 in vs 12.0 in)
• Define how to measure flexible items (bags, apparel)

4) The right tool

Choose a size annotation tool that keeps labels clean and consistent. If you need product video dimensions, pick a video annotation tool that supports timed labels.

• Dimension lines and arrows
• Custom fonts and colors
• Export in PNG/JPEG and MP4/WebM

Step-by-step workflow (images and videos)

These steps work for images and videos. For videos, you will also choose when each annotation appears.

Step 1: Upload a clean product image or video

Goal: start with a clear, full product view.
Do this:

• Use a straight-on view (front, side, or top)
• Keep the background clean
• Use stable, sharp video footage

Common formats:

• Images: JPEG, PNG, WebP
• Videos: MP4, WebM, MOV

Step 2: Choose a dimension style

Goal: match your brand and product category.
Good options:

• Simple arrows for a clean, modern look
• Bracket lines for technical items
• Filled labels for high-contrast visibility

Step 3: Draw measurement lines

Goal: place lines that read clearly at a glance.
Do this:

• Keep lines outside the product when possible
• Align multiple lines for a neat grid
• Leave breathing room around labels

Step 4: Enter the measurement value

Goal: show the exact number and unit.
Do this:

• Enter the true measurement (avoid rounding up)
• Keep units consistent across the listing
• Include both units only if your market needs it

Step 5: Match your brand style

Goal: make annotations feel premium and consistent.
Do this:

• Use high-contrast colors
• Stick to a bold, readable font
• Keep line thickness consistent across SKUs

Step 6: Add all key dimensions

Goal: answer the most common size questions.
Examples:

• Height and width for flat products
• Height, width, and depth for 3D items
• Diameter for round products
• Key fit points for apparel (chest, waist, inseam)

Step 7: Export and QA

Goal: ensure readability on mobile.
Do this:

• Preview at small sizes (phone width)
• Check for overlap on key product details
• Export at your platform's recommended resolution

Design tips that improve conversion

• Contrast is everything: light products need dark labels; dark products need light labels.
• Keep placement consistent: height on the right, width along the bottom, depth on a secondary image if needed.
• Go mobile-first: increase font size and avoid overlaps with product details.

Scale this across your catalog

• Build one template per category (font, color, line weight).
• Batch annotate by category to keep style consistent.
• Add a QA pass before upload.
• Track rules in a simple spec sheet (units, rounding, placement).

Video-specific tips

• Show dimensions when the product is stable and centered.
• Keep each label visible for 2-4 seconds.
• Use subtle fade-in and fade-out animations.
• Remember: many shoppers watch without sound.

Before and after examples

Common mistakes to avoid

Platform-specific considerations

Video format quick guide

Closing thoughts

Clear, consistent size labels turn uncertainty into confidence and reduce size-related questions before they reach your inbox. Start with a single product category, build a simple style template, and scale the workflow across your catalog.