Image sizing in posts (with img tag)

[sweetandeasy]

Just curious if there's a way, using a code or markdown, to resize a linked image so it's more well-behaved in the body of a post. Or would I just need to make a smaller version to use in a post?

 

[jaF0]

Or would I just need to make a smaller version to use in a post?

That. I try to stay under 800px wide and 100K total file size.

 

[sweetandeasy]

That. I try to stay under 800px wide and 100K total file size.

Thanks, what I suspected but wanted to check. Appreciate it!