Poster Printing Sizes Explained for South African Businesses
What are standard poster sizes?
Standard poster sizes in South Africa follow the ISO A-series, running from A4 at 210 by 297mm up to A0 at 841 by 1189mm. Those five sizes cover almost every commercial poster printed in the country, from a notice board flyer to a shopping centre display.
Choosing between them is where businesses lose money. A poster that is too small disappears on a busy wall. One that is too large eats budget it never earns back. The size you need depends on how far away people stand, not on how important the message feels.
This guide gives you every dimension in millimetres, inches and pixels, then explains which size actually suits which job.
Poster sizes in millimetres, inches and pixels
Every A-series poster size has a fixed dimension defined by ISO 216, so an A2 poster is the same size at any printer in South Africa or anywhere else. The pixel column below is the artwork size you need at 300 DPI, which is the resolution commercial printing requires.
| Size | Millimetres | Inches | Pixels at 300 DPI | Typical use |
|---|---|---|---|---|
| A0 | 841 x 1189 | 33.1 x 46.8 | 9933 x 14043 | Exhibitions, outdoor boards |
| A1 | 594 x 841 | 23.4 x 33.1 | 7016 x 9933 | Window displays, event notices |
| A2 | 420 x 594 | 16.5 x 23.4 | 4961 x 7016 | Shop windows, point of sale |
| A3 | 297 x 420 | 11.7 x 16.5 | 3508 x 4961 | Indoor menus, counter signs |
| A4 | 210 x 297 | 8.3 x 11.7 | 2480 x 3508 | Notices, handouts, desk displays |
| A5 | 148 x 210 | 5.8 x 8.3 | 1748 x 2480 | Handbills, table cards |
The system has a neat logic to it. Each size is exactly half the area of the one above it, so two A3 sheets side by side make an A2. Fold an A1 in half and you get A2. That is why a layout scales cleanly between sizes without redesigning it.
What poster printing sizes mean
Poster printing sizes refer to the physical dimensions of the printed poster. In South Africa, most posters follow the ISO A-series paper standard, which is used internationally. Each size increases proportionally, meaning layouts can be scaled consistently across formats.
The most common poster sizes used in business marketing are A4, A3, A2, A1, and A0. Each size serves a different purpose depending on viewing distance, available space, and message complexity.
Understanding how these sizes function in real environments is more important than simply choosing the largest option.
Is poster size A1 or A2?
Both A1 and A2 are standard poster sizes, and the right one depends on viewing distance. A2 at 420 by 594mm suits readers standing within about two metres, which covers shop windows and reception areas. A1 at 594 by 841mm is double the area and holds attention from five metres or more.
A2 is the more common commercial choice in South Africa. It is large enough to carry a headline, supporting text and a strong image without looking cluttered, and small enough to print and mount without specialist handling.
Pick A1 when the poster competes for attention in an open space. Pick A2 when the reader is already close.
What size is an A0 poster?
An A0 poster is 841 by 1189mm, or 33.1 by 46.8 inches, making it the largest standard size in the A-series. Its area is almost exactly one square metre, which is the design principle the whole system is built on.
A0 is built for distance. Exhibition stands, outdoor notice areas and large retail displays are where it earns its cost. At this size the message needs to be short and the contrast strong, because nobody stands still to read an A0 poster.
Printing at A0 usually means large format equipment rather than a standard office press. If you are working at this scale, our large format printing in Johannesburg covers the equipment and stocks that handle it.
Is 24×36 a poster size?
Yes, 24 by 36 inches is a standard poster size, but it is an American one rather than a South African one. It measures roughly 610 by 914mm, which sits between A1 and A0 without matching either.
You will see 24×36 quoted constantly online because most poster guides are written for the United States market. If you design to it and print in South Africa, expect either a custom cut or white margins where the artwork does not fill an A-series sheet.
Design to A1 or A0 instead. Local stock, local equipment, no trimming surprises.
Small poster sizes: A4 and A3
A4 and A3 posters are considered small-format posters. They are designed for close-range viewing and work best indoors where people can stand directly in front of them.
Common uses include:
- Notice boards in offices or schools
- In-store informational posters
- Price lists or internal announcements
Because of their size, these posters should contain limited text and clear headings. Overloading small posters with information reduces readability.
Small posters are often printed alongside other supporting materials such as flyers. Businesses frequently align these formats visually when producing Flyers, Leaflets & Posters as part of a coordinated campaign.
