What’s the Best Poster Size for Advertising in the UK?

Published / Last Edit on: July 12, 2025

When it comes to creating a poster that grabs attention and delivers results, choosing the right size is just as important as the design itself. Whether you’re promoting a local event, retail sale, new product, or grand opening, your poster’s dimensions can directly impact its visibility and effectiveness.

So, what’s the best poster size for advertising in the UK? Let’s break it down.

📏 Common Poster Sizes in the UK

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Here are the most popular poster sizes used across the UK and what they’re best suited for:

Size	Dimensions (mm)	Best For
A4	210 x 297 mm	Indoor use, noticeboards, shop windows
A3	297 x 420 mm	Shop windows, event flyers, cafes
A2	420 x 594 mm	Local events, indoor retail advertising
A1	594 x 841 mm	Outdoor posters, building entrances, exhibitions
A0	841 x 1189 mm	Maximum impact, billboards, concerts, major events

💡 Pro Tip: The larger the size, the more visibility you’ll get — but always match your poster size with the location and audience distance.

Also Read : Top 5 Poster Design Mistakes to avoid in 2025

🎯 Choosing the Right Poster Size for Your Campaign

Here’s how to decide which size works best:

✅ For Local Shops or Cafés

Best Size: A3 Poster or A2 Poster
Easy to read from a short distance
Fits in most shopfronts or noticeboards

✅ For Outdoor Advertising

Best Size: A1 Poster or A0 Poster
Bold and noticeable from afar
Ideal for foot traffic and roadside views

✅ For Internal Office or Event Notices

Best Size: A3 Poster
Compact, budget-friendly
Great for team communications or small announcements

💬 Why Size Matters in Poster Printing

Readability: Small fonts on a small poster are hard to read from a distance.
Impression: Larger posters make a bigger visual impact.
Space: Consider the physical space where it will be displayed. Bigger isn’t always better if it doesn’t fit properly.