Understanding DPI (Dots Per Inch) is key to knowing how clear your images will look when printed or displayed on a screen. This guide explains the difference between 72 DPI (best for screens) and 300 DPI (best for printing) and shows you how to check your image size on a computer or phone. It also includes a simple formula to calculate how big your image can be printed without losing quality. Perfect for beginners who want to ensure their photos and artwork look their best!
What is DPI?
DPI stands for Dots Per Inch. It tells you how detailed or sharp an image is when printed. The higher the number, the clearer and more detailed the image.
72 DPI – Good for screens (web, emails, social media).
300 DPI – Best for printing (posters, flyers, artwork).
How to Check Your Image Size and DPI
On a Windows Computer
Find your image file – Open the folder where your image is saved.
Right-click the image and choose Properties.
Click on the Details tab.
Look for Dimensions (shows width and height in pixels) and DPI (listed as resolution).
On a Mac Computer
Find your image file in Finder.
Right-click the image and select Get Info.
Look under More Info to find Dimensions and DPI.
On a Smartphone or Tablet
Phones don’t usually show DPI, but you can check image size:
Open the Photos app or Gallery.
Find your image and tap on it.
Look for an info button (or three dots menu) to see size details.
How Big Can You Print Your Image?
To print an image, you need to know:
Image size in pixels (width × height)
DPI needed for printing (usually 300 DPI)
Quick Calculation
To find out how big your image can print:
Take the width in pixels and divide by 300 = Maximum print width in inches.
Take the height in pixels and divide by 300 = Maximum print height in inches.
Example: If your image is 3000 × 2400 pixels
3000 ÷ 300 = 10 inches wide
2400 ÷ 300 = 8 inches high
Your image can print at 10 × 8 inches at 300 DPI.
If the DPI is lower than 300, the print might look blurry or pixelated.
Final Tips
* For online images 72 DPI is fine.
* For printing, always aim for 300 DPI.
* If your image is too small, resizing it won’t improve quality.
If you’re unsure, ask a printer or a tech-savvy friend for help!
