Stop Twitter from compressing your images
When you embed any static image onto Twitter, it tries to compress it down as a JPEG to save bandwidth. For photos, that’s usually fine; JPEG was designed for photos. But digital art, infographics, and screenshots usually look their best in the PNG image format. If you upload those as PNGs, Twitter will still compress them into JPEGs, and they might come out crappy. Here’s how to fix that.
Game developer Andi McClure noticed Twitter’s compression when she uploaded a crisp PNG screenshot full of pastel color blocks, and Twitter spit out a JPEG cluttered with compression artifacts. (If you click to zoom in, you’ll see it all around that one-pixel blue line that cuts through the purple.)
See more on Lifehacker here ==> https://lifehacker.com/stop-twitter-from-turning-your-pngs-into-jpgs-1822461989