Posters · Glossary

A0 size in pixels at 72, 150 and 300 DPI

A0 is 841 by 1189 millimetres, so its pixel size depends on the resolution: 2384 by 3370 pixels at 72 DPI, 4967 by 7022 at 150 DPI and 9933 by 14043 at 300 DPI. For a poster read from a metre or more, 100 to 150 DPI is usually enough, which keeps files far smaller.

Pixels have no physical size until a resolution is chosen, so A0 in pixels is a table, not a single number. The useful question is which row of that table a poster actually needs, and the answer is almost never the biggest one.

Nuwan Madhusanka · Co-founder

4 min read · Published 21 October 2026

A0 in pixels at common resolutions
Resolution	Portrait pixels	Megapixels	Uncompressed RGB size	Typical use
72 DPI	2384 x 3370	8.0 MP	about 24 MB	screen preview only
100 DPI	3311 x 4681	15.5 MP	about 46 MB	poster read from 1 to 2 m
150 DPI	4967 x 7022	34.9 MP	about 105 MB	poster with small chart labels
200 DPI	6622 x 9362	62.0 MP	about 186 MB	photographic poster seen close
300 DPI	9933 x 14043	139.5 MP	about 418 MB	rarely needed at A0
Landscape	swap width and height
Physical size	841 x 1189 mm, 33.11 x 46.81 in, ratio 1 : 1.414

Why there is no single A0 pixel size

ISO 216 defines A0 in millimetres, 841 by 1189, one square metre of paper. A pixel count only appears when that area is divided by a dot density. Multiply the size in inches by the DPI and the pixels follow: 33.11 inches times 150 gives 4967 pixels across. The same file can be printed at A0 at different densities, so a 3311 by 4681 pixel image is an A0 at 100 DPI, an A1 at about 141 DPI and an A2 at 200 DPI. That is why print shops ask for the size and the resolution together.

How much resolution an A0 poster needs

The right density depends on how close people stand. A conference poster is read from about one to two metres, where the eye cannot separate dots finer than about 100 per inch, so 100 to 150 DPI looks sharp. A photographic print hung in a gallery, where people step close, benefits from 200 DPI or more. At 300 DPI an A0 file holds about 140 million pixels; uncompressed in RGB that is around 418 megabytes, which slows design tools, blows past email limits and adds nothing visible from a step back.

Vector content does not need pixels at all

Text, lines and charts exported from a design or charting tool as vectors print at the full resolution of the printer whatever the document's pixel size. Only photographs and other bitmap images need enough pixels. A practical rule is to make sure each photo is at least 150 DPI at the size it will appear on the board; a photo filling a quarter of an A0 width, about 21 centimetres, needs roughly 1240 pixels across. Screenshots of charts are the usual weak spot, since they are often captured at screen resolution and print soft.

Common mistakes

The first is setting up a 9933 by 14043 pixel canvas because 300 DPI sounds right, and then fighting a slow, unstable file for days. The second is the opposite: a 72 DPI canvas of 2384 by 3370 pixels, which is enough for a preview but prints soft text at A0. The third is pasting low resolution logos or chart screenshots onto an otherwise sharp poster. The fourth is a landscape and portrait mix up, swapping width and height when the board needs the other orientation.

A0 pixels in the poster tab

The poster tab in the flyer editor makes A0 portrait and A0 landscape boards. The working canvas is 1656 by 2340 pixels, about 50 DPI at A0, so the design stays responsive in the browser. Exports are captured at twice the canvas, 3312 by 4680 pixels, which is A0 at 100 DPI, the density that suits a poster read from a metre or more. Exports are RGB PDF, PNG or JPG with no bleed or crop marks, and there are 40 poster templates, 20 per orientation. The blank PNG linked above is 9933 by 14043 pixels, A0 at 300 DPI, for anyone who needs that density in another tool.

Questions people ask

Is 100 DPI enough for an A0 poster?

For a poster viewed from one metre or more, usually yes. Text and charts look clean at that distance, and photos only look soft if someone inspects them closely. Many people use 150 DPI as a safety margin for small chart labels and reference text, which A0 posters tend to carry.

What is A0 landscape in pixels?

The same numbers with width and height swapped: 3370 by 2384 at 72 DPI, 7022 by 4967 at 150 DPI and 14043 by 9933 at 300 DPI. The physical size is 1189 by 841 millimetres, and the proportion is still 1 to 1.414, so the same content can be rearranged between the two orientations.

How big is an A0 PDF file?

It depends on what is inside. A PDF of vector text and charts can be only a few megabytes, because it stores shapes rather than pixels. A PDF built from one large flattened image is much bigger, often tens of megabytes even after compression. Print shops usually take files that size through an upload link rather than email.

Can I print an A0 poster from a phone photo?

A 12 megapixel phone photo, about 4000 by 3000 pixels, covers an A0 width at around 120 DPI, which looks acceptable from a step back. For a full bleed photographic A0 that people will inspect closely, a higher resolution camera or an upscaled image gives a cleaner result.

What DPI does a print shop want for A0?

Ask the shop, because large format printers vary. Many accept 150 DPI at final size and some ask for 300 DPI on all jobs by default, mainly for consistency with small prints. If a file is 150 DPI and the content is vector text and charts, explain that, and most will accept it.

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Sources

Written and checked by the OneCraft team. Last checked 21 October 2026.