PPI (pixels per inch) describes your image — how many pixels it packs into each printed inch. DPI (dots per inch) describes the printer — how many ink dots it sprays per inch. When a marketplace asks for “300 DPI,” the number they actually care about is your image's PPI.
What PPI really means
Your digital image is a grid of pixels — say 3000×2400 of them. That's a fixed count; it doesn't change no matter what you do. PPI only enters the picture when you decide how big to print it. Spread those 3000 pixels across 10 inches and you have 300 PPI. Spread the same 3000 pixels across 20 inches and you drop to 150 PPI — same pixels, larger print, lower density, softer result.
So PPI isn't baked into the file in any meaningful way. It's a relationship between your pixel count and your chosen print size.
What DPI really means
DPI is a property of the printing hardware. An inkjet might lay down 1440 dots of ink per inch to reproduce your image; those dots blend to form the colors you see. It's a manufacturing spec, not something in your file. You'll rarely set DPI yourself — the printer does.
The reason the terms blur together is that both describe “detail per inch,” and for decades software (Photoshop included) has labeled the image-resolution field “DPI” when it technically means PPI. So in everyday seller-speak, “300 DPI” and “300 PPI” mean the same thing: make sure the image has 300 pixels for every printed inch.
The one formula that matters
Everything comes down to a single relationship:
Rearranged the other way: pixels needed = print size (inches) × PPI. Learn these two and you never guess about print quality again.
Examples:
- A 3000×2400 px image at 300 PPI prints sharp at 10×8 inches (3000 ÷ 300 = 10).
- Want an 8×10 print at 300 PPI? You need 2400×3000 px (8 × 300, 10 × 300).
- That same 3000×2400 file stretched to 20×16 inches falls to 150 PPI — fine for a poster viewed from a distance, soft for a greeting card.
How much resolution do you actually need?
More is not always required. The right PPI depends on how close the print will be viewed:
| PPI | Quality | Best for |
|---|---|---|
| 300 PPI | Sharp at arm's length | Photo prints, greeting cards, art prints, apparel (DTG) |
| 150 PPI | Good from a step back | Posters, large canvas, banners |
| 72–96 PPI | Screen only | Web images, thumbnails — never for print |
| 10–30 DPI | Fine from far away | Billboards, viewed across a street |
This is why a billboard can be printed at a fraction of a photo's density — nobody inspects it from 30 cm away. Match the resolution to the viewing distance, not to a superstition about “always 300.”
The trap: changing the number doesn't change the pixels
Here's the mistake that catches people constantly. In image software you can type “300” into the resolution field, but if “resample” is unchecked, you've changed nothing about the actual pixels — you've only re-labeled the intended print size. A 1000×1000 px image tagged “300 DPI” is still just 1000×1000 pixels; it'll print sharp at about 3.3 inches and blurry at 10, regardless of the tag.
The only way to genuinely add pixels is to resample (upscale), and interpolated pixels are guessed, not real detail — so upscaling a small file to hit a pixel target rarely looks good. The honest fix is to start from a large enough source.
Screens ignore it entirely
One more clarifier: on screens — your Etsy listing, a website, social media — the DPI/PPI tag is completely ignored. Only the pixel dimensions matter. A 2000×2000 px image looks identical whether it's tagged 72 or 300. That tag only wakes up when the file goes to a printer. (For screen sizing, see our Etsy image sizes guide.)
A rule of thumb for viewing distance
If you ever need to judge resolution without a chart, use this: the closer something is held, the more PPI it needs. Anything examined in the hand — cards, prints, book pages, apparel — wants around 300 PPI. Anything viewed from a meter or two — posters, canvases — is comfortable at 150 PPI. Anything seen across a room or a street — banners, signage, billboards — can drop far lower, often below 50. Doubling the viewing distance roughly halves the PPI you need, which is why enormous prints don't require enormous files.
Put it into practice
You don't have to do the arithmetic by hand. Drop any image into the Etsy & Amazon Resizer and it instantly shows the effective DPI at common print sizes, the largest size you can print at 300, and a custom-size check — all in your browser. And when you need to hit an exact pixel target for a marketplace, the Marketplace Image Resizer resizes and pads to spec in one click.
Remember the formula, match PPI to viewing distance, and never trust a resolution tag to create pixels that aren't there. That's the whole of DPI vs PPI.