A3 Poster Printing

Description

Affordable A3 Poster Printing – Small Format, Big Results

Get your message across in a compact but powerful format with our A3 poster printing service.

Whether you’re promoting an event, sharing internal info, or creating retail signage, A3 is a popular and practical size for posters throughout the UK.

Printed on high-quality paper with lamination and waterproof options available, our A3 posters are perfect for indoor and outdoor use — all printed and dispatched right here in the UK.

A3 Poster Printing Size Guide

A3 is exactly twice the size of A4 and works perfectly for posters that need to be informative, eye-catching, and easy to handle.

• Size: 297 mm × 420 mm
• Orientation: Portrait or Landscape
• Resolution: 300 dpi recommended
• Bleed: Add 3 mm on all sides (final artwork size: 303 mm × 426 mm)

Compact enough for noticeboards, windows, and handouts, but large enough to stand out clearly.

This size is especially popular for smaller spaces, indoor advertising, and promotions.

Paper Types & Finishes for A3 Posters

We offer flexible paper choices to suit any A3 poster project — from glossy point-of-sale visuals to durable outdoor signage.

Indoor Use:

Classic Demimatt – A smooth satin paper ideal for sharp, vibrant prints

Extraprint – Brilliant white, uncoated paper offering excellent contrast and a premium matte feel

Outdoor Use:

Magistra Deluxe Blueback – A waterproof, anti-show-through stock perfect for pasting or weather-exposed use

Available Paper Weights:

• 100gsm – Light and economical
• 130gsm / 170gsm – Standard for business and promotional use
• 250gsm / 300gsm – Sturdy, premium options for maximum impact

Lamination Choices:

• Gloss Lamination – Enhances colours with a shiny finish
• Matt Lamination – Reduces glare and adds a sophisticated texture

Tip: For small posters used outdoors (like A-boards or shopfronts), we recommend Blueback waterproof paper with a matt lamination for maximum readability and durability.

Why Choose Our A3 Poster Printing?

• Multiple stock weights: 100–300gsm
• Waterproof Blueback paper for outdoor use
• Professional lamination options
• Portrait or landscape orientation
• Free file check before printing
• Printed in the UK with tracked delivery

Whether you need one or one hundred, our A3 posters combine quality, flexibility, and fast turnaround.

Preparing Your A3 Artwork

To get the best print results, follow these artwork guidelines:

• Design size: 297 mm × 420 mm
• Add 3 mm bleed on each edge (final size: 303 mm × 426 mm
• Resolution: 300 dpi
• Colour Mode: CMYK
• File types accepted: PDF, JPEG, TIFF

We offer free pre-print file checks, so you don’t have to worry about setup issues.

Fast UK Delivery

All A3 posters are printed in the UK and shipped quickly with your choice of:

• Standard turnaround: 2–3 working days
• Express service: Same-day dispatch (on request)
• Delivery: Tracked courier or Royal Mail services

Not sure about what is A2 Poster Size?

An A3 poster has the following dimensions:

• Millimeters (mm): 297 × 420 mm
• Centimeters (cm):7 × 42.0 cm
• Inches:7 × 16.5 inches

A3 is exactly half the size of A2 – when you fold an A2 sheet in half along its longer side, you get A3. It maintains the same √2:1 aspect ratio as all other A-series sizes. We also sell A1, A2, A3 and A4 posters make sure to check them out here.

FAQs

Can A3 posters be laminated?

Yes! Choose gloss for rich color or matt for a refined, glare-free finish.

Are A3 posters suitable for outdoor use?

Absolutely. Select our Magistra Deluxe Blueback waterproof stock for outdoor durability.

What paper weight should I choose?

Use 130–170gsm for standard prints or upgrade to 250–300gsm for a sturdier, more premium feel.

Do you offer free artwork checks?

Yes, every file is checked before printing to ensure quality and print readiness.