Here and in all examples below, substitute the 144 portion with your actual DPI value. If you are running a window manager without a full featured DE (for example, Fluxbox), you must create or modify the /home/your user name/.Xresources file and add the following line: Xft.dpi: 144 No desktop environment/barebones window manager I'll review some common cases which will give you an idea of what to do. How to change the DPI valueĭepending on the graphical desktop environment you are using, the procedure can be different. For my screen, I need to use 144 as my DPI value.

Finally, divide your screen resolution values by inch values.

In my case, the values are as follows: 13.39in x 7.48in. The output contains the physical display size in millimeters.

Get your screen size in millimeters by running the command: xrandr | grep -w connected.To calculate the proper DPI value, do the following.

If this value is not correct, you can calculate it yourself. The line 'resolution' shows the actual value. Type or copy-paste the following command: xdpyinfo | grep -B 2 resolution.However, this just serves to confuse things further as the DPI (or PPI) value is only relevant (in practice) outside of the digital world.To find the current DPI value of the screen used by Xserver, do the following. A printer produces dots and a monitor produces pixels, so this name attempts to provide context when an image is digital. One other thing to note is that the DPI value of a digital image is sometimes also referred to as PPI (or Pixels Per Inch). You may change your DPI to any value you like. This tool supports JPG, PNG, TIF, BMP and ICO. However, it is much simpler to change the DPI of an image using the tool provided above. The printer would then output a larger number of dots for every inch, resulting in a sharper image.Īn image DPI value may be changed by opening the file inside MS (Microsoft) Paint, Adobe Photoshop or Illustrator. For example, a printing shop may request that a photo is submitted with 300 DPI rather than 72 DPI. The DPI value is read by some devices (such as printers) to determine how your image should be presented on a medium (such as paper). The actual quality (resolution) of the image (within the file itself) is not affected when its DPI value is adjusted. The DPI (dots per inch) of an image is simply metadata embedded inside the image (header). Your new image (with your chosen DPI) will instantly download to your device.Select your image file (press the 'choose image' button).Choose a new DPI value (by clicking on the number bar e.g.Use this free tool to change the DPI of your image instantly

How to find dpi of pdf