How can I turn a photo into a silhouette?

How do I make a silhouette from a picture on my Iphone?

How do I make a silhouette from a photo online?

Upload your photo for silhouette
  1. Use Lunapic to Silhouette your Image!
  2. Use form above to pick an image file or URL.
  3. In the future, access this tool from the menu above LunaPic > Draw > Silhouette Maker.

How do I turn a photo into a black and white silhouette?