This post explains what PDF DPI is and shows you how to check/increase/lower DPI in PDF. If you are also interested in managing PDF DPI, read this post now! Here, MiniTool PDF Editor offers you the corresponding steps to check/increase/drop DPI in PDF.


DPI (dots per inch) measures the resolution of printing or visual display. It is usually linked to images, graphics, and documents designed for printing or electronic device viewing. The DPI in PDF is based on the screen size in inches and the total pixels both horizontally and vertically.

For example, a 200 DPI PDF indicates that the document has detailed images, each consisting of 200 small dots per inch. Please note that each tiny dot fits the specific size when you print it to keep the overall quality. Though DPI matters for images inside a PDF, the PDF format is resolution-neutral without affecting text and vector graphics.

Furthermore, the quality of a PDF remains unaffected when resizing because it doesn’t rely on a specific resolution. So, it can be concluded that the significance of DPI in a PDF primarily belongs to the quality and printing attributes of images embedded within the document.

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How to Check DPI in PDF

You can modify the DPI in a PDF file for a higher or lower resolution. Before starting the operation, you need to find out the current DPI in PDF. How to check DPI in PDF? Well, you can refer to these steps.

Step 1: Open your PDF file in Adobe Reader or Acrobat.

Step 2: Open the Image menu at the top of the window and then choose Image Size. A new window will pop up, displaying the Pixel Dimensions and Print Size of the image.

Step 3: Ensure that “pixels/inch” is selected in the drop-down menu at the bottom of the resolution. The displayed number next to Resolution is Image DPI.

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How to Increase DPI in PDF

For some reason, you need to increase DPI in PDF. For instance, you receive a notification that the DPI of your PDF is too low for printing or you want to get a higher resolution. Here comes the question: how to increase DPI in PDF. If you wonder about that too, read the content below.

Step 1: Upload the required file on Adobe.

Step 2: After uploading the file, click on the Menu option at the upper left of the main window. Then it will list a vast array of editing options.

Step 3: Click on the Print option.

Step 4: After you access the print capability of the tool, select the Advanced option from the new mini window.

Step 5: Open the DPI drop-down menu where different values to optimize the picture quality are listed.

Step 6: Choose one of the higher values than the current DPI and save changes.

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How to Lower DPI in PDF

Images look better when printed if DPI is high, but the file sizes will be larger too. Hence, if you want to make PDFs smaller for sharing online or saving space, you should lower the DPI. How to do that? Here’s the tutorial for you.

You should find a balance between image quality and compatibility based on your needs.

Step 1: After you upload the file in Adobe, hold the Ctrl + P keys to direct yourself to the Print window.

Step 2: Choose the Advanced button after accessing the print options within Adobe.

Step 3: Go to the DPI drop-down menu and choose a lower value. You can lower the value to 200 DPI PDF from a default setting of 300 DPI by typing the value manually.

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This post offers an introduction to PDF DPI and then tells you how to check/increase/lower PDF DPI respectively. You can refer to it if you want to manage your PDF DPI.

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