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Image Resolution Converter

Free Image Resolution Converter — Convert DPI, PPI, Dots Per CM & Pixels Per MM Instantly

Convert image resolution between any units instantly with OmniConverter's free online image resolution converter. 1 DPI equals 0.394 dots per centimeter, and 1 PPI equals 1 dot per inch. Supports DPI, PPI, dots per meter, dots per centimeter, and pixels per millimeter. Whether you're preparing print files, optimizing digital images, or working with DICOM standards, our converter delivers precise resolution conversions.

How It Works

Convert in three simple steps.

1

Enter the Image Resolution Value

2

Select Source and Target Resolution Units

3

View Your Converted Resolution

Popular Conversions

Common Benchmarks

Reference

1 DPIDPI

1 DPI

Reference

1 DPIPPI

1 PPI

Reference

1 DPIdot/m

39.3700787402 dot/m

Reference

1 DPIdot/cm

0.3937007874 dot/cm

Reference

1 DPIdot/mm

0.0393700787 dot/mm

Reference

1 DPIpx/cm

0.3937007874 px/cm

Reference

1 DPIpx/mm

0.0393700787 px/mm

Real-World Use Cases

Image resolution conversion is used in graphic design and prepress (ensuring print files meet 300 DPI requirements), photography (optimizing images for web vs print at appropriate PPI), digital imaging and scanning (archiving at 600 DPI, web at 72 PPI), professional printing (matching printer DPI specs with image PPI), medical imaging (DICOM standard resolutions), web and UI design (high-DPI/retina display asset preparation), and cartography (satellite and aerial image resolutions).

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Frequently asked questions

Quick answers to common conversion questions

What is DPI?+

DPI stands for dots per inch, a measure of printing resolution that indicates how many ink dots a printer can place in one inch.

What is PPI?+

PPI stands for pixels per inch, a measure of digital image resolution that describes how many pixels fit in one inch of a screen display.

What is the difference between DPI and PPI?+

DPI refers to printed dots (output), while PPI refers to digital pixels (input). They are often used interchangeably but measure different things.

How do I convert DPI to dots per centimeter?+

Divide DPI by 2.54 to get dots per centimeter, since one inch equals 2.54 centimeters.

How do I convert DPI to PPI?+

DPI and PPI are numerically equivalent — 300 DPI equals 300 PPI. The difference is contextual (print vs. display).

What resolution should I use for printing?+

300 DPI is the standard for high-quality print. 150 DPI works for lower quality, and 72 DPI is typical for web images.

What is the standard resolution for web images?+

72 PPI is the traditional standard for screen display, though modern high-DPI screens may use 144 PPI or higher for retina displays.

How do I convert pixels per centimeter to DPI?+

Multiply pixels per centimeter by 2.54 to get DPI.

What is medical DICOM resolution?+

DICOM medical imaging typically uses resolutions between 72 and 300 DPI depending on the modality and diagnostic requirements.

Can I convert between all resolution units?+

Yes, all image resolution units are directly convertible using fixed ratios based on the inch-centimeter relationship.

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