Have you ever been tweeting out an image that's very short and wide, maybe it's just a couple of lines of text, and it gets cropped horribly so people have to click on the image to even see the full text? Well, here you can pad that image out to the aspect ratio 16x9, which is what Twitter shows it as, so people can read your image text immediately.
This page was made by @einaregilsson, give me a shout-out on Twitter if you find it useful. You can also read the blog post about how it came to be if you're interested in the technical stuff.
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