How to find DPI in three ways
DPI (dots per inch) tells you how many pixels are packed into each inch of a printed image. You check it by opening the image file in software that reads its metadata — the hidden information stored inside the file itself. On Windows, right-click the image and look at Properties. On Mac, select the image and press Command+I for Get Info. Online, use a free tool like Verexif or Exif.tools that reads the file without uploading it anywhere permanent.
The number you find matters if you plan to print the image or enlarge it. A photo from your phone is usually 72 DPI, which looks fine on a screen but blurry at 8x10 inches on paper. A professional photo or scan is often 300 DPI, which prints sharp. If you need to resize an image for print, knowing the current DPI tells you whether you have enough detail to work with.
Key Takeaways
- DPI is stored in the image file's metadata, which you can read through Properties on Windows, Get Info on Mac, or a free online tool.
- Most photos from phones and cameras are 72 DPI, which is fine for screens but too low for sharp printing at large sizes.
- Professional prints and scans are usually 300 DPI or higher, and you cannot add detail by changing DPI alone — you need the original file to have enough pixels.
- Different software shows DPI in different places: Windows Properties shows it under the Details tab, Mac Get Info shows it under More Info, and online tools display it when ready after upload.
Checking DPI on Windows
Right-click the image file and select Properties from the menu. A window opens showing basic information like file size and date modified. Click the Details tab at the top of that window. Scroll down until you see a section labeled Image. Under that section, you will see two numbers: Horizontal and Vertical. Both are measured in pixels per inch — that is your DPI.
If the Details tab does not show image information, the file may be corrupted or saved in a format Windows does not recognize fully. Try opening the image in Windows Photos instead: right-click the image, select Open with, then Photos. Once it opens, click the three dots menu in the top right and select Properties. The DPI appears under Image dimensions.
Checking DPI on Mac
Select the image file in Finder and press Command+I, or right-click and choose Get Info. A window opens showing file details. Look for a section labeled More Info or Image. Under that section, you will see Resolution listed as a number followed by pixels per inch (ppi) — Mac uses ppi and dpi interchangeably. That number is your DPI.
If Get Info does not show resolution, open the image in Preview instead. Press Command+I while the image is open in Preview, or go to Tools menu and select Inspector. The resolution appears in the window that opens. You can also go to Tools > Adjust Size to see the current DPI and change it if needed, though changing the number in Preview does not add detail — it only changes how the file reports its resolution.
Using online tools to check DPI without installing software
Verexif.com and Exif.tools both read image metadata in your browser without storing the file. Go to either site, click the upload button, and select your image. The tool displays the resolution when ready. Look for a field labeled Resolution, DPI, or Pixels Per Inch. Most tools show both horizontal and vertical resolution if they differ.
These tools work on any device — phone, tablet, or computer — and do not require you to install anything. They are useful if you are checking an image on a borrowed device or do not want to dig through software menus. The trade-off is that you are uploading the file to a third-party server, so avoid these tools if the image contains sensitive information. For private files, use the built-in tools on your own device instead.
What DPI means for printing and screen use
Screen images are typically 72 DPI because screens display pixels directly — the DPI number does not affect how the image looks on your monitor. Print is different. A printer needs at least 150 DPI to avoid visible pixelation, and 300 DPI is the standard for photos and documents that need to look sharp. Anything above 300 DPI adds file size without improving print quality noticeably.
The total number of pixels in the image matters more than the DPI number alone. A 1000 x 1000 pixel image at 72 DPI is roughly 14 x 14 inches at print quality. The same image at 300 DPI is only 3 x 3 inches. You cannot change DPI to make a small image print larger without losing sharpness — you need the original file to contain more pixels. If you have a 72 DPI image and need to print it at 300 DPI, you have to go back to the original source and re-scan or re-photograph it.
Changing DPI in common image editors
Photoshop, GIMP, and Paint.NET all let you change the DPI number stored in a file, but changing it does not add or remove pixels. Go to Image menu and select Image Size (Photoshop) or Scale Image (GIMP). You will see three numbers: width, height, and resolution. Change the resolution number and click OK. The file now reports a different DPI, but the image itself looks identical on screen and prints at a different physical size — not a different quality.
Changing DPI is useful only if you are preparing a file for a specific print size and your printer needs the metadata to be correct. If you actually need a higher-quality image for printing, you need to start with a file that has more pixels. Rescanning a document at 300 DPI instead of 72 DPI, or using a higher-resolution camera setting, are the only ways to gain actual detail.
Why DPI matters less than you might think
Many people assume that DPI is the main factor in image quality, but pixel count is what actually determines sharpness. A 4000 x 3000 pixel image at 72 DPI contains the same detail as the same image at 300 DPI — the DPI just tells the printer how large to print it. A small image with high DPI will still print small. A large image with low DPI will print large but blurry.
The confusion happens because professional images often have both high pixel counts and high DPI, while phone photos have lower DPI. The DPI is not the reason the professional image looks better — it is the pixel count. If you are resizing an image for web use, DPI does not matter at all. Websites ignore the DPI metadata and display images based on pixel dimensions alone.
Frequently Asked Questions
Can I increase DPI to make an image sharper for printing?
No. Changing the DPI number in software does not add pixels or detail to the image. It only changes how large the printer will render the existing pixels. If you need a sharper print, you need to start with a file that has more pixels — either a higher-resolution original photo or a re-scan at higher DPI.
What DPI do I need for different print sizes?
For a sharp print, multiply your desired print width and height in inches by 300 to find the minimum pixel dimensions you need. A 4x6 inch print needs at least 1200 x 1800 pixels. A 8x10 inch print needs at least 2400 x 3000 pixels. If your image has fewer pixels, it will look blurry at that size no matter what DPI you set.
Does DPI affect how an image looks on my screen?
No. Screens display images based on pixel dimensions, not DPI. A 1000 x 1000 pixel image looks the same size on your monitor whether it is labeled 72 DPI or 300 DPI. DPI only matters when you print the image or prepare it for professional printing.
Why does my phone photo show 72 DPI?
Phone cameras default to 72 DPI as a standard for screen display, even though the image may contain millions of pixels. The low DPI number does not mean the photo is low quality — it just means the phone assumes you will view it on a screen, not print it. You can still print a phone photo at high quality if it has enough total pixels.
What is the difference between DPI and PPI?
DPI (dots per inch) and PPI (pixels per inch) are used interchangeably for digital images. DPI technically refers to printer output, while PPI refers to screen pixels, but most software and people use the terms the same way. When you check image metadata, both numbers mean the same thing.