What resolution do you need for an A3 pet photo print?
An A3 pet portrait needs 3,507 × 4,962 pixels for a true 300 DPI print, or 2,338 × 3,308 pixels at a more forgiving 200 DPI. That is about a 17 MP camera if the photo needs no cropping.
The international large format. Slightly larger than 12x16 and a good deal taller than 11x14, so it needs its own crop rather than a rescale of either.
- Inches
- 11.69 × 16.54
- Aspect ratio
- 1:1.415
- Pixels at 300 DPI
- 3,507 × 4,962
- Pixels at 200 DPI
- 2,338 × 3,308
Check your photo against A3
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Will a phone photo print at A3?
Here is where the cameras people actually own land at this size, with the crop to 1:1.415 already accounted for. If you know the megapixel count but not the pixel dimensions, start from what you can print from a 12 MP photo — the size every phone saves by default — or compare every megapixel count against every print size.
| Source | Pixels | DPI at A3 | Verdict |
|---|---|---|---|
| iPhone main camera, 12 MP | 3,024 × 4,032 | 243 | Acceptable framed |
| iPhone 48 MP ProRAW / HEIF Max | 6,048 × 8,064 | 487 | Prints sharp |
| Recent Samsung Galaxy, 12 MP | 3,000 × 4,000 | 241 | Acceptable framed |
| Photo sent through WhatsApp | 900 × 1,200 | 72 | Too small |
| Instagram download | 1,080 × 1,350 | 81 | Too small |
| Entry-level DSLR, 24 MP | 4,000 × 6,000 | 342 | Prints sharp |
Common mistakes at A3
- Dividing raw pixels by inches. It ignores the crop to 1:1.415 and overstates the DPI, sometimes badly.
- Upscaling and calling it 300 DPI. Resampling a small file up to 3,507×4,962 produces a file with the right dimensions and none of the detail. The metadata says 300 DPI; the print says otherwise.
- Forgetting the DPI metadata entirely. Several print services read the DPI field and will scale the image to suit it. A file with the right pixels but a 72 DPI tag can come back wrong.
- Accepting a messaging-app copy. WhatsApp and Messenger recompress to roughly 1200px on the long edge, which is 72 DPI at A3. Always use the original file.
Every size, side by side
| Print size | Inches | Pixels at 300 DPI | Pixels at 200 DPI | Camera needed |
|---|---|---|---|---|
| 5x7" | 5 × 7 | 1,500 × 2,100 | 1,000 × 1,400 | 3.1 MP |
| 8x8" | 8 × 8 | 2,400 × 2,400 | 1,600 × 1,600 | 5.8 MP |
| 8x10" | 8 × 10 | 2,400 × 3,000 | 1,600 × 2,000 | 7.2 MP |
| A4 | 8.27 × 11.69 | 2,481 × 3,507 | 1,654 × 2,338 | 8.7 MP |
| 11x14" | 11 × 14 | 3,300 × 4,200 | 2,200 × 2,800 | 14 MP |
| 12x12" | 12 × 12 | 3,600 × 3,600 | 2,400 × 2,400 | 13 MP |
| 12x16" | 12 × 16 | 3,600 × 4,800 | 2,400 × 3,200 | 17 MP |
| A3 | 11.69 × 16.54 | 3,507 × 4,962 | 2,338 × 3,308 | 17 MP |
| 16x20" | 16 × 20 | 4,800 × 6,000 | 3,200 × 4,000 | 29 MP |
| 18x24" | 18 × 24 | 5,400 × 7,200 | 3,600 × 4,800 | 39 MP |
| 24x36" | 24 × 36 | 7,200 × 10,800 | 4,800 × 7,200 | 78 MP |
A3 questions
- What resolution do you need for an A3 pet photo print?
- An A3 print needs 3,507x4,962 pixels for a true 300 DPI result, or 2,338x3,308 pixels at a more forgiving 200 DPI. That is roughly a 17 MP camera if the photo needs no cropping at all.
- Can an iPhone photo print at A3?
- A standard 12 MP iPhone photo is 3024x4032 pixels, which gives about 243 DPI at A3 after cropping to the 1:1.415 aspect ratio. That is below 300 DPI but acceptable for a print hung on a wall.
- What aspect ratio is A3?
- A3 is 1:1.415 (11.69 by 16.54 inches). A phone photo is 3:4, so some cropping is required to reach 1:1.415, which is why the effective DPI is lower than raw pixels suggest.
- Do I need to add bleed to an A3 print file?
- Only if whoever prints it asks for it — a photo lab printing a framed photo usually does not. When they do, the standard is 0.125 inches on every edge, which makes the file 3,582x5,037 pixels at 300 DPI. Keep anything important well inside that margin, because the bleed area gets trimmed off.