$ previewer run x-post
Write your post, drop in an image, and see exactly how it will render on X — character limit, image crop, and dark mode included. Free, no login.
280 characters left
Click or drop an image here
// text saves to this browser only — images are never uploaded anywhere
Launching our summer collection this Friday ☀️ Tap the link to get early access before it sells out.
// why this matters
Go one character over and your post won't send. The live ring counter shows exactly how much room you have left as you type.
X crops images to fit the feed. Uploading here shows the same aspect ratio so you catch a bad crop before it's public.
A big chunk of your audience reads X in dark mode. Toggle the preview to make sure your image and emoji still read well on black.
// what's inside
A real-time 280-character counter, styled after X's own compose ring, so you always know your limit.
Attach a photo and see it rendered inside the mockup at the same size and position as a real post.
Flip on the checkmark to see how your post reads with a verified badge next to your name.
Switch instantly between X's light and dark display modes without leaving the page.
Export your preview as a PNG to share with a client or teammate for approval.
Nothing here connects to X. It's a private, local mockup — nothing is ever published for you.
// how it works
$ type-your-post // watch the character ring as you go
$ attach-an-image // optional, drag and drop or click
$ check-light-and-dark // then copy it into X
$ ▍
// writing tips
The first line is what shows in notifications and quote-tweets. Put the actual point there, not the setup.
A single, well-cropped image usually reads clearer than a busy collage. Preview it here before you decide.
If people are likely to quote you, keep your post under ~250 characters so their comment doesn't feel cramped.
Light text on a transparent image can vanish on a black background. The dark toggle catches this in seconds.
// faq
Standard posts on X are limited to 280 characters. This tool counts characters live and warns you when you go over the limit.
Yes. Upload an image and it will appear inside the mockup exactly where it would in a real post, so you can check the crop and composition.
No. This is a preview-only tool. It never connects to your X account and never publishes anything on your behalf.
Yes. Use the light/dark toggle above the preview to check how your post renders in both of X's display modes.
Your draft text is saved only in your own browser's local storage so it survives a refresh. Uploaded images are not saved and nothing is sent to a server.