1. Click Choose File and select the image you would like to grid.
2. Click Load Canvas to load the image to the canvas.
3. Click the spot you would like to set as the first reference point.
4. Click the second spot you would like to build the grid off of.
5. If you want a new grid, refresh the page and repeat the above steps.
6. If you are happy with the grid, click "Download to myImage.jpg" to download your image with a grid.
Image to use:
Canvas: