A poster works from across the room or it does not work at all.
That is the whole test. Someone walks past, ten or fifteen feet away, and your poster has a second or two to stop them. If the headline is too small, the colours too flat, or the message buried, they keep walking and never know what they missed.
Posters are still one of the most effective ways to fill a physical space with your message. Shop windows, event venues, college noticeboards, exhibition halls, building hoardings. But the rules are different from a flyer or a brochure, because a poster is read at a distance, not in the hand.
This guide covers the sizes, papers, and materials you can choose from, the design rules that make a poster readable from across a room, and how to order one that holds up where you hang it.
What Is a Poster?
A poster is a large-format printed sheet designed to be displayed on a wall, window, or board and read from a distance. It uses a bold headline, a strong image, and minimal text to deliver a message quickly to people passing by. Posters range from A3 for small notices up to A0 and beyond for large displays, and they print on paper for indoor use or synthetic materials like vinyl for outdoor use.
The defining feature is scale.
A poster is not something you hand over. It hangs in a fixed spot and does its work on everyone who walks past. That changes everything about how it should be designed: bigger type, simpler layout, higher contrast, and one message that reads in a glance from across the room.
Standard Poster Sizes
Posters follow the A-series sizing system, where each size is double the one below it. A3 (11.7 x 16.5 inches) suits small notices and indoor displays. A2 (16.5 x 23.4 inches) and A1 (23.4 x 33.1 inches) are the most common wall poster sizes. A0 (33.1 x 46.8 inches) is for large, high-impact displays. The right size depends on your viewing distance and the space you are filling.
A3 (11.7 x 16.5 inches). The smallest common poster. Good for shop counters, noticeboards, lift lobbies, and indoor notices read from a few feet away.
A2 (16.5 x 23.4 inches). A step up to a proper wall poster. Works for shop windows, event promotion, and college or office displays. Readable from across a room.
A1 (23.4 x 33.1 inches). A large, attention-grabbing size. Common for film-style posters, exhibition displays, and anywhere you want real presence on a wall.
A0 (33.1 x 46.8 inches). The largest standard size, nearly one square metre. For maximum impact: hoardings, large event backdrops, and displays meant to be seen from far away.
Custom sizes. For hoardings, standees, and displays with specific dimensions, custom large-format printing covers anything the standard sizes do not.
If you are unsure, A2 is a safe, versatile choice for most wall displays. Go larger for distance and impact.
Paper and Material Options
Poster material depends on where it will hang. Indoor posters print on paper: 130 to 170 GSM for short-term displays, 200 to 300 GSM for a sturdier, premium feel that resists curling. Outdoor posters need synthetic materials like vinyl or flex, which are waterproof and tear-resistant, usually with a UV coating to stop colours fading in sunlight. Choosing the wrong material is the fastest way to ruin a poster.
Indoor Paper
130 to 170 GSM art paper. The standard for short-term indoor posters: events, promotions, notices. Affordable and perfectly good for displays that come down after a few weeks.
200 to 300 GSM art paper or card. Heavier, sturdier, and more premium. Resists curling, survives handling and transport, and feels substantial. Worth it for posters you want to last or that represent a brand.
Outdoor Materials
Vinyl and flex. Synthetic, waterproof, and tear-resistant. The standard for any poster exposed to weather: hoardings, outdoor event boards, building displays. Regular paper simply cannot survive outside.
UV coating. A protective layer that slows fading from sunlight. Essential for outdoor posters that need to stay vivid for more than a few days.
Finishes
Gloss. A shiny, reflective surface that makes colours and photos pop. Eye-catching, but can produce glare under bright or direct light.
Matte. A flat, non-reflective finish. Easier to read, no glare, and understated. Good for text-heavy and informational posters.
Satin (semi-gloss). The middle ground. Rich colour with less glare than gloss. A good default if you can't decide between the two.
How to Design a Poster That Works From a Distance
A poster is read from across a room, so design for distance, not for the hand. Use a clear hierarchy: one large headline, one strong image, and short supporting text. As a rule, allow about one inch of letter height for every ten feet of viewing distance. Keep high contrast between text and background, leave roughly 30 percent of the design as white space, and put the key message where the eye lands first.
The rules that matter:
Build a clear hierarchy. The eye should land on the headline first, the image second, the details last. Size and contrast control that order. If everything is the same size, nothing stands out.
Size text for the viewing distance. A headline read from ten feet needs to be large, roughly 72 points or more. Subheadings around 24 to 36 points, body text 12 to 18. If people squint, the poster has failed.
Use high contrast. Dark text on a light background, or light text on a dark one. Low-contrast colour combinations that look fine on screen disappear at poster distance.
