When you buy printable wall art, the size you choose matters less than the shape. Every print has an aspect ratio, the relationship between its width and height, and that ratio decides which frames it will fit without cropping or white gaps.
This guide explains the ratios you’ll meet most often, which frame sizes belong to each one, and how to check a file before you print it.
What an aspect ratio actually tells you
A 2:3 ratio means that for every 2 units of width there are 3 units of height. An 8×12 inch print and a 24×36 inch poster are both 2:3, so the same file prints at either size without changing the composition. A 30×40 cm print is 3:4, a different shape, even though the sizes look close on paper.
That is why a digital download usually comes as several files: one per ratio. Pick the file that matches your frame’s ratio, then print it at the size you need.
The most common ratios and the frames that fit them
| Ratio | Common sizes | Good to know |
|---|---|---|
| 2:3 | 4×6, 8×12, 12×18, 16×24, 20×30, 24×36 in | Ready-made 24×36 frames are easy to find in the US. |
| 3:4 | 6×8, 9×12, 12×16, 18×24 in · 30×40 cm | Slightly wider than 2:3. Popular for desk and shelf frames. |
| 4:5 | 4×5, 8×10, 16×20 in · 40×50 cm | 8×10 in is one of the most common frame sizes. 11×14 in is close but not exactly 4:5. |
| 5:7 | 5×7, 10×14 in · 50×70 cm | 50×70 cm is a classic European poster size. |
| A series (1:1.414) | A5 148×210, A4 210×297, A3 297×420, A2 420×594, A1 594×841 mm | Each size is half the one above it, so the shape stays identical. |
A2 is not the same as 5:7
It is easy to assume that A-series paper and 5:7 are interchangeable, because both are tall and narrow. They aren’t. A-series sizes use a ratio of about 1:1.414, while 5:7 is 1:1.4. On an A2 sheet that small difference adds up to a few millimetres, enough to leave a thin gap or trim the edge of an illustration.
If you want an A-size print, use a file made for the A series. If you have a 50×70 cm frame, use the 5:7 file.
How to choose the right file in four steps
- Measure the frame opening, not the outside of the frame. If you use a mount (passe-partout), measure the window in the mount.
- Divide width by height. 0.67 is 2:3, 0.75 is 3:4, 0.8 is 4:5, about 0.71 is 5:7 or A series.
- Pick the matching file from your download. Most listings say which ratios are included, so check before buying.
- Print at “actual size” or “100%”, not “fit to page”, so the printer doesn’t shrink or stretch the image.
What about resolution?
For prints you’ll see up close, around 300 pixels per inch is a comfortable target. An 8×10 inch print at that density needs a file of about 2400×3000 pixels. A large poster viewed from across the room can work with less. A “300 DPI” label on its own doesn’t tell you much: what matters is the file’s pixel dimensions compared with the size you want to print.
Quick answers
Can I print a 2:3 file in a 3:4 frame?
Yes, but something has to give: either part of the image is trimmed, or you get white space on two sides. A mount with a custom window can hide the difference neatly.
Which ratio is best for a gallery wall?
Any of them, as long as you plan for it. Mixing two ratios, for example 4:5 and 2:3, often looks more relaxed than lining up identical frames.
Find a print that fits
Elif’s prints are sold as digital downloads through her Etsy shop, ElunaraStudio. Each listing shows which sizes are included.
