March 18, 2024

Set a specific Width, Height, and DPI

Example: we have a square image from the internet, and we need to make it 9" x 3.7" at 300 DPI. We will do it for free using

*** 300 DPI means that we should have 300 Dots (pixels) Per Inch. If we multiply 9 inches by 300 pixels per inch, our image should be 2700 pixels wide. 3.7 x 300 = 1100 pixels tall.

We have a square image, but 9 x 3.7 inches is not a square. We will resize our image first (while keeping the width / height ratio), and then, we will crop it (cut away parts at the top and the bottom of the square), to get a wide rectangle.


Open your image in Photopea (File - Open), and then, press Image - Size. Set the units to Inches, and set the Width to 9 and the Height to 9 (one side should have the required size, another can be larger - we will cut it later). Set the DPI to 300, and press OK.


The easiest way to crop is using the Canvas Size. Press Image - Canvas Size, set the units to Inches, and enter the reqizred size of 9" x 3.7". Press OK, and we are done! Now, press File - Export As - JPG, and save the result to your computer :)


Image Size stretches the content of the image. If there was a car in our image, which was 2 inches big, we can make it 3 inches big. Canvas Size ignores the content, it only cuts away parts from the sides. The size of each object stays the same.

Do you need help? Ask us at our Reddit!