Leave white space. Aim for around 30 percent empty space. A crammed poster reads as noise from across a room. Space is what makes the key message stand out.
Lead with one image. A single strong image carries a poster further than several small ones. It anchors the design and pulls the eye from a distance.
Keep the message short. A poster is not a document. A headline, a few supporting lines, and a clear next step or detail. Anything more gets ignored at distance.
Common Poster Mistakes to Avoid
Most poster problems come from designing for the screen instead of the wall. The usual mistakes are low-resolution images that blur when enlarged, text too small to read at a distance, low-contrast colours that vanish across a room, and using paper for an outdoor display that warps the first time it rains. Each one is avoidable with a little planning.
Low-resolution images. An image that looks sharp on screen can blur badly when blown up to poster size. Check resolution at the final print dimensions, not on your monitor.
Text too small. The most common readability failure. Design for the distance the poster will actually be viewed from, and make the headline far bigger than feels necessary on screen.
Low contrast. Subtle, tonal colour palettes that look elegant up close vanish at poster distance. Push the contrast harder than you think you need.
Wrong material for the location. Paper outdoors is a guaranteed failure. It warps, tears, and fades within days. Match the material to where the poster will hang.
RGB colours. Designing in RGB means colours shift when printed in CMYK. Convert before exporting so what you see is close to what prints.
Skipping the proof. On a large poster, a small error becomes a big one. Always review a proof before committing to print.
How to Prepare Poster Files for Printing
Supply a press-ready PDF in CMYK colour mode at the correct resolution for the size: 300 DPI for posters viewed up close, 150 DPI for large posters viewed from a distance, both measured at the final print size. Add 3 mm bleed on all edges and keep important text well inside the trim. Use vector graphics for logos and text where possible, since vectors stay sharp at any size while raster images do not.
Your checklist:
File format. Press-ready PDF. Vector formats (AI, EPS) are ideal for posters because they scale without losing sharpness.
Colour mode. CMYK, not RGB. Convert before exporting so your colours do not shift on paper.
Resolution. 300 DPI at final size for close viewing, 150 DPI for distance viewing. Always check at the printed dimensions, not on screen.
Bleed. 3 mm past the trim on all sides. Keep text and logos well inside the trim line.
Scale. Design at the final size, or at a clean fraction of it (for example, half size at double the DPI). Avoid scaling up a small file, which softens everything.
For runs and method, large poster batches and the digital-versus-offset trade-off work the same as other print jobs, which we cover in the digital printing guide. If your campaign also needs handouts, pair posters with matching flyers.
What to Do Next
If you need posters printed, here is how to get started:
- Decide your size, where the poster will hang (indoor or outdoor), and quantity
- Prepare your design as a press-ready PDF in CMYK at the right resolution for the size (or ask the printer to design it)
- Send your files and specs for a quote
At Paper & Beyond, we print posters in every standard size from A3 to A0 and custom large formats, on indoor paper or weatherproof outdoor material, with matte, gloss, or satin finishes. Runs from small batches to bulk campaigns, delivered across India. We handle design too if you need it.
Send us your files or tell us what you need. We will get back to you within 24 hours.
Frequently Asked Questions about Poster Printing
What are the standard poster sizes?
The common sizes follow the A-series: A3 (11.7 x 16.5 inches), A2 (16.5 x 23.4 inches), A1 (23.4 x 33.1 inches), and A0 (33.1 x 46.8 inches). Each is double the one below it. A3 suits small notices, A2 and A1 are the workhorse wall sizes, and A0 is for large displays.
What paper is best for posters?
For indoor posters, 130 to 170 GSM for short-term displays, 200 to 300 GSM for a sturdier premium feel. For outdoor, use vinyl or flex that is waterproof and tear-resistant. The right choice depends on where the poster hangs and for how long.
What is the difference between matte and gloss posters?
Gloss is shiny and makes colours pop but can glare under bright light. Matte is flat and non-reflective, easier to read, and understated. Satin sits in between, with rich colour and less glare than gloss.
What resolution do I need for a poster?
For close viewing, 300 DPI at final print size. For large posters viewed from a distance, 150 DPI is usually enough. Always check the DPI at the actual printed size, not on screen.
Can posters be printed for outdoor use?
Yes. Outdoor posters use vinyl or flex that withstands rain, sun, and handling, usually with a UV coating to stop fading. Regular paper posters are indoor only.
How do I design a poster to be read from a distance?
Use a clear hierarchy: a large headline (about one inch of letter height per ten feet of viewing distance), a strong image, and short text. Keep high contrast, leave around 30 percent white space, and lead with the key message.