What image size is best for Reddit posts?
For image posts, 1200x628 pixels works well for link previews. For direct image uploads, Reddit supports up to 20MB but images are displayed at a max width of about 960px in the feed.
Does Reddit compress uploaded images?
Yes, Reddit compresses images on upload. For best results, upload JPEG at 85-90% quality at 1200px wide. Very large images will be compressed more aggressively.