Convert raster image density between DPI, PPI, DPCM, DPMM, and LPI without changing physical print size.
Resolution
Compare density units used for display and print workflows without turning the value into a physical size.
Common densities
Density only, no size math
This converter keeps the workflow focused on density terms only. Use the print-size helper when you need pixels, inches, or output area calculations.
Result
300 DPI resolves to 300 DPI. PPI tracks the same numeric density for raster workflows, while DPCM and DPMM are the print-side equivalents.
Screen density
Display and raster labels that commonly travel with interface assets.
Print density
Press-oriented labels used when comparing output density on paper.
Guidance
DPI and PPI are numerically interchangeable in most raster workflows. DPCM and DPMM are the same density expressed in metric units, and LPI is included here for comparison with print screening terms.
Also in Typography & Design
Density Reference
A digital image resolution converter helps you compare density labels without mixing them up with physical print size. That is useful when one workflow talks about DPI or PPI, another uses metric density such as dots per centimetre or millimetre, and a print discussion introduces lines per inch as a screening reference.
Resolution density tells you how tightly pixels or dots are packed into a unit of length. It does not, by itself, tell you the final physical size of the image. You need separate size data for that.
That distinction matters because it keeps this converter separate from a print-size helper. The density sheet answers how one unit label compares with another, not how many inches a file will print at.
DPI and PPI often carry the same numeric value in planning conversations, even though they describe slightly different concepts in strict technical use. Metric density units such as DPCM and DPMM express the same density through centimetres or millimetres instead of inches.
LPI is different again: it is commonly used when discussing screen ruling in print workflows. It is useful as a related reference, but it should not be confused with physical output size.
DPCM = DPI / 2.54
Converts an inch-based density into dots per centimetre.
DPMM = DPI / 25.4
Converts an inch-based density into dots per millimetre.
DPI = DPCM × 2.54
Converts metric density back into the inch-based reference used by many tools.
Common presets such as 72, 96, 150, and 300 DPI are practical shortcuts because they mirror the labels people see in design tools, web references, proofing, and print preparation. The context label is not a law; it is a fast reminder of where a density value usually appears.
Use this converter when you need to compare labels cleanly across tools or documentation. Switch to the print-size helper only when the question becomes how large something will print or how many pixels a target size requires.
Frequently asked questions
In many planning conversations they are treated as numerically interchangeable, but they refer to slightly different ideas. PPI usually refers to image pixel density, while DPI more often refers to output dot density.
Because density alone is not enough to determine physical output size. You also need pixel dimensions or a target width and height, which is a different workflow handled by a print-size helper.
They are metric ways of expressing the same density, which helps when documentation, print equipment, or production notes use centimetres or millimetres instead of inches.
LPI is included as a related print-screening reference so density conversations stay in one place, but it should be interpreted as a screening term rather than as a physical output-size instruction.
Related
These related calculators come from the same leaf category, nearby sibling categories, or the same top-level topic.
Convert one colour between HEX, RGB, HSL, HSV, and CMYK with normalized output for web and print handoff.
Compare ISO and North American paper sizes in portrait or landscape, with physical dimensions and pixel dimensions at common DPI settings.
Convert typography measurements between points, pixels, millimetres, centimetres, inches, and picas with selectable DPI assumptions.
Convert CSS font-size values between px, rem, em, pt, pica, and percent using a configurable base font size.
