Launchpack by Świt Studio
Free tool

Link preview checker

Paste a URL to see how it looks when shared on X, LinkedIn, Facebook, Slack and iMessage, and get a short list of what to fix.

Try: ·

What the checker looks at

It fetches your page once, the way X, LinkedIn and Slack's crawlers do: no JavaScript, no login. Then it checks:

  • The tags: og:title, og:description, og:image, twitter:card, og:url or canonical, and the favicon.
  • The image: that the URL is absolute, that it downloads, its file type, file size and pixel size.
  • The page: its HTTP status and redirects.

Each problem comes with the fix. If the checker says everything is fine but a platform still shows the wrong preview, it's almost always that platform's cache. The OG image not showing guide walks through all nine causes and how to refresh each platform.

The tags a good preview needs

Paste these into your page's <head> and change the values. The image URL must be absolute.

<meta property="og:type" content="website">
<meta property="og:url" content="https://yourdomain.com/">
<meta property="og:title" content="Your product: what it does">
<meta property="og:description" content="One sentence on who it's for and why.">
<meta property="og:image" content="https://yourdomain.com/og-image.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta name="twitter:card" content="summary_large_image">

Keep the title under about 60 characters and the description under about 155. Longer text still works, but most platforms cut it off.

No OG image yet?

Launchpack makes a 1200×630 OG image from your name, tagline and a screenshot in 30 seconds. Free.

Make my OG image

Questions

Does the Twitter Card Validator still work?

X removed the preview from its Card Validator in 2022. To see the real card, paste your URL into the post composer on x.com and look at the preview under the text box without posting. This checker shows what X will read from your tags.

Can I use an SVG or WebP as my og:image?

Don't use SVG: most platforms ignore it. WebP works on many platforms but not on every app that unfurls links, so JPG or PNG is the safe choice.

How accurate are the previews?

They're close approximations of each platform's current layout, drawn from the same tags and image the platforms read. Each platform changes its design from time to time, so check the real composer before a big launch.

Do you store the URLs I check?

No. The page is fetched once to read its tags, and nothing is saved or logged.