Image Resolution Checker – Check Pixel Dimensions & DPI Online

Image resolution and print quality

Image resolution — measured in pixels — determines the maximum print size at any given quality. The relationship is simple:

        Print Width (inches) = Pixel Width ÷ DPI

        Print Height (inches) = Pixel Height ÷ DPI

A 6000×4000 pixel photo at 300 DPI prints at 20″×13.3″ with professional quality. At 72 DPI, the same file would theoretically print at 83.3″×55.6″ — but at such low resolution that the result would be blurry and pixelated. Resolution checker tools help you verify these dimensions before sending files to a print shop.

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Frequently Asked Questions

What is a good image resolution for printing?

300 PPI (pixels per inch) is the professional standard for photo printing. At this resolution, individual dots are imperceptible to the human eye at normal viewing distance. For large-format prints viewed from a distance, 150–200 PPI is acceptable.

How many megapixels do I need for a high-quality print?

For an 8×10 inch print at 300 DPI you need 2400×3000 = 7.2 megapixels. For A3 (11.7×16.5 inches) at 300 DPI you need 3510×4950 = ~17.4 megapixels. Use the custom DPI calculator on our DPI Checker to see the exact requirements for your image.

My image looks high-quality on screen — why won't it print well?

Screens display at 72–144 PPI, so images look sharp on-screen even at low resolutions. Print requires much higher pixel density — 300 PPI. An image that fills your screen at 72 PPI may only print at 3–4 inches at 300 PPI print quality. Always check pixel dimensions before printing.