Printing Photos as Large Posters
A sharp phone photo can fill a wall — a forwarded thumbnail cannot. Check pixels before you pick A1.
Upload Photo for PosterQuick answer: A large poster from a photo needs enough pixels for the size and viewing distance. A 4000×3000 phone file is comfortable near 12×16 in at 300 DPI and can fill 24×36 if viewed from a sofa. WhatsApp forwards and screenshots usually fail. Upload the original; PrintPosters warns if the file will look soft.
Enlarging is simple arithmetic and an honest conversation about distance. Take the long side in pixels and divide by 300 — that is the largest print in inches that still looks “photo lab” at arm’s length. Divide by 150 instead if the poster will live above a sofa and nobody will inspect pores. Wedding photographers delivering 6000-pixel files can go A1 or 24×36 with room to spare. Festival candids saved from status downloads cannot. We would rather you drop to A3 than pay for a blurry A0. Crop tightness matters too: a face that is 800 pixels wide inside a 4000-pixel frame is still an 800-pixel face when you zoom the poster. Use original HEIC or JPG from the camera roll, not an edited story export, and let the uploader show the warning instead of hoping the lab will “sharpen it”.
Photo pixels → largest sensible poster
| Longest side (px) | Comfortable @300 DPI | Sofa-distance @150 DPI |
|---|---|---|
| 1800 | 6 in (stay on 4×6 / A6) | 12 in — still tight |
| 3000 | 10 in | 20 in (A3-ish) |
| 4000 | 13 in | 27 in (near 24×36 if you stand back) |
| 6000 | 20 in | 40 in (A1 / A0 with distance) |
Soft-file warnings we see every week
- WhatsApp “document” that is still 1280 px wide
- Instagram download instead of the camera original
- Screenshot of a Lightroom preview
- AI upscale that adds texture but not real eyelashes
- Heavy beauty filters that smear skin at A2
Frequently Asked Questions
Can you AI-upscale my photo for A0?
We do not invent real detail. If the checker flags the file, pick a smaller size or send a higher-resolution original.
Will a 12 MP iPhone print 24×36?
Often yes at sofa distance if you upload the original, not a share-sheet resize. We still show a warning if effective DPI is low.
Photo print or poster for a large portrait?
Poster art paper for graphic crops and big sheets; 270 GSM photo paper when you want satin album colour at moderate sizes. See the vs-photo-prints landing.
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