When it comes to making a bold impression, nothing beats a well-designed poster. Whether you’re promoting an event, showcasing your business, or decorating a space, choosing the right poster paper size and style can make all the difference. In this guide, we’ll walk you through everything you need to know about poster printing, from A4 and A3 sizes to finishes and custom options, so your message stands out loud and clear.
Why Poster Printing Matters
Posters aren’t just about putting ink on paper, they’re about grabbing attention, communicating quickly, and leaving a lasting impression. At CADFlow, we specialise in high-quality poster printing that is sharp, vivid, and built to last.
Whether you’re printing a single A4 flyer or a series of A3 display posters, understanding your options helps you get the best results.
A4 Poster Printing: Small But Mighty
A4 poster printing is perfect for small-scale promotions, indoor noticeboards, or handouts. Measuring 210 × 297mm, it’s the same size as standard office paper, making it an affordable and convenient option for short-run prints.
A4 is ideal for:
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Community bulletins
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Shop window ads
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Event reminders
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Handbills or mailers
Don't underestimate its impact—especially when combined with sharp colour printing on a quality finish.
A3 Poster Printing: The Versatile Favourite
Double the size of A4, A3 poster printing (297 × 420mm) offers more room to play with layouts, imagery, and design. It’s a popular choice for retail promotions, educational posters, and indoor signage where you need to grab attention from a few steps away.
With our professional colour printing process, your A3 posters will look clean, vibrant, and ready to turn heads—whether they’re pinned to a wall or displayed in a frame.
Going Bigger? Just Ask.
While A4 and A3 are great standard sizes, many of our customers come to CADFlow looking for something a little more bespoke. That’s where our custom poster printing service comes in. Whether you need a unique size, specific paper weight, or a particular finish—gloss, satin, or matte—we can tailor your posters exactly to your needs.
Great for:
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Exhibition graphics
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Office or studio décor
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Branded artwork
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Limited-edition print runs
Paper Style: Matte vs Gloss vs Satin
Choosing the right poster paper style is just as important as the size. Here's a quick guide to help:
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Matte – Low sheen, easy to read, and professional. Best for text-heavy designs and indoor use.
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Gloss – High-shine and eye-catching, perfect for photo-rich designs or vibrant advertising.
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Satin – A balanced finish that reduces glare while still giving colours a rich, smooth appearance.
All our posters benefit from high-quality colour printing, ensuring your designs look as good on paper as they do on screen.
Final Thoughts
From A4 flyers to A3 window displays - and every custom size in between -CADFlow’s poster printing service makes it easy to turn your ideas into professional, attention-grabbing prints. With a range of paper styles and finishes, we’ll help you choose the right look and feel for your message.
Whether it’s A4 poster printing, A3 poster printing, or full-blown custom poster printing, we’ve got the tools, the team, and the technology to bring your designs to life in vivid colour.
Need posters printed fast?
Get in touch with CADFlow today for expert advice, sharp colour prints, and a truly tailored poster printing experience.