Is there a way to shrink pictures in questions and answers?

Question

When I add pictures to questions or answers, they're often way too large. Is there a way to make them smaller?

Answer 1

From Resizing an image in a post?:

Where the original might be something as obscene as this:

http://i.stack.imgur.com/R7QBb.jpg

Slip your hand in with m or s before the file extension like so:

Medium:

http://i.stack.imgur.com/R7QBbm.jpg

Smaller:

http://i.stack.imgur.com/R7QBbs.jpg

You can whack in good ol' HTML for that and force client-side resize:

<img src="http://example.com/path-to-ghosts.jpg" width="100" height="100">

But, it's up to you to work out what a good set of resize dimensions will be.