Medium poster sizes: A2
A2 posters are one of the most commonly used poster sizes for business promotion. They strike a balance between visibility and practicality and are suitable for both indoor and sheltered outdoor use.
A2 posters are ideal for:
- Shop windows
- Reception areas
- Event notices
- Point-of-sale displays
At this size, posters can include a headline, supporting text, and a strong visual without feeling cluttered. A2 posters are large enough to attract attention from a short distance but still easy to handle and display.
Many South African retailers and service businesses choose A2 as a default size because it offers good impact without significantly increasing printing or mounting costs. If you are weighing up a run and want the numbers before you commit, you can ask us for a quote and we come back within 24 hours.
Large poster sizes: A1 and A0
A1 and A0 posters fall into the large format category. These sizes are designed for long-distance visibility and are typically used in high-traffic or open spaces.
Common applications include:
- Shopping centre promotions
- Event signage
- Outdoor notice areas
- Large retail displays
Large posters must be designed differently from smaller formats. Text should be minimal and bold, with strong contrast and simple messaging. Viewers are unlikely to stand close or read detailed information.
Large posters are often produced as part of broader campaigns that include banners, signage, and other visual elements. In those cases, poster production is often coordinated with Event Branding to ensure consistency across all display materials.
Matching poster size to viewing distance
Viewing distance is the single most useful test for choosing a poster size. Work out how far away the reader will stand, then size up from there.
- Close viewing requires smaller posters with readable body text
- Medium viewing suits A2 posters with structured layouts
- Long-distance viewing requires large posters with short messages
If a poster is intended to be read while people are moving, such as in corridors or shopping centres, simplicity is essential. If it is intended for stationary viewing, such as waiting areas, more detail can be included.
Ignoring viewing distance is one of the most common reasons posters fail to perform as expected.
Setting up artwork and bleed for each size
Poster artwork needs bleed, which is extra image area extending past the trim line so no white edge appears when the sheet is cut. Commercial printing in South Africa generally works to 3mm of bleed on each edge, so an A2 poster is supplied as a 426 by 600mm document rather than 420 by 594mm.
Keep important content away from the edges too. A safe margin of 5mm inside the trim line stops headlines and logos being clipped when the guillotine varies slightly.
Resolution matters more as size increases. Supply artwork at 300 DPI wherever possible, and for A1 and A0 work from vector files or high-resolution originals, because an image that looks sharp at A3 will show its pixels at A0. Our guide to bleed and print-ready artwork covers the file setup in detail.
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Cost and material considerations
Poster size directly affects printing cost. Larger posters use more paper and ink and may require heavier stocks or lamination for durability. Mounting and display methods also become more expensive as size increases.
Businesses should consider how long the poster will be used. Short-term promotions may not justify premium materials, while long-term displays often benefit from stronger paper or protective finishes.
Balancing size, material, and lifespan helps control costs without compromising effectiveness.
Indoor vs outdoor poster use
Indoor posters are protected from weather and handling, allowing for lighter materials and finer detail. Outdoor posters require more durable stocks and simplified designs to remain legible under varying light conditions.
For outdoor or semi-outdoor use, larger sizes often perform better because they remain visible even when conditions are not ideal.
Choosing size without considering the environment can lead to posters that deteriorate quickly or fail to attract attention.
Designing effectively for each size
Effective poster design changes with size. A design that works at A4 may not work at A1 without adjustment.
Larger posters require:
- Fewer words
- Larger fonts
- Strong visual hierarchy
Smaller posters can support more detailed information, but still need a clear structure.
Designing with the final size in mind ensures the poster remains readable and visually balanced once printed.
Why South Africa uses the A-series
South Africa adopted the format as a national standard in 1966, nine years before it became the international standard in 1975. That is why every printer, copy shop and office supplier in the country works to the same sheet sizes, and why artwork prepared here fits equipment anywhere else that uses the system.
The standard itself is built on a single rule. Every sheet has the same width-to-height ratio of one to the square root of two, which is what allows a size to be halved or doubled without changing the proportions of the design.
For a general explanation of the standard, see ISO 216.
How to choose the right poster size
Start with viewing distance, then check the space, then set the budget. That order matters. Most poster mistakes come from picking a size that suited the budget and hoping it would carry far enough.
For close indoor reading, A4 and A3 do the job. For shop windows and point of sale, A2 is the workhorse. For open spaces where the poster has to compete, go A1 or A0 and cut the word count hard.
Get the size right and a poster keeps working for months. Get it wrong and it is invisible from the moment it goes up.
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