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Retail media ad specs – the new battleground (2025 update)

updated September 2025

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Why this page exists

 

The shelf used to be cardboard and steel. Now it’s pixels and algorithms.

 

Retail media is exploding. Amazon, Walmart, Target, Carrefour, Tesco, Zalando — they’re not just retailers anymore, they’re media platforms. By 2025, retail media spend will pass TV in some markets.

 

That’s great for retailers. For brands, it’s chaos.

 

Every retail media network (RMN) invents its own formats, its own image rules, its own file quirks. Which means every campaign needs a new round of resizing, re-exporting, and late-night “does this fit?” moments.

 

This page is here to kill that chaos. It gathers the core retail media ad specs in one place — so you can launch without guessing.

 

And more importantly: it’s proof that specs shouldn’t be scattered PDFs. They should live in a system that outputs them automatically.

Amazon Ads

 

Sponsored Products

 

  • Size: 1000 × 1000 px (1:1)

  • Max 2MB JPG or PNG

  • Minimum 72 DPI

  • White background required

 

Sponsored Brands banner

 

  • Size: 1200 × 300 px (4:1)

  • Max 2MB JPG or PNG

  • Headline limit: 50 characters

 

Sponsored Display

 

  • Sizes: 300 × 250 px, 160 × 600 px, 300 × 600 px

  • Max 150KB JPG, PNG, or GIF

  • Dynamic resizing may apply

Walmart Connect (US)

 

Search banner

 

  • Size: 970 × 250 px (3.88:1)

  • JPG or PNG

 

In-grid tile

 

  • Size: 300 × 250 px (1.2:1)

  • JPG or PNG

 

On-site display

 

  • Sizes: 728 × 90 px, 300 × 250 px, 160 × 600 px

  • JPG or PNG

Target Roundel (US)

 

Homepage banner

 

  • Size: 970 × 250 px

  • JPG or PNG

 

Search banner

 

  • Size: 300 × 600 px (1:2)

  • JPG or PNG

 

Video ads

 

  • Size: 1920 × 1080 px (16:9)

  • MP4 format

  • Max length: 30 seconds

​

Carrefour Links (EU)

 

Banner

 

  • Size: 970 × 250 px (3.88:1)

  • JPG or PNG

 

Sponsored tile

 

  • Size: 300 × 250 px (1.2:1)

  • JPG or PNG

Tesco Media (UK)

 

Banner

 

  • Size: 970 × 250 px

  • JPG or PNG

 

Sponsored tile

 

  • Size: 300 × 250 px

  • JPG or PNG

Zalando Marketing Services (EU)

 

Brand banner

 

  • Size: 1200 × 300 px (4:1)

  • JPG or PNG

 

Sponsored tile

 

  • Size: 1080 × 1080 px (1:1)

  • JPG or PNG

Why this matters

 

Retail media is the fastest-growing ad channel in the world. But the real bottleneck isn’t inventory. It’s creative supply.

 

Every RMN means new specs. New assets. New headaches. Multiply that across 10 retailers and 15 markets, and your brand team is drowning in production work.

 

The fix isn’t another spreadsheet of dimensions. It’s a supply chain that knows the rules and outputs compliant assets automatically — whether it’s Amazon in the US or Carrefour in France.

 

That’s how you scale without chaos.

 

 

Next steps

 

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