Good work. Just one thing: Please change the default color of the highlighter tool from black (which most of the time censors, not highlights text) to the standard yellow highlighter color. Also the default color for text should probably be red?
Oh, one more thing. I would appreciate it a lot if you added a little padding around to the screenshots when selecting an area, like f.x. when selecting a paragraph, it would be very nice if the edge of the screenshot was not at the exact edge of the text, but a few pixels outside, so there’s a bit of “white space”/padding around the text.