FormbyGirl
Sugar Cookie : GingerScraps Praise
I am on Photoshop and, fortunately, there is an easy way to reduce pages for posting on the web. If you go to File > Export > Save for Web (Legacy). From there, you can change the page to 600x600. It displays the estimated file size in the bottom left. If it is still too large, you can reduce the quality by a point or two until it is under 500k.