Link Preview Checker: Fix Social Media Previews Before You Share (2026)

A link preview checker shows you how your URL looks on Facebook, Twitter/X, and LinkedIn before you share. Learn what controls previews, how to fix broken ones, and the best tools.

You spend time crafting a post, you paste in your URL — and the preview that pops up on Facebook, LinkedIn, or Twitter/X is either completely wrong, missing an image, or shows an embarrassing placeholder from three years ago. By the time you notice, the post is live and the damage is done.

A link preview checker lets you see exactly how your URL will appear on each social platform before you hit share — so you can fix broken OG tags, update stale images, and make sure your content makes the right first impression every time.

What Is a Link Preview Checker?

When you share a URL on a social network, the platform sends a bot to your page, reads specific HTML meta tags (Open Graph tags, Twitter Card tags), and assembles a preview card — title, description, image, and domain. A link preview checker simulates this exact process and shows you the result without actually posting anything.

A good link preview checker does three things:

  • Fetches your page's meta tags the same way each social platform's scraper would
  • Renders a pixel-accurate mockup of how the preview card will look on Facebook, Twitter/X, LinkedIn, and other platforms
  • Flags missing or broken tags so you know exactly what to fix

Why you need one: Social platforms cache your preview data aggressively — sometimes for weeks. If your OG tags were wrong when your page first got shared, that wrong preview keeps showing for every subsequent share until you force a re-scrape. Catching issues before the first share is far easier than debugging them after.

How Each Platform Generates Previews

Each major social platform has its own scraping bot, its own caching behaviour, and its own set of official debugging tools. Knowing how each one works makes it much easier to diagnose and fix broken previews.

📘
Facebook
Facebook's scraper bot is called facebookexternalhit. It reads Open Graph tags and caches aggressively — previews can stay stale for days. Use the Sharing Debugger to force a re-scrape after fixing tags.
Official: Sharing Debugger (developers.facebook.com/tools/debug)
🐦
Twitter / X
Twitter reads Twitter Card meta tags first (e.g. twitter:card, twitter:image) and falls back to Open Graph if Twitter tags are absent. The Card Validator previews your card and shows any validation errors.
Official: Card Validator (cards-dev.twitter.com/validator)
💼
LinkedIn
LinkedIn reads Open Graph tags. Its bot is called LinkedInBot. The Post Inspector lets you preview and force a re-scrape. LinkedIn requires a 1200×627px image for the large preview card format.
Official: Post Inspector (linkedin.com/post-inspector)

Important: These official tools only show one platform at a time and require logging into each platform separately. A unified link preview checker like share-preview.com shows all platforms in one view, saving significant time when you're checking multiple URLs before a campaign launch.

The OG Tags That Control Your Link Previews

Open Graph (OG) tags are HTML meta tags placed in the <head> of your page. They were created by Facebook in 2010 and have become the universal standard for social preview metadata — used by every major social platform.

<!-- Required OG tags -->
<meta property="og:title" content="Your Page Title Here" />
<meta property="og:description" content="A compelling 1–2 sentence description for the preview card." />
<meta property="og:image" content="https://yoursite.com/og-image.jpg" />
<meta property="og:url" content="https://yoursite.com/page" />

<!-- Twitter / X Card tags (recommended) -->
<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:title" content="Your Page Title Here" />
<meta name="twitter:description" content="Description for Twitter card." />
<meta name="twitter:image" content="https://yoursite.com/og-image.jpg" />
Tag Priority Optimal Value
og:title Required 40–60 characters. Your page's main headline.
og:description Required 100–150 characters. One or two sentences, compelling hook.
og:image Required 1200×630px minimum, JPG or PNG, under 8MB. Absolute URL.
og:url Recommended The canonical URL of the page. Prevents duplicate caching.
og:type Recommended article, website, or product depending on content.
twitter:card Recommended summary_large_image for full-width image previews on X.
og:image:width / og:image:height Optional Helps Facebook render the image faster without re-fetching dimensions.

How to Fix Broken Previews Before Sharing

If your link preview is wrong, there are two possible causes: the OG tags on your page are incorrect (or missing), or the platform has cached an old version of your page and hasn't re-scraped yet.

Diagnosing the problem

  1. Go to share-preview.com and paste your URL
  2. Check what OG tags are actually present on your live page
  3. Compare what the preview shows vs. what the tags say
  4. If tags are correct but preview is wrong → stale cache. If tags are wrong → fix the tags first

Fixing missing or wrong OG tags

If you're on WordPress, a plugin like Yoast SEO or Rank Math manages OG tags via a simple UI — no code required. If you're on a custom site or Next.js/Gatsby, add the tags directly to the <head> section. Most modern frameworks (Next.js, Nuxt, SvelteKit) have built-in Head components that make this straightforward.

