A3 Poster Printing: Small Enough for Anywhere, Big Enough to Be Seen

A3 posters, photo prints and art prints (297 × 420 mm), printed sharp and bright in our own High Wycombe factory. One poster or five hundred, with a free artwork check, a proof to approve and an honest ready-by date before you order.

A3 is the poster size that goes where others can't. It fits on a counter, in a menu case, on a crowded notice board, beside a till or in a standard frame on your wall. It's twice the size of A4, so it stands out from flyers and paper notices, but it never takes over the room.

And if your office printer stops at A4, you're not alone. Send us your file and we'll print it properly: full colour, crisp edges and the right paper for the job.

Tell us what you need and when. We'll check your artwork for free, flag anything that needs fixing and send a proof. Nothing is printed until you say yes.

  • Free artwork check on every order, including whether your file is sharp enough for A3
  • Proof to approve before anything prints
  • Honest timings, with urgent printing on selected products. See our urgent signs
  • Made in our own High Wycombe factory, collected or delivered.

A3 at a Glance

Every A3 measurement in one handy card.

A3

Millimetres

297 × 420 mm

Centimetres

29.7 × 42 cm

Inches

11.7 × 16.5 in

Area

about an eighth of a square metre (0.125 m²)

Diagonal

about 514 mm (20.3 in)

Portrait

297 mm wide × 420 mm tall

Landscape

420 mm wide × 297 mm tall

A4 sheets in an A3

2, side by side

Half the size of

A2 (420 × 594 mm)

Standard

ISO 216, the same shape as every A size

Pixels you need for a sharp A3:

Quality

Pixels (portrait)

When to use it

150 dpi

1,754 × 2,480

Posters read from a metre or more

300 dpi

3,508 × 4,961

Photo prints, art prints and anything viewed up close

Because people read A3 up close, aim for 300 dpi on photos. Text and logos in a PDF stay sharp at any size.

How Big Is A3, Really?

  • Two A4 sheets placed side by side make one A3.

  • An open magazine: most UK magazines opened flat are close to A3.

  • A tabloid newspaper page is almost exactly the same size.

  • On a counter, an A3 poster in a stand sits right at eye level for someone waiting to pay.

  • On a wall, it's the classic framed-print size for hallways, offices and cafes.

A3, A2 or A4? Pick in 30 Seconds

Size

Dimensions (mm)

Choose it when…

Read from

A2

420 × 594

You need to be seen across a corridor or room

2 to 4 m

A3

297 × 420

People will be close: counters, menu cases, notice boards, frames

1 to 2 m

A4

210 × 297

Leaflet-style notices, handouts and tiny spaces

under 1 m

Need something bigger? See A1 poster printing , or browse every size in our poster printing range.

Quick rule: at A3, a headline about 20 mm tall reads well from 2 metres. If people need to read it from further away, go up a size.

Where A3 Posters Work Best

  • A3 is the close-up size. It works best where people stop, queue or stand still:

  • Counters and tills: offers, loyalty schemes and "ask us about…" posters right where people pay.

  • Menu cases and pub boards: A3 menus, specials and event listings, readable at arm's length.

  • Notice boards: big enough to stand out from the A4 notices around it, small enough to leave room for everyone else.

  • Shop windows at eye level: a row of A3 posters can show several offers at once. For permanent glass branding, see our window graphics.

  • Washrooms, lifts and staff rooms: policies, hygiene notices and campaigns. Choose PVC or laminated so they wipe clean.

  • Frames on the wall: A3 is the most popular framed-print size for homes, offices, cafes and salons.

  • Mass campaigns: elections, events, charities and franchises, where you need hundreds of identical posters.

Choose Your A3 Poster

A3 Paper Posters

Bright, crisp and great value, especially in bulk. Standard A3 poster prints for shops, events, schools and offices, in matt, silk or gloss.

A3 Photo Prints

Turn your best shots into wall-worthy prints. A3 photo printing gives family photos, holiday shots, product images and portraits real presence, with rich colour and fine detail. Send the original file from your camera or phone, and we'll check it before printing.

A3 Art Prints and Wall Art

Gallery-quality A3 art prints for artists, illustrators and makers. Ideal for selling at fairs and online, decorating a cafe or salon, or framing for the office wall.

A3 PVC and Laminated Posters

For anywhere hands, water or weather can reach. A3 PVC posters are waterproof and tear-resistant, and laminated paper posters wipe clean. They're perfect for kitchens, washrooms, gyms, menu cases and outdoor notice boards.

