X (formerly Twitter) doesn't show your post exactly as followers will see it until after you publish. The composer shows your text and image thumbnails, but not the timeline layout, the final image crops, or the link preview. Editing is limited too: only X Premium subscribers can edit a post, up to 5 times within 1 hour of posting (X Help: edit post). Everyone else has to delete and repost, losing any replies and reposts.
A two-minute preview catches most mistakes before they're public. This guide covers what to check and how.
Quick Answer
To preview a tweet before posting:
Check the character count against X's 280-character limit — links count as 23 characters and emoji as 2.
Paste the text into a preview tool to check line breaks, hashtags, and @mentions.
Add your images in posting order and check how each one crops.
Open the linked page and check its preview image — X shows only the image and domain.
View the post in light and dark themes.
WebToolsPlanet's free X post preview tool does steps 1, 2, 3, and 5 in your browser without connecting to your account or posting anything. Its character counter uses X's counting rules.
Step 1: Check the Character Count
A standard X post can contain up to 280 characters, but X doesn't count every character as one. According to X's developer documentation:
Every link counts as 23 characters, however long or short the URL is.
Every emoji counts as 2 characters.
Chinese, Japanese, and Korean characters count as 2 each, so a post in those languages holds up to 140 of them.
A draft that looks short can still be over the limit. The Tweet Generator counter applies these rules for you. A general character counter shows the raw count, so subtract the difference for any long links yourself.
Long posts: X Premium subscribers can post up to 25,000 characters (X Help: X Premium). In the timeline, a long post is cut off with a "Show more" link, so put the most important point in the opening lines.
Step 2: Check Line Breaks and the First Line
Line breaks make a post easier to scan, but each blank line pushes your message further down.
Read the post at timeline width, not in a wide document.
Check that lists and line breaks survive pasting from your notes app.
Make sure the first line works on its own, because many people read nothing else.
Step 3: Check Hashtags, Mentions, and Links
In a preview, hashtags, @mentions, and URLs are highlighted in blue, which makes mistakes obvious:
a hashtag cut short by punctuation —
#launch-daybecomes#launch,a misspelled @mention,
a link joined to the previous word without a space.
One or two relevant hashtags are enough. Long hashtag strings look like spam and use up characters.
Step 4: Check How Your Images Crop
X allows up to four photos in a post (X Help: posting pictures or GIFs) and crops them to fit its layout:
1 image: full width, usually close to 16:9.
2 images: two tiles side by side, heavily cropped left and right.
3 images: one tall tile and two small stacked tiles.
4 images: a 2×2 grid of small tiles.
Add your images to the Tweet Generator in the order you'll post them. Click each image to adjust its crop position and check that faces, products, and text stay inside the tile. For images that need a very different shape, crop them first with an image cropper. For recommended sizes, see X post image sizes and media layouts explained.
Also write alt text for each image when you post — X allows up to 1,000 characters per description (X Help: image descriptions).
Step 5: Check the Link Preview
When a post contains a link, X builds a preview card from the linked page's Open Graph or X Card metadata. Since October 2023, X has shown that card as the page's image with the domain name in the corner — the headline and description aren't shown in the timeline (TechCrunch).
Before posting a link:
open the page and check that its preview image is current and readable on its own,
if you manage the page, set or check its image with an Open Graph generator,
put the key message in your post text, not only in the linked page's headline,
remember that X caches previews, so a just-updated image may not appear straight away.
To see the card next to your text, switch the Tweet Generator's media panel to Link Card, keep the Current X style, and upload the page's preview image.
Step 6: Check Light, Dim, and Dark Themes
Followers use different themes. A dark logo on a transparent background can disappear on a black timeline, and a bright graphic can glare on a dark one. Switch the preview between Light, Dim, and Dark before posting any branded image.
Step 7: Check the Feed View First
Most people see your post in the timeline, where it is compact and shows a short timestamp such as "2h". Fewer open the full post, which shows the full date and engagement totals. Check the Feed Post view first, because that's where the post has to earn attention.
Example: Previewing a Launch Post
Draft: "Big news 🎉🎉 Our spring collection is here — 12 new colours, recycled fabrics, and free shipping this week only. Shop now: https://example.com/spring-collection-2026 #SpringCollection #SustainableFashion #NewIn"
What the preview catches:
Character count: the long URL counts as only 23 characters and each emoji as 2, so the post fits — no need to shorten the link.
Hashtags: three long hashtags wrap onto their own line at timeline width. Cutting to
#SpringCollectionmakes the post cleaner.Images: in a two-image post, the model in the second photo is cropped at the shoulder. Moving the crop position left fixes it.
Link preview: the product page's preview image is last season's banner. Updating it before posting avoids an outdated card.
Pre-Posting Checklist
Within 280 characters, or the hook is in the first lines of a long post?
First line strong enough on its own?
Hashtags and @mentions spelled correctly and highlighted?
Images in the right order, with subjects inside every crop?
Alt text written for each image?
Linked page shows a current, readable preview image?
Looks good in both light and dark themes?
Sharing a Preview With Your Team
If someone else approves your posts, share an image of the preview instead of describing it. Download it as a PNG or use Copy Image to paste it into Slack, email, or a review document. Turn on the optional Mockup label for anything shared outside your team. For a full approval workflow, see how to create a tweet mockup for presentations and client approvals.
Related Tools and Guides
Tweet Generator — X post preview: preview text, images, and themes before posting.
Word Counter: check raw character counts against several platforms' limits.
Image Cropper: crop images to fit X's layouts.
Open Graph Generator: set the preview image for your own pages.
How to spot a fake tweet screenshot: why screenshots of posts aren't proof.
More tools for social content are in the Social Media Toolkit and the social tools category.
FAQ
Does X have a built-in tweet preview?
Not a full one. The X composer shows your text and image thumbnails, but not the timeline layout, the final image crops, or the link preview card. A separate preview tool fills that gap.
Will previewing my tweet post it or connect to my X account?
No. WebToolsPlanet's Tweet Generator only draws an image of the post in your browser. It doesn't sign in to X, publish anything, or upload your text and images.
How many characters does a link use in a tweet?
Every link counts as 23 characters on X, regardless of its actual length, because X shortens all links with its t.co service.
Can I edit a tweet after posting it?
Only X Premium subscribers can edit posts, up to 5 times within 1 hour of posting. Other accounts have to delete the post and publish it again.
Why does my link preview show an old image?
X caches link previews. If you've just changed the page's preview image, the old one can appear for a while. Check the page's Open Graph image tag first.
Preview Your Next Post
Paste your next post into WebToolsPlanet's free Tweet Generator, add your images, and check it in feed view before you hit Post.
Sources
Tools mentioned in this guide