In Quick Paint, choose a canvas size, add a layer, and set brush size, color and opacity. Test a short stroke before drawing the main shape.
Use the eraser on the intended layer, and undo to compare a change. Touch input works on mobile; stylus pressure support depends on the browser and selected tool.
Save a Quick Paint .layerly project to continue later. Full Studio adds retouching and Smudge: drag to move and mix color, release to apply, or Escape to cancel. Smudge supports up to 8 megapixels; save the Full Studio JSON project too.