This tool will apply a grid and grayscale to your reference photo (without needing to use any tedious software).
Step 1: Upload your reference photo below ("Choose File").
Step 2: Wait a moment while your photo is processed.
You will get three versions of your reference photo: one grid; one grayscale; one with both. Then right-click on each image and save to your computer (if you are on a phone or tablet, press down on each image and save from there).
(If you need reference photos, check out my Reference Photo Library).
Any issues, let me know.