A3 Boards and Signs

A rigid A3 that stands, hangs or fixes to a fence. Print your A3 on Foamex for indoor signs, or choose A3 Correx signs for weatherproof site and event signs. For desk and exhibition displays, see our custom display boards.

A3 Document and Plan Printing

When your printer can't do A3. Colour or black-and-white A3 documents, plans, charts, reports and presentation boards.

Your Printer Stops at A4? Here's the Easy Way to Print in A3

Most home and office printers only take A4 paper. You can stretch your design across two A4 sheets and tape them together, but the join always shows. Or you can let us print it properly:

  • Save your file as a PDF. In Word, PowerPoint or Canva, choose A3 as the page size first, then export or "Save as PDF".

  • Not sure it's set to A3? Send it anyway. A4 designs scale up perfectly to A3, because every A size has the same shape.

  • Upload it or WhatsApp it to us. We'll check it for free and send a proof.

  • Collect it or have it delivered, printed in full colour on proper poster paper.

No need to buy an A3 printer for a few posters. We'll print one or one thousand.

Will My File Look Sharp at A3?

  1. A4 designs scale up perfectly. An A4 PDF becomes an A3 with no cropping or stretching. Text and logos stay sharp.

  2. Phone photos are usually great at A3. A 12-megapixel phone photo (about 4,000 × 3,000 pixels) prints at around 250 dpi on A3, which is crisp even up close.

  3. Avoid screenshots and images sent over WhatsApp or social media. They lose detail. Send the original file instead.

  4. Add 3 mm bleed if your colour runs to the edge, and keep text 5 to 10 mm inside the trim.

  5. Frame it? Frames hide a few millimetres around the edge, so keep important details away from the border.

  6. Proofread the boring bits. Dates, times, prices and phone numbers cause the most reprints.

Our free artwork check covers all of this and tells you exactly what to fix.

A3 Design Tips That Make People Stop and Read

  • One big idea. An A3 poster has about three seconds to win attention. Lead with your offer, event or message, not your logo.

  • Headline at least 20 mm tall, so it reads from a couple of metres away.

  • Break up the text. Use three or four short lines, not a paragraph.

  • Use a strong image. One great photo beats a collage of small ones.

  • Add a clear next step: a QR code, website, date or "ask at the counter". Test the QR code before printing.

  • Printing a set? Keep the same layout and change one line per poster, such as the date, venue or product, so they look like a family.

No designer? Send your words, logo and photos and we'll lay it out for you.

What Does A3 Poster Printing Cost?

A3 is one of the most affordable poster sizes, and it gets cheaper per poster the more you order. Your price depends on:

  • Quantity: this makes the biggest difference. Ten posters cost far less each than one, and hundreds less again.

  • Paper or finish: standard poster paper is the cheapest, while photo papers, PVC and lamination cost a little more.

  • Single or double-sided: double-sided is useful for window posters read from both sides.

  • Speed: standard turnaround is the best value, and urgent slots are available on selected products.

Send us your quantity and we'll give you a clear A3 price with no obligation.

Need it fast? Tell us your deadline and we'll say honestly whether we can make it.

How It Works: From File to A3 in Four Steps

  1. Tell us what you need. Posters, photo prints or art prints, the paper or finish, how many and the date you need them.

  2. Send your file. PDF is best, and we also accept AI, EPS, JPG and PNG. No file yet? Send your words and images and we'll help.

  3. Approve your proof. We check it for free, tell you straight away if anything needs fixing, and send a proof. Nothing prints until you say yes.

  4. We print, trim and pack. Printed in our High Wycombe factory, then collected or delivered flat and protected.

Start Your A3 Order

Who Orders A3 Posters and Prints From Us

  • Cafes, pubs and restaurants: menus, specials, events and quiz nights.

  • Shops and salons: offers, price lists and counter posters.

  • Schools and nurseries: notice boards, classroom displays and parents' evening posters. See our school signs for permanent signage.

  • Offices and clinics: policies, health and safety notices and staff campaigns.

  • Charities, churches and community groups: fundraisers, appeals and event posters in bulk.

  • Event organisers and venues: gig posters, programmes and sponsor boards.

  • Photographers and artists: A3 photo prints, art prints and prints for sale.

  • Estate agents: property posters for windows and boards.

Need Anything to Go With Your A3 Posters?

How ordering works

  1. 1

    Choose your options

    Size, material, finish and how many. Not sure? Ask us and we'll help you choose.

