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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

DPI to PPIPPI to DPIDPI to Dots/cmDots/cm to DPIPPI to Pixels/cmPixels/cm to PPIDPI to Dots/mDots/m to DPIDPI to Dots/mmDots/mm to DPIPPI to Dots/cmDots/cm to PPIPixels/cm to Dots/mmDots/mm to Pixels/cmDots/cm to Dots/mmDots/mm to Dots/cm

Common Benchmarks

Reference

1 DPI → DPI

1 DPI

Reference

1 DPI → PPI

1 PPI

Reference

1 DPI → dot/m

39.3700787402 dot/m

Reference

1 DPI → dot/cm

0.3937007874 dot/cm

Reference

1 DPI → dot/mm

0.0393700787 dot/mm

Reference

1 DPI → px/cm

0.3937007874 px/cm

Reference

1 DPI → px/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.

Latest Blog Posts

Tips, guides, and insights about unit conversions

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Quick Answer: Image Resolution Converter

Convert image resolution instantly — enter any value and get all units at once. Common resolution conversions include DPI to PPI (1 DPI = 1 PPI), DPI to dots per cm (100 DPI = 39. Image resolution conversion is critical for print preparation (300 DPI), web optimization (72-96 PPI), large-format banner printing, photo lab submissions, and scanning archival documents.

How the Image Resolution Converter Works

Our image resolution converter converts between DPI (dots per inch), PPI (pixels per inch), and metric resolution units like dots per centimeter and dots per millimeter, so your images print or render at exactly the right density.

Formula & Sources

DPI/PPI are reciprocals of dot pitch. 1 in = 25.4 mm exact (BIPM). 300 DPI → 118.11 dots/cm.

Worked Example

Example: 300 DPI = 118.11 dots/cm. 8×10 inch print at 300 DPI = 2400×3000 px.

Common Image Resolution Conversions

Common resolution conversions include DPI to PPI (1 DPI = 1 PPI), DPI to dots per cm (100 DPI = 39.37 dots/cm), and PPI to pixels per mm (300 PPI ≈ 11.81 px/mm). Print standard is 300 DPI; screen standard is 72-96 PPI.

When to Use Image Resolution Conversion

Image resolution conversion is critical for print preparation (300 DPI), web optimization (72-96 PPI), large-format banner printing, photo lab submissions, and scanning archival documents.

Accuracy & Common Mistakes

All factors are stored unrounded and computed in double precision. We avoid cumulative rounding by converting via a base unit. Always verify critical results with a second source for safety-critical tasks.

Frequently Asked Questions

What DPI for print?

300 DPI is the standard for high-quality print (118 dots/cm).

What PPI for web?

72–96 PPI is typical for screens. Use 300 PPI only for print.

How to calculate print size?

Print width = pixels ÷ DPI. Example: 2400 px ÷ 300 DPI = 8 inches.

Popular Image Resolution comparisons

Jump directly to a side-by-side comparison — no typing needed. Also discoverable via search.

Dot per inch → Pixel per inch→Dot per inch → Dot per meter→Dot per inch → Dot per centimeter→Dot per inch → Dot per millimeter→Pixel per inch → Dot per meter→Pixel per inch → Dot per centimeter→
View all comparisons

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