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The best size for AI art prints, in centimetres
1K, 2K and 4K in print sizes at 300 and 200 dpi, what each costs in credits, why aspect ratio comes before size, and the 23-credit route to a print of the picture you actually chose.
For a print, generate at 4K. At 300 dpi that is about 34 cm on the long edge — roughly A3 framed. 2K gives you 17 cm, a book page. 1K gives under 9 cm, which is small even for a postcard. On aikizi those three sizes cost 8, 16 and 24 credits on Nano Banana Pro, and there is a cheaper route to a big print that most people miss.
The sizes, in centimetres
| Generated size | Long edge | At 300 dpi | At 200 dpi | Credits · Pro |
|---|---|---|---|---|
| 1K | 1024 px | 8.7 cm | 13.0 cm | 8 |
| 2K | 2048 px | 17.3 cm | 26.0 cm | 16 |
| 4K | 4096 px | 34.7 cm | 52.0 cm | 24 |
300 dpi is the normal figure for a photographic print held in the hand. 200 dpi is defensible for something that hangs on a wall and is looked at from a metre away, and it buys you half as much again in every direction. A poster seen from across a room can go lower still.
The cheaper route to a large print
Here is the part that saves credits. Each generated size is a separate generation, not one picture at different resolutions. Run the same prompt at 1K, 2K and 4K and you get three different pictures — in our test the garland was coiled, then draped, then ringed, and the lamp moved each time.
So generating at 4K to get a print means accepting whatever composition 4K hands you. The alternative is to choose the picture small and then enlarge it:
A picture like this is the case where the aspect ratio decision bites hardest. It was generated 3:2 because that is what photographic paper and most frames are; had it come out 16:9, fitting it to a 3:2 frame would have cost about a quarter of the width — pixels bought and thrown away.
- Draft at 1K, 8 credits — or 2 credits on Nano Banana 2 Lite — until the composition is one you would hang.
- Check it properly for errors: hands, text, reflections, anything with a countable number of parts. Never enlarge a mistake; the upscaler renders it beautifully.
- Upscale the one you chose, 15 credits. The composition survives.
- Decide your print size from the pixels you now have, at 300 dpi for held prints and 200 for wall pieces.
Aspect ratio before size
Pick the shape first, because cropping later throws pixels away. The presets are 1:1, 4:5, 16:9 and 9:16, plus 3:2 and 2:3 for photographic proportions. A 3:2 or 2:3 frame matches standard photographic paper and most off-the-shelf frames; 4:5 suits gallery-style mounts; 1:1 is the safest if you have not chosen a frame yet. A 16:9 image cropped to fit a square frame loses about 44% of its width, which is the same as paying for a size you did not get.
What actually makes a print look good
Not resolution, past a point. Three things resolve at 4K that do not at 1K, and all three are material: stone reads as individual grains rather than noise, flowers separate into petals, metal shows patina rather than a smooth gradient. If your picture's subject is a surface — fabric, skin, metal, stone, food — the pixels earn their keep. If it is a simple shape against a plain sky, a 2K file printed at 200 dpi will look identical and cost 8 credits less.
FAQ
What size should I generate for an AI art print?
4K, which prints at about 34 cm on the long edge at 300 dpi — roughly A3 framed. 2K gives about 17 cm and 1K under 9 cm. On Nano Banana Pro those cost 24, 16 and 8 credits.
Is there a cheaper way to get a print-sized image?
Yes. Draft at 1K for 8 credits until the composition is right, then upscale for 15 — 23 credits total, and you keep the picture you chose. Generating at 4K for 24 gives you a different picture, because each size is its own generation.
What dpi do I need?
300 dpi for a print held in the hand, 200 for something hanging on a wall and seen from a metre. At 200 dpi a 4K file reaches about 52 cm instead of 35.
Which aspect ratio should I choose?
Choose it before you generate, because cropping later throws away pixels you paid for. 3:2 and 2:3 match standard photographic paper and most frames, 4:5 suits gallery mounts, and 1:1 is safest if the frame is not decided.
Does 4K always look better in print?
Only when the subject is a surface — fabric, skin, metal, stone. There the extra pixels resolve real texture. For a simple shape against a plain background, a 2K file at 200 dpi looks the same and costs 8 credits less.
Draft one picture at 1K in the Studio and upscale the one you would hang — that is the whole print workflow. The three sizes compared at full size are in part 3 of the generation series.