Forcing a re-scrape (clearing the cache)

After fixing your OG tags, each platform needs to re-scrape your page before the new preview shows:

  • Facebook: Go to the Facebook Sharing Debugger, paste your URL, and click "Scrape Again". The preview updates immediately in the tool and within minutes in the feed.
  • Twitter/X: Use the Card Validator at cards-dev.twitter.com/validator. Twitter's cache typically clears within a few hours without intervention, but the validator forces immediate re-check.
  • LinkedIn: Use the LinkedIn Post Inspector. Paste your URL and click "Inspect". LinkedIn re-scrapes on demand and shows the updated preview instantly.

Pro tip: If you're doing a major update to a page's OG image (e.g. a product launch), add a cache-busting query parameter to the image URL: og:image content="https://yoursite.com/og.jpg?v=2". This forces every platform to treat it as a new image and re-fetch it, bypassing any image-level CDN cache.

Best Link Preview Checker Tools

  • ⭐ Featured Free

    share-preview.com

    Check how your URL looks on Facebook, Twitter/X, LinkedIn, and more — all in one unified view. Shows which OG tags are present, flags missing tags, and renders pixel-accurate preview mockups. No login required for basic checks. The fastest way to audit a URL before a campaign launch.

  • Facebook Sharing Debugger

    developers.facebook.com/tools/debug — Facebook's official tool. Essential for forcing a re-scrape after fixing tags. Requires a Facebook login. Shows Facebook-specific preview rendering and error messages.

  • Twitter Card Validator

    cards-dev.twitter.com/validator — Twitter/X's official preview tool. Validates Twitter Card tags and shows how summary and summary_large_image cards render. Requires a Twitter login.

  • LinkedIn Post Inspector

    linkedin.com/post-inspector — LinkedIn's official scraping tool. Shows the preview card exactly as it will appear in the LinkedIn feed and allows on-demand re-scraping. Requires LinkedIn login.

  • opengraph.xyz

    A simple OG tag inspector that shows raw tag values and a basic preview mockup. Useful for quick raw-tag audits but doesn't provide per-platform rendering accuracy.

Why use a unified checker? Checking three separate platform tools means three logins, three tabs, and three separate workflows. When you're pre-checking 10 URLs before a campaign, that's a significant time cost. share-preview.com consolidates everything into one URL paste and shows you all platforms simultaneously.

Pre-Publish Link Preview Checklist

Run through this 5-step checklist before sharing any important URL:

✅ Pre-Publish Link Preview Checklist

0 of 5 steps complete

Common Link Preview Problems and Fixes

Problem: Preview shows wrong image (or no image)

Fix: Check that your og:image uses an absolute URL (starting with https://), not a relative path. The Facebook bot won't follow relative paths. Also confirm the image isn't blocked by a robots.txt disallow rule or a login wall.

Problem: Preview shows old content after an update

Fix: Platform cache. Run the Facebook Sharing Debugger and LinkedIn Post Inspector to force re-scrape. For Twitter, add a query string version parameter to your image URL to bust the image cache.

Problem: LinkedIn shows a tiny square image instead of large card

Fix: LinkedIn shows the large card format only when the image is at least 1200×627px. If your image is smaller, it defaults to the small square thumbnail. Resize your OG image.

Problem: Title is the site name, not the page title

Fix: Your page is missing the og:title tag entirely. Without it, platforms fall back to the HTML <title> tag — and sometimes the site name field from older cached data. Add explicit og:title to every page.

Problem: Description is cut off or shows lorem ipsum

Fix: Truncation means your og:description is too long (aim for under 150 characters). Lorem ipsum means a CMS template wasn't filled in properly — check your page's actual meta description field in the CMS.

Check your link previews right now

Paste any URL into share-preview.com and see exactly how it will look on Facebook, Twitter/X, and LinkedIn — before you share.

Check Your Link →

The Bottom Line

A broken link preview is a silent conversion killer. Your audience sees a blank image or a truncated title in their feed and scrolls past — never knowing what they missed. A great preview — clean image, sharp title, compelling description — is the difference between a link that gets clicked and one that gets ignored.

Link preview checkers take 60 seconds to use and save you from hours of "why isn't my preview working?" debugging after the fact. Make it a habit to run every important URL through share-preview.com before you share — and use the pre-publish checklist above to make sure every element is right before your campaign goes live.