  2. 2

    Send your artwork

    PDF is best; we also take AI, EPS, JPG and PNG. No artwork yet? Tell us what you need.

  3. 3

    Approve your proof

    We check every file and send you a proof. Nothing is printed until you approve it.

  4. 4

    We make it

    We print and finish it, and let you know as soon as it's ready.

Ready to Print Your A3 Posters?

Tell us what you're printing, how many and when you need them. We'll come back with a clear price and an honest ready-by time.

Get a free quote

Or call us on +443330541033

Why People Choose Urgent Sign for A3 Printing

Honest timings, always.

The ready-by date we give you is the real one. If we can't make your date, we'll say so before you order.

A free artwork check that catches the costly stuff.

We check spelling, bleed, fonts and image quality, and tell you whether your photo is sharp enough for A3 before anything prints.

Made in our own factory.

Your A3 posters are printed and trimmed in High Wycombe. No middlemen, and no guessing where your order is.

You talk to the people printing your posters.

Call, WhatsApp or email and you reach the factory floor. No call centres, no ticket numbers.

Everything for your display under one roof.

Posters, banners, boards and signs all come from one team, so your colours match everywhere.

Family-run since 2013.

We've helped shops, schools, charities and local businesses get seen for more than a decade. Find out more about us.

Ready to Print Your A2 Posters?

Tell us the material, the quantity and the date you need them. We'll come back with a clear price and an honest ready-by time.

A3 Poster Printing FAQs

Can't see your question? Call the workshop or send us a WhatsApp.

Still have a question? Talk to the people making your sign.
19 questions
What size is an A3 poster?

An A3 poster is 297 × 420 mm, which is 29.7 × 42 cm or 11.7 × 16.5 inches. It's twice the size of A4 and half the size of A2.

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What are A3 measurements in mm?

A3 is 297 mm wide and 420 mm tall in portrait, or 420 mm wide and 297 mm tall in landscape.

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How big is A3 compared with A4?

A3 is exactly twice the size of A4. Put two A4 sheets side by side and you have one A3.

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What's the difference between A3 and A2?

A2 is twice the size of A3, at 420 × 594 mm. Choose A3 for counters, menu cases and frames, and A2 when people need to read it from further away.

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What size frame do I need for an A3 print?

A2 is twice the size of A3, at 420 × 594 mm. Choose A3 for counters, menu cases and frames, and A2 when people need to read it from further away.

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How do I print in A3 if my printer only does A4?

Save your design as a PDF and send it to us. We'll check it for free and print it in full colour at A3. There's no need to buy an A3 printer.

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Can I print an A4 design at A3?

Yes. All A sizes have the same proportions, so an A4 design scales up to A3 with no cropping or stretching.

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What resolution do I need for an A3 print?

For posters, 150 dpi (1,754 × 2,480 pixels) is fine. For photo and art prints viewed up close, aim for 300 dpi (3,508 × 4,961 pixels). Our free artwork check tells you if your file is sharp enough.

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Will my phone photo print well at A3?

Usually, yes. A 12-megapixel phone photo prints at around 250 dpi on A3, which looks crisp. Send the original file, not a screenshot or a social media copy.

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What file format should I send?

PDF is best, with fonts embedded. We also accept AI, EPS, JPG and PNG.

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Do you do A3 photo printing?

Yes. We print A3 photo prints from camera and phone images, with rich colour and fine detail.

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Can you print A3 art prints?

Yes. Send us your artwork and we'll recommend the best paper and finish for it.

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Can A3 posters be waterproof?

Yes. Choose A3 PVC posters or laminated paper posters for windows, washrooms, kitchens and outdoor notice boards.

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Can you print A3 on board?

Yes. We can print A3 on Foamex for indoor signs or Correx for weatherproof outdoor signs.

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How much does A3 poster printing cost?

It depends on quantity, paper and speed. The more you order, the less each poster costs. Send us your quantity for a clear, no-obligation price.

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Can I order just one A3 print?

Yes, we're happy to print a single A3 poster or photo print.

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How quickly can I get A3 posters?

Tell us your deadline and we'll give you an honest ready-by time before you order. Urgent printing is available on selected products

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Can I order A3 prints online?

Yes. Upload your file through our quote form or WhatsApp it to us. We'll reply with a price and a proof.

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Where can I get A3 printing near me?

We print at St George's Works, Coronation Road, High Wycombe, HP12 3GG, open Monday to Saturday, 09:00 to 17:30. You can collect, or we'll deliver across the UK. Questions? Contact the team at Urgent Sign.

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