I think things have updated. The way I can get an image to resize is adding https://steemitimages.com/300x300 before a link to any image somewhere, where 300x300 can be whatever value. Thus the whole code would be: https://steemitimages.com/300x300/https://insertlink.   
Hope this helps!

thanks - simply explained and will be following the advice you give for #images I post from now on.

Thanks!

Not every image has that exact url form.  But this trick still works!  And it kicks the ass off having to go do it elsewhere before posting.  I dropped an image in the text editor and it came up as "https://steemitimages.com/..." followed by a lot of other random crap and then the name of the file somewhere in there.  

I simply added this before it "https://img1.steemit.com/300x800/" so that I now had "https://img1.steemit.com/300x800/https://steemitimages.com/..." and it worked! 

Thanks for the awesome trick!

not working! or is this just working with the editor?

# Great trick! thanks!!!

Nice find @rossenpavlov, thanks for sharing!!!

This trick no longer seems to work...

Vielen Dank, sehr nützlicher Hinweis. Das erspart das Resizen vorab.

Thanks for your help !

I'm sorry, this no longer is how the image codes are shown... At least not from uploading on my computer.

Very useful trick! Thanks for sharing it!

Ooh, thank you ever so much! 
Much appreciated info. :)

Thank you

Thanks, this is the one trick i was looking for!

Unfortunately, it didn't work for me, but I found an app for my laptop called Picollage. (See the pictures on my blog) If you don't want the watermark, you just purchase it for $1.99. https://steemit.com/streetart/@miketravels/street-art-of-the-northern-quarter-manchester

I tried with gifs, but it didn't work.
Is there a way to resize gifs?

Thanks, very useful post -- just used the trick!

Very cool! Thanks!!!

https://steemit.com/images/@reveurgam/how-to-resize-an-image-on-steemit

<p>This post has been ranked within the top 50 most undervalued posts in the second half of Jan 02. We estimate that this post is undervalued by $7.78 as compared to a scenario in which every voter had an equal say.</p> 
<p>See the full rankings and details in <a href="https://steemit.com/curation/@screenname/the-daily-tribune-most-undervalued-posts-of-jan-02---part-ii">The Daily Tribune: Jan 02 - Part II</a>. You can also read about some of our methodology, data analysis and technical details in <a href="https://steemit.com/curation/@screenname/introducing-the-daily-tribune-most-undervalued-posts-of-nov-04---part-i">our initial post</a>.</p>
<p>If you are the author and would prefer not to receive these comments, simply reply "Stop" to this comment.</p>