Facebook Link Preview Checker
Facebook builds the share card from Open Graph tags. Check the image, title, and URL here. When the live share is stale, Facebook's Sharing Debugger is the official way to scrape it again.
What the facebook link preview checker checks
- Tags Facebook uses. Set og:url to the undecorated canonical URL — likes and shares for that page add up there. Set og:title, og:description, and og:image. og:type defaults to website when you leave it out; set article (or another type) when that is what the page is. Add og:image:width and og:image:height so the image can render on the first share, before Facebook has finished downloading it.
- Image rules. The smallest image Facebook accepts is 200×200. Use at least 600×315 for the larger link post, and at least 1200×630 for high-resolution screens. Stay close to 1.91:1 or Feed crops the image. The file must not exceed 8 MB. Facebook's webmaster guide lists image/jpeg, image/gif, and image/png for og:image:type.
- Cache and the Sharing Debugger. Facebook caches the scrape, and it caches each image by its URL. A replaced image needs a new URL, and old shares do not update on their own. The official refresh tool is the Sharing Debugger on Meta's developer site: paste the URL, read the tags and errors it scraped, and the scrape updates what Facebook has stored. This checker shows the tags your server sends. It does not clear Facebook's cache.
Tags covered: og:url · og:type · og:title · og:description · og:image · og:image:width · og:image:height
More checkers
Twitter Card ValidatorOpen Graph CheckerLinkedIn Link Preview CheckerDiscord Embed PreviewWhatsApp Link Preview CheckerSlack Link Preview CheckeriMessage Link Preview CheckerOpen Graph Image SizeAll platforms
What each platform reads
- X / Twittertwitter:card, twitter:* → og:* fallback1200×630 (min 300×157), < 5 MB
- Facebookog:title, og:description, og:image1200×630, 1.91:1
- LinkedInog:title, og:image (og: only)1200×627, 1.91:1
- Discordog:site_name, og:*, theme-color, twitter:cardLarge image needs summary_large_image
- Slackog:site_name, og:title, og:description, og:image1200×630
- WhatsAppog:title, og:description, og:imageKeep < 300 KB
Guidance based on each platform's public documentation and observed behavior. Platforms change their rules without notice.
FAQ
+Is Peekly free?
Yes. Checking a single URL is free forever — no signup and no limit on one-off checks. Batch watching and monitoring may arrive later as a paid Pro plan; the free single-URL tool stays.
+Why does my link show no image when I share it?
Usually one of four things: there's no og:image tag, the image URL is relative instead of absolute, the image is behind a login, firewall or bot block, or the file is too big or in an unsupported format like SVG. Peekly checks all four and tells you which one it is.
+What size should my og:image be?
1200×630 pixels (a 1.91:1 ratio) as a PNG or JPG under about 300 KB. That size works for large cards on X, Facebook, LinkedIn, Discord, Slack and WhatsApp.
+Do I need twitter: tags if I already have Open Graph tags?
X reads og:title, og:description and og:image as fallbacks, but you still need twitter:card set to summary_large_image if you want the big image card. Without it, X shows a small thumbnail.
+