First, go to the top of this page and find free Pixel Circle Chart
Select the number of blocks width i.e. how many blocks you want to have in a circle horizontally.

Then select the number of blocks height i.e. how many blocks you want to have in a circle vertically.

Afterward, select the type of circle you want to build. There are three options given in the drop-down menu. Select “Thin” in order to create a simple circle. That’s it your circle is ready to use.

Check the “Force Circle” option if you only want to create a circle. Selecting this option will enable automatically set the number of columns/blocks the same for both dimensions – horizontal & vertical.