Open Graph Checker and Social Share Preview
Enter a URL to see its link preview on five platforms, with every Open Graph and Twitter Card tag checked.
When someone pastes your link into Facebook, LinkedIn, X, WhatsApp or Slack, the app fetches your page and builds a card from its Open Graph and Twitter Card tags. Get them right and the link shows a sharp image, a clear title and a reason to click. Get them wrong and it shows a cropped logo, cookie-banner text or nothing at all.
This Open Graph checker reads those tags, previews the card on each platform and validates the og:image size, so you can fix shares before they happen instead of after a post goes out with a broken preview.
How to test your link previews
Enter the URL you will share
Use the exact address, including any language or campaign path, because each URL has its own tags.
Review each preview
See the Facebook, X, LinkedIn, WhatsApp and Slack cards, plus a list of every tag found.
Fix tags and refresh caches
Update the tags, then ask each platform to re-read the URL so it drops the old preview.
The tags every shareable page needs
The Open Graph protocol defines four basic properties — og:title, og:type, og:image and og:url — and most platforms also read og:description and og:site_name. X reads its own twitter: tags first and falls back to the Open Graph values when they are missing.
<meta property="og:type" content="article">
<meta property="og:title" content="How to Test robots.txt Rules">
<meta property="og:description" content="A step-by-step guide with examples.">
<meta property="og:url" content="https://example.com/robots-txt-guide">
<meta property="og:image" content="https://example.com/img/robots-guide-1200x630.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="Diagram of a robots.txt rule matching a URL">
<meta property="og:site_name" content="Example">
<meta name="twitter:card" content="summary_large_image">Most broken previews trace back to three errors: a relative og:image path, two sets of tags written by a theme and a plugin (platforms may pick the wrong image), and an og:url that points to the home page on every page. Facebook treats og:url as the canonical address, so that last mistake makes every share show your home page card.
Open Graph tags use property=, while Twitter Card tags use name=. Background: Open Graph and Twitter Card.
Getting og:image right
- Size. 1200 × 630 px (about 1.91:1) is the safe default. Facebook’s sharing documentation recommends at least that size for high-resolution displays, 600 × 315 px as the minimum for large previews, and files no bigger than 8 MB.
- Absolute URL.
https://example.com/img/card.png, never/img/card.png. - Safe zone. Keep text and faces near the center; some apps crop to a square or a wider frame.
- Format and weight. JPEG and PNG are the most widely supported. Keep the file light, well under a megabyte where possible; messaging apps are the least forgiving.
- Reachable. The image must return 200 to bots, with no login, hotlink protection or firewall challenge in the way.
Facebook advises declaring og:image:width and og:image:height so the image displays properly the first time the link is shared. It also caches images by URL, so when you change the picture, give the file a new name.
Why your old preview won’t go away
Platforms cache link previews. After you fix the tags, the old card can stick around until you force a refresh:
- Facebook: paste the URL into the Sharing Debugger and choose “Scrape Again”.
- LinkedIn: inspect the URL in the Post Inspector, which also refreshes its cache.
- X, WhatsApp and Slack: there is no public refresh button; adding a harmless query string such as
?v=2usually makes the app treat the link as new.
If the preview is blank everywhere, check that bots can reach the page at all: robots.txt rules, a firewall or a cookie wall can block social crawlers just as they block search bots. The robots.txt tester and the meta tags checker help track down the cause.
Tips for better social previews
- Design one 1200 × 630 template for your site and generate a card per page; consistent cards make your shares recognizable.
- Write og:title for the feed, not for Google — it can be shorter and punchier than the title tag.
- Set og:url to the canonical URL so shares of different URL variants are counted together.
- Add og:image:alt to describe the image for people using screen readers.
- Check previews before every launch or campaign, not after the first share.
Limits to keep in mind
The previews closely approximate each platform’s current card layout, but apps change their designs and cropping without notice, and a cached card may still appear for a while after you fix the tags. We read the server HTML without running JavaScript, as most social crawlers do, so tags added by scripts won’t count. To generate a complete tag set, use the meta tag generator.
Last updated Oct 30, 2026 by the Yes SEO team.
Open Graph Checker: frequently asked questions
What is an Open Graph checker?
It reads a page’s Open Graph and Twitter Card tags, shows how the link will look when shared on social networks and messaging apps, and flags missing tags and image problems. It also checks the og:image dimensions so the card can show a large, sharp image.
What size should an og:image be?
Use 1200 × 630 pixels, a ratio of about 1.91:1. Facebook recommends at least that size for sharp previews and allows files up to 8 MB, but lighter files are safer for messaging apps.
Why is my link preview showing the wrong image?
Usually the platform cached an old version, the og:image URL is relative or blocked, or several og:image tags compete. Fix the tags, then re-scrape the URL in Facebook’s Sharing Debugger or LinkedIn’s Post Inspector.
Do I need Twitter Card tags if I have Open Graph?
X falls back to Open Graph for the title, description and image, so the main tag you need is twitter:card to choose the large-image layout. Add other twitter: tags only if you want different text on X.
Do Open Graph tags help SEO?
They aren’t a Google ranking factor. They do control how your links look when shared, which affects clicks and traffic from social and messaging apps.