The simplest and best site I've used is https://postimages.org/

https://postimages.org/

It is sooo easy.

1. Go to their page
2. Click on "Choose Image"
3. Open your picture file
4. Double Click on the picture you want
5. A new page will open on postimage
6. Copy the "Direct Link"
7. Paste the direct Link in your email, post, whatever.

You do have to have the picture in your picture file, so copy the picture and save in your picture file.