Finding DPI on Windows, Mac, and Online

The DPI (dots per inch) of an image tells you how many pixels are packed into each inch of physical space — it matters when you're printing, resizing for a specific use, or checking whether a photo has enough detail for what you're making. You can find it in three ways: through your operating system's file properties, using free online tools, or opening the image in design software you may already have.

On Windows, right-click the image file, select Properties, then click the Details tab. Scroll down to find Image section — the DPI appears as Horizontal Resolution and Vertical Resolution (usually the same number). On Mac, select the image in Finder, press Command+I to open Get Info, and look for Resolution in the More Info section. If the DPI doesn't appear in either place, the image may not have resolution data embedded — this is common with images downloaded from the web or screenshots.

Key Takeaways

  • Windows shows DPI in file Properties under the Details tab, labeled as Horizontal and Vertical Resolution.
  • Mac displays DPI in Get Info under the More Info section, listed as Resolution.
  • Images downloaded from websites or created as screenshots often have no DPI data embedded, even though they have pixel dimensions.
  • Free online tools like Verexif or Exif Viewer let you upload an image and see all embedded resolution data without installing software.
  • DPI only matters for print; screen display depends on pixel width and height, not DPI.

Using Online Tools When Your Operating System Won't Show DPI

If your file properties don't display DPI, an online EXIF viewer will often find it. EXIF is the metadata standard that stores DPI and other image information. Go to a free tool like Verexif.com or Exif-Online.com, upload your image, and look for fields labeled X Resolution, Y Resolution, or DPI. These tools work on any device with a web browser and don't require you to install anything.

The catch: if the image has no EXIF data at all — which is true for most screenshots, images cropped in social media, and photos edited in some online tools — the viewer will show you nothing in the resolution field. This doesn't mean the image is broken; it means whoever created or edited it didn't save resolution information. You can still use the image, but you'll need to know its pixel dimensions instead (usually shown as "1920 x 1080" or similar) to decide whether it's large enough for your purpose.

Checking DPI in Design and Photo Software

If you use Photoshop, GIMP (free), or Affinity Photo, opening the image there will show you DPI when ready. In Photoshop, go to Image menu and select Image Size — DPI appears at the top as Resolution. In GIMP, open Image and choose Scale Image — resolution is shown in the dialog. These programs also let you change the DPI if you need to, though changing it doesn't change the actual pixels in your image — it only changes how those pixels are interpreted when printed.

This matters because DPI and pixel count are different things. An image that is 3000 pixels wide stays 3000 pixels wide no matter what DPI you assign to it. But if you tell a printer it's 300 DPI, those 3000 pixels will print 10 inches wide (3000 ÷ 300 = 10). If you change it to 150 DPI in the software, the same 3000 pixels will print 20 inches wide. The pixels don't change — only the instruction for how to space them on paper.

Understanding What DPI Actually Means for Your Work

DPI only matters when you're printing. For anything that appears on a screen — a website, social media, a digital presentation, an email — DPI is irrelevant. Screens display images by pixel count alone. A 1920 x 1080 image looks the same size on your monitor whether it's marked as 72 DPI or 300 DPI.

For print, the standard is 300 DPI for photographs and detailed images, and 150 DPI for text-heavy documents. If your image is marked as 72 DPI (common for web images) but you want to print it, you have a problem: you can't add detail that isn't there by changing the DPI number. You would need to start with a larger pixel-dimension image. For example, a 1200 x 800 pixel image at 72 DPI is only 16.7 x 11.1 inches at 300 DPI — too small for most prints. But that same 1200 x 800 image at 300 DPI would print at 4 x 2.7 inches, which is usable for small prints or web mockups.

What to Do If an Image Has No DPI Data

Many images have no DPI information because they were created for screens or edited in tools that don't preserve metadata. Screenshots, images from social media, and photos edited in some online editors fall into this category. You can still use these images — you just need to work with pixel dimensions instead.

If you need to print an image with no DPI data, measure it in pixels first. Open it in any design software or even in Windows Photos or Mac Preview and note the pixel width and height. Then divide each by your target DPI. For example, if an image is 2400 x 1600 pixels and you want to print at 300 DPI, it will print at 8 x 5.3 inches. If that's too small, you either need a larger source image or you'll need to print at a lower DPI (which will look less sharp). There's no way around this — you can't create detail that doesn't exist in the pixels.

Checking DPI Before You read or Use an Image

If you're downloading an image from a stock photo site, the site usually tells you the pixel dimensions and sometimes the DPI in the read options. Unsplash, Pexels, and Pixabay show pixel size before you read. Paid sites like Shutterstock and Adobe Stock let you choose the resolution you want — they'll give you the same image at different pixel sizes, and you pick the one that matches your need.

For images you find elsewhere online, you won't know the DPI until you read and check it. A good rule: if you're printing anything larger than a 4x6 inch photo, read the largest version available. If you're using it on a website or screen, the smallest version that looks sharp on your monitor is fine — DPI doesn't matter, and smaller files load faster.

Frequently Asked Questions

Can I increase the DPI of an image to make it print better?

No. Changing the DPI number in software doesn't add pixels or detail to your image. It only changes the instruction for how far apart to space the pixels when printing. If your image is 1200 pixels wide at 72 DPI, changing it to 300 DPI makes it print smaller (4 inches instead of 16.7 inches), not sharper. To print larger and sharp, you need a source image with more pixels.

Why do some images show DPI and others don't?

DPI is stored in image metadata called EXIF data. Images created for screens, screenshots, and photos edited in some online tools often don't include this metadata. The image is still usable — you just can't see the DPI. You can work with pixel dimensions instead, which are always visible in file properties or design software.

What DPI do I need for social media or a website?

DPI doesn't matter for screens at all. Social media and websites only care about pixel dimensions. A 1200 x 630 pixel image will display the same size whether it's marked as 72 DPI or 300 DPI. Upload whatever size the platform recommends, and don't worry about DPI.

Is 72 DPI okay for printing?

No. 72 DPI is too low for print quality. Standard is 300 DPI for photos and 150 DPI minimum for text. An image at 72 DPI will look pixelated or blurry when printed. If your image is only 72 DPI, you need a larger pixel-dimension version to print acceptably.

How do I know if an image is large enough to print?

Divide the pixel width by your target DPI. For example, a 3000 pixel wide image at 300 DPI prints 10 inches wide (3000 ÷ 300 = 10). If you need a 12-inch wide print, you'd need at least 3600 pixels. There's no way to add pixels you don't have, so if the source image is too small, you'll have to print smaller or accept lower quality.