If you want to make a perfect circle on Photoshop, follow these simple steps:

  1. First, create a new document and fill it with white.
  2. Select the Ellipse tool (L) and draw an oval around your desired circle shape. Be sure to use the same size for both the oval and the circle you will create later on.
  3. Next, go to Edit > Define Pattern… and select a radial gradient from the drop-down menu. You can also use any other type of gradient if you prefer, but radial is usually more accurate when it comes to circles.
  4. Finally, set the blending mode of your pattern to Overlay and adjust the opacity until you get the desired effect. ..