I often prefer to draw diagrams on paper, take photo and then use software to covert it to SVG. Ideally I find a good too that can convert it to an easily edita

I often prefer to draw diagrams on paper, take photo and then use software to covert it to SVG. Ideally I find a good too that can convert it to an easily editable format. Any ideas? I think better on paper. Or I'm on the go and have to get my idea down.