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How to Check Image Resolution

Checking your image's resolution before printing takes 10 seconds on any device once you know where to look.

Chris Terry
By Chris Terry, Founder & Editor
Updated June 17, 2026

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The quickest way to check image resolution varies by device. On Windows: right-click the file, Properties, then the Details tab. On Mac: open in Preview, then Tools > Show Inspector (Cmd+I). On iPhone: in the Photos app, tap Edit and check the top bar, or use a free EXIF viewer app.

How to check on Windows

1. Right-click the image file in File Explorer.
2. Select Properties.
3. Click the Details tab.
4. Look for "Horizontal resolution" and "Vertical resolution." These show DPI, and scrolling up shows pixel dimensions (Width x Height).

How to check on Mac

1. Open the image in Preview (double-click).
2. Go to Tools > Show Inspector, or press Cmd+I.
3. The Image tab shows pixel dimensions and DPI (listed as "resolution").

How to check in Photoshop

Go to Image > Image Size. Photoshop shows pixel dimensions and document resolution (DPI) in the same dialog. You can change the resolution here without resampling to see the print size that resolution produces.

How to know if an image is 300 DPI

If the Details tab (Windows) or Inspector (Mac) shows 300 under Horizontal/Vertical resolution, the image is set to 300 DPI. Note that DPI metadata can be changed without actually adding pixels; the real test is whether the pixel dimensions are large enough for your target print size at 300 DPI. Use the DPI Calculator to check both at once. See also what resolution you need for printing for the full chart.

Try the Print Size Calculator

Enter your image pixel dimensions and target DPI to see the largest sharp print you can make, instantly.

Open the Print Size Calculator →

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Good to know

FAQs

Is there a way to check the resolution of an image?

Yes. On Windows, right-click the file and open Properties > Details. On Mac, open in Preview and press Cmd+I. In Photoshop, go to Image > Image Size. Online tools and EXIF viewers also show pixel dimensions and DPI.

How do I know if an image is 300 DPI?

Check the DPI value in the file's properties or metadata. In Windows: right-click > Properties > Details. In Mac Preview: Cmd+I. The number shown as 'Horizontal resolution' should read 300. Also confirm the pixel dimensions are large enough for your target print size at 300 DPI.

What size is a 1920 x 1080 image?

At 300 DPI, a 1920 x 1080 pixel image prints at approximately 6.4 x 3.6 inches. At 150 DPI it prints at 12.8 x 7.2 inches. The Print Size Calculator gives the exact dimensions for any DPI you choose.

Is 600 DPI the same as 600 PPI?

In print workflow terms, yes. Both describe 600 units of detail per inch in the image. When you set an image to 600 PPI in an editing application and send it to a 600 DPI printer, the densities correspond.