Use pixels per inch, or PPI, to compare an image file with its intended print size. About 150–200 PPI is a useful planning range for wall art, while 300 PPI is a common reference for closer-viewed photo prints. These values guide a size decision; they do not guarantee sharpness or repair missing detail.
PPI describes the image; DPI describes the printer
PPI is the number of image pixels distributed across one inch of the finished print. DPI describes a printer’s dots per inch. The terms are sometimes used loosely, but a printer’s high DPI specification cannot supply detail missing from the image you upload.
A 4,000-pixel edge printed across 20 inches provides 200 PPI. Across 40 inches, the same edge provides 100 PPI. Nothing about the file changed; the pixels are simply spread over a larger area.
Calculate the pixels for your chosen size
Required pixels = print inches × target PPI. Calculate both edges and use dimensions after cropping. The table shows exact arithmetic for several print sizes; it does not account for whether the image is in focus.
| Print size | At 150 PPI | At 200 PPI | At 300 PPI |
|---|---|---|---|
| 8 × 10 in | 1,200 × 1,500 px | 1,600 × 2,000 px | 2,400 × 3,000 px |
| 11 × 14 in | 1,650 × 2,100 px | 2,200 × 2,800 px | 3,300 × 4,200 px |
| 16 × 20 in | 2,400 × 3,000 px | 3,200 × 4,000 px | 4,800 × 6,000 px |
| 24 × 36 in | 3,600 × 5,400 px | 4,800 × 7,200 px | 7,200 × 10,800 px |
| 36 × 48 in | 5,400 × 7,200 px | 7,200 × 9,600 px | 10,800 × 14,400 px |
Match your expectations to the viewing distance
People often inspect a small portrait from much closer than a large print across a room. Close viewing, fine handwriting, small faces, and detailed line work make defects easier to notice. Lower pixel density may be acceptable for a larger piece seen from farther away, especially when the source is already clean.
Check the actual source and enhanced proof rather than picking a PPI number in isolation. Higher density is useful only when the pixels carry convincing detail. Artificial sharpening, compression blocks, and missed focus can remain visible in a large output file.
Changing a resolution label does not improve the photo
When resampling is disabled, changing a file’s resolution setting changes its suggested print dimensions without changing its pixel count. When resampling is enabled, software adds or removes pixels. Neither changing a label nor producing a larger file proves that the original scene has been recovered.
If your file is too small for the size you want, retrieve a better original, compare a smaller print, or preview AI upscaling. Then review the subject and crop before ordering. Adobe’s guidance below explains the distinction between changing print dimensions and resampling.
Further reading
Adobe: changing print dimensions and resolutionHow do I know if my photo is print ready?
Compare the cropped pixel dimensions with the intended print size, then inspect focus, compression, and the final proof. Pixel density is a planning estimate, not a guarantee of visual quality.
Review your enhanced proofUpscale your photo with AI
Upload your image, compare the enhanced proof with your original, then choose the size and frame that suit the result.