Check the post before it goes live
A caption that looks fine in a text box can break awkwardly once it's a real post — a line that wraps badly, an opening that gets cut off, an image cropped the wrong way. This generator renders your text and image in each platform's own card, with the right header and action bar, so you can catch those things first.
Type your post, add a name, avatar and image, then switch between platforms and light or dark mode. It's the same write-once, see-everywhere idea behind Donivo — everything runs in your browser and nothing is uploaded.
Catch the first-line cut-off
The thing a preview catches best is the opening. Every feed shows only the first line or two before a "more" link, and a different amount of text fits on X than on LinkedIn or Instagram. Seeing your post as a real card makes it obvious whether your hook survives the cut-off, whether your image crops cleanly, and whether the whole thing reads the way it did in your head.