An A3 poster has approximately twice the area of A4, and A2 has approximately twice the area of A3. Each step is a clear increase on the wall, even though neither edge doubles in length.
| Poster size | Portrait dimensions | Landscape dimensions |
|---|---|---|
| A4 | 21 × 29.7 cm | 29.7 × 21 cm |
| A3 | 29.7 × 42 cm | 42 × 29.7 cm |
| A2 | 42 × 59.4 cm | 59.4 × 42 cm |
The dimensions describe the paper. A frame or mount will make the finished display larger, so measure the complete arrangement if you are filling a particular space.
Start with where the print will go
A4 is worth trying for a smaller wall area or a print viewed at close range. A3 gives the photograph more presence without taking the same space as A2. A2 makes a larger feature, but its suitability depends on both the wall and the image.
Those are starting points rather than room-size rules. Use sheets of paper to mock up the dimensions and view them from where you normally stand or sit. If a frame is already waiting, its required print size should lead the decision.
Check whether your photo fits an A size
A-series paper has a consistent shape, but phone and camera photographs use several different proportions. A 4:3 photo will not fill an A-size sheet exactly without cropping or a border treatment. The preview should make the chosen result clear.
Switching between portrait and landscape reverses the dimensions; it does not make a wide photograph naturally fit a tall sheet. Keep the subject inside the crop and avoid choosing a size solely by its name.
Choose the file before the largest size
Use the best available original. Enlarging makes blur and compression easier to notice, especially when the poster will be examined close up.
The additional illustrations below are imagined examples, not physical print tests. Frames and mounts are shown for styling and are not included with the poster.
Try the size before choosing it on a screen
Cut or join plain paper to the proposed dimensions and place it on the wall temporarily using a suitable non-marking method. View it from your normal seat or standing position. Check nearby furniture and switches, and allow for the actual outside frame dimensions.
A size that looks generous on a desk may feel small across a room. A small print can still be the right choice for a closer, quieter display. Choose for the setting and photograph rather than treating the largest affordable sheet as the automatic winner.
Why an A-size print may crop a camera photograph
A landscape 3:2 photo is proportionally wider than an A3 landscape sheet. If the complete photograph is fitted to A3’s 42cm width, it is 28cm high, leaving 1.7cm of spare height across the 29.7cm sheet. Centring it would leave about 0.85cm above and below, before considering a deliberate border or frame coverage.
Filling that sheet edge to edge instead requires cropping some width. Check the actual crop around heads, hands, pets and writing. You can choose a matching custom shape, a border layout or a different image; do not stretch the photograph to make it fit.
Our custom-size preparation guide explains this choice. If you already have a frame, measure its sheet space and visible opening first.
Short answers before choosing your sheet
Is A3 the same as 30 × 40cm?
No. A3 is 29.7 × 42cm. A 30 × 40cm frame is not automatically a suitable fit. Use the frame’s actual measurements, including any mount.
Will an A4 file print at A2?
The file’s name or stored paper label does not settle it. Check the actual pixels, crop and important detail at the intended enlargement. A vector design and a small photograph inside a PDF need different assessments. Ask about the file if unsure.
What if I want something bigger than A2?
Use our A1 and A0 poster guide to assess the source, viewing distance and frame. Keep the original file available.
YI2C posters are supplied unframed on smooth 230gsm matte paper. See photo poster printing and current prices, or ask us about your photograph and dimensions.
Compare current poster sizes and prices. Choose the size that fits your photograph and display, rather than assuming the largest option is always the best one.
