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Notes on turning a post into a picture — the device shortcuts, the export sizes that survive a platform’s re-compression, and the decisions behind the tool itself.

Three kinds of thing get written about here. The first is mechanical: which key does what on which device, and which number belongs in which field. The second is what happens to an image after you upload it — platforms crop and re-encode, and most of the reason a tweet card looks bad in a feed was decided before you pressed post. The third is the tool itself: what it does, what it deliberately refuses to do, and why.

Everything here is written against the editor on the home page, so the numbers are the real numbers — a 598px card, a 2× export at 1196px, 3:4 and 9:16 crops that centre the card vertically. If you want the setting-by-setting reference rather than the essays, the guide has it.

Start here

The tool is on the home page and needs no account — paste the text, fill in the numbers, export a PNG. The guide covers every setting one by one, and the about page explains how the card is rendered and where the resemblance to X stops.

Found something that renders wrong? That is the most useful thing you can send: thirdweb30@gmail.com.