Percy Bysshe Shelley (d. 1822), “To a Skylark” · Public domain
Make a shape
Add words and place them on a 40 by 40 grid. A word's position and size are the poem: a column of short words is a column, a long word across the middle is a line. Save it and you get a link. It stays private until you choose to send it to the gallery, and a person reviews it before anyone else can see it.
Click a word, or pick it from the list, then move it with the arrow keys or the buttons. Click an empty cell to put the chosen word there. Cells run from 1 to 40 across and down.