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DPI / PPI

DPI measures print resolution while PPI measures screen resolution — understanding both ensures proper image quality.

What is DPI / PPI?

DPI (Dots Per Inch) and PPI (Pixels Per Inch) are resolution measurements where DPI applies to printed images and PPI applies to digital screens. DPI determines how many ink dots a printer places per inch, while PPI determines how many pixels a screen displays per inch. For web images, only pixel dimensions matter since browsers ignore PPI metadata, but print requires 300 DPI at the intended print size for sharp results.

Importance of DPI / PPI

Understanding DPI vs PPI prevents common image quality mistakes when preparing images for different uses. Web images optimized at 72 PPI reduce file sizes without affecting screen display quality, while print images require 300 DPI to avoid pixelation. This knowledge helps you choose the right resolution settings when compressing or resizing images for web, social media, or email use.

DPI / PPI in Practice

A photographer uploads a 3000×2000 pixel image from their camera, which contains 300 PPI metadata. When shared on Instagram, the platform displays it at 1080×1080 pixels regardless of the PPI setting, but the file size remains unnecessarily large. Reducing the PPI to 72 in an image editor can cut file size by 30-40% without changing how the image appears on screens, making it ideal for web use.

DPI / PPI Best Practices

  • → Set images to 72 PPI when optimizing for web, social media, or email to reduce file sizes.
  • → Use 300 DPI only when preparing images for print at their final print dimensions.
  • → Focus on pixel dimensions rather than PPI when sizing images for digital platforms.
  • → Check your camera or phone settings to avoid capturing unnecessarily high PPI for web-only images.

Example of DPI / PPI

A wedding photographer has a 4000×3000 pixel image at 300 PPI (file size: 8.2 MB). For their website gallery, they reduce the PPI to 72 while keeping the same pixel dimensions, resulting in a 2.1 MB file that displays identically on all screens. However, when printing an 8×10 inch photo, they maintain 300 DPI to ensure the printed image contains enough detail for sharp results at that physical size.

Related Terms

ResolutionPixel dimensions

Frequently Asked Questions

What is DPI vs PPI?

DPI (Dots Per Inch) measures resolution for printed images, while PPI (Pixels Per Inch) measures resolution for digital screens. DPI refers to how many ink dots a printer places per inch on paper, whereas PPI refers to how many pixels a screen displays per inch. For web images, PPI is metadata that doesn't affect display quality, but for print, 300 DPI is required for sharp results.

Do web images need 300 DPI or 72 PPI?

Web images only need 72 PPI because browsers ignore PPI metadata and display images based on pixel dimensions alone. Using 300 DPI for web images creates unnecessarily large file sizes without improving screen display quality. Save 300 DPI only for images intended for print at their final print size.

What happens if I use 72 DPI for printing instead of 300 DPI?

Using 72 DPI for print results in pixelated, blurry images because there aren't enough dots per inch to create smooth details on paper. Print requires 300 DPI at the final print size to ensure sharp, professional-quality results. The same image file can be 72 PPI for web use and 300 DPI for print by adjusting the resolution setting without changing pixel dimensions.