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Step 1: First, we open the computer desktop, select the installed PS (photoshop) to open and import the materials (as shown in the picture).

Step 2: Then select the cropping tool, select 1:1 square as the ratio, and click OK (as shown in the picture).

Step 3: Then select Crop Tool → Slice Tool again, then right-click on the picture, select Divide into Slices, set both horizontal division and vertical division to 3, and then click OK (as shown in the picture).

Step 4: Then select File→Export→Save as format for Web (as shown in the picture).

Step 5: Finally, select Storage, save to the location you want to save, and click OK (as shown in the picture).

The above is the entire content of how to create a nine-square grid in Photoshop brought to you by the editor. I hope it can help you.