DPI

DPI (dots per inch) measures print resolution, while the related term PPI (pixels per inch) measures screen resolution — both affect how sharp an image appears at a given physical size.

Related workflow terms: Pixel Density, Retina Screenshot.

DPI vs PPI

DPI and PPI are frequently confused because they both describe density — how much visual information is packed into a physical inch. But they measure different things.

PPI (pixels per inch) describes screen displays. A 27-inch monitor running at 5120x2880 pixels has a PPI of about 218. A standard 27-inch 1440p monitor has a PPI of about 109. Higher PPI means smaller, sharper pixels and crisper text and images on screen.

DPI (dots per inch) describes printers. A 300 DPI printer places 300 dots of ink per inch on paper. Higher DPI means finer detail and smoother gradients in the printed output.

When someone says a screenshot is "72 DPI" or "300 DPI," they are usually referring to a metadata tag embedded in the image file. This tag does not change the actual pixel content — it only tells software and printers how to scale the image for a given physical size.

How DPI affects screenshots

For screenshots viewed on screen, DPI metadata is largely irrelevant. The image displays pixel-for-pixel (or scaled by the browser or viewer) regardless of what the DPI tag says. A 1920x1080 screenshot looks the same on screen whether its metadata says 72 DPI or 300 DPI.

DPI becomes important when a screenshot is printed or placed in a print-layout document. At 300 DPI, a 1920x1080 screenshot prints at about 6.4 x 3.6 inches. At 72 DPI, the same image prints at about 26.7 x 15 inches — much larger but far less sharp per inch.

For screenshots destined for print, what actually matters is having enough pixels. A high-DPI (Retina) display captures at 2x or 3x the visible dimensions, producing an image with enough pixels to print sharply at 300 DPI and a reasonable physical size.

DPI and print vs screen

• Screen use (web, documentation, presentations) — DPI metadata does not affect display quality. Focus on pixel dimensions instead. A 1440-pixel-wide screenshot is a 1440-pixel-wide screenshot regardless of DPI.
• Print use (reports, posters, manuals) — DPI determines the physical print size at a given quality level. Target 300 DPI for professional print, 150 DPI for acceptable quality on internal documents.
• Mixed use — when the same screenshot must work on screen and in print, capture at the largest pixel dimensions practical. High-DPI display captures (2x or 3x) provide enough resolution for both use cases.

This is why screenshot teams should decide early whether an asset is screen-first or print-first. If the output is a web article, dashboard, or changelog, DPI metadata is mostly noise. If the same capture will be dropped into a PDF report or printed appendix, pixel dimensions suddenly matter much more.

Common mistakes

• Changing DPI metadata and expecting better quality. Setting a 1920x1080 image to 300 DPI does not add pixels. It just tells the printer to render the existing pixels smaller. The quality per inch is determined by the pixel count, not the metadata tag.
• Assuming 72 DPI is "screen resolution." This is a legacy convention from early Macintosh displays. Modern screens range from about 100 to over 400 PPI. The 72 DPI tag has no meaningful effect on how the image appears on a modern screen.
• Printing low-resolution screenshots at large sizes. A screenshot from a standard-density display has limited pixels. Printing it at poster size produces a blurry result. Capture on a high-DPI display or at a larger viewport if print output is needed.
• Confusing DPI with image quality. DPI describes density at a physical size. Quality depends on the source pixel count, the format, and the compression settings. A 300 DPI label on a heavily compressed JPG does not make it a high-quality image.