Not sure what size poster you need? Whether you're filling an empty corner or creating a striking feature wall, choosing the right size can completely transform a space. Get it right, and your art feels perfectly at home. Get it wrong, and even the best work can feel out of place.
That's why we've put together this guide. At uncapd, we offer six custom poster sizes, and in this guide we will explain where each one works best, and help you choose the perfect custom print for your space.
Related: Where to Print a Custom Poster for Your Wall?
Understanding Poster Dimensions
Poster sizes are usually described by both their ratio and actual measurements. At uncapd, we stick to standardised formats (think A4, A3, A2), which makes it simple to plan. Each size follows a consistent aspect ratio, so whether you're printing a portrait or landscape composition, your artwork stays properly proportioned.
Compact Spaces - Regular A4 and Medium A3
Not every wall needs a statement piece. Our Regular A4 (21 × 30 cm) and Medium A3 (30 × 42 cm) sizes offer the perfect balance of impact and flexibility.
A4 posters work well on shelves, above desks, or clustered in small gallery layouts. They're intimate without feeling cramped. If you're after something with a little more presence, Medium A3 strikes a great middle ground. It's large enough to stand out on its own, yet compact enough to fit comfortably in smaller rooms. Both sizes are affordable to print, and a great choice when you want your artwork to complement the space rather than dominate it.
The Sweet Spot - Large A2 Posters
Large A2 (42 × 59 cm) sits comfortably in that goldilocks zone - it's substantial enough to make a real visual statement without overwhelming most rooms. Hang it above a sofa, or as the centrepiece of a gallery wall and it commands attention without screaming. For many people, A2 is the first size they reach for, and for good reason.
This size works brilliantly for:
- Living rooms and lounges - Big enough to be a focal point without dominating the space
- Bedroom feature walls - Creates impact above a bed or beside a window
- Home studios and offices - Professional enough for a work environment, personal enough for creative spaces
- Hallways and stairwells - Fills wall space effectively without taking up the whole corridor
Many customers also pair multiple Large A2 prints together for a striking gallery-wall effect. The dimensions are forgiving enough that you can cluster them without looking chaotic.
Medium to Large Spaces - XL, XXL A1, and Huge
Got more wall to work with? We have you covered with three larger options.
XL (50 × 70 cm) works in generous living spaces and open-plan interiors. This is the size you choose when you want your artwork to be the first thing people notice when they walk in.
XXL A1 (59 × 84 cm) is a full-scale art installation on your wall. It's perfect for feature walls and commercial spaces.
Huge (70 × 100 cm) is cinema-poster scale. It's a rarer choice, but those with sprawling walls or high ceilings often choose Huge for maximum visual impact.
How to Measure Your Wall
Before you commit to a size, grab a tape measure and check your actual wall space. Measure the width and height of where you're planning to hang the poster, then check against our dimensions. A quick rule of thumb: your poster should take up between 50% and 75% of the available wall space for a balanced look.
If you're still uncertain, our team is happy to help. Upload your space dimensions or describe your room, and we'll suggest what works best. That's what we're here for.
Creating A Custom Poster
Creating a custom poster is straightforward. Using our online builder, you can:
- Upload your artwork - Any high-res image works. Photos, graphics, typography, whatever you want on your wall
- Preview in real time - See exactly how your design looks at your chosen size before you pay
- Adjust and refine - Reposition, rescale, or crop until it's perfect
- Get professional support - Our design team reviews every submission and offers complimentary editing to ensure print-ready quality
Production typically takes 1 to 3 business days, and your finished poster is shipped rolled for safe delivery.
The Difference is in the Print
Of course, choosing the right size is only part of the equation. Every uncapd poster is also printed on gallery-grade canvas using fade-resistant, eco-friendly inks. So whichever format you choose, your artwork looks crisp, vibrant, and built to last. Here's a look at what our community has created so far.
TL;DR
- Six sizes available, from A4 (21 × 30 cm) to Huge (70 × 100 cm)
- Large A2 (42 × 59 cm) is the most popular choice. It's versatile enough for almost any room
- Measure your wall space first to avoid guessing
- All our prints are done on gallery-grade canvas with fade-resistant inks
- Free design previews and complimentary editing are included with every order
- No minimum order, buy one poster or several
- Production takes 1-3 days, with free shipping on orders over £30 (or local equivalent)
The right size makes all the difference. Whether you're after something subtle or a full-on visual statement, uncapd has the dimensions to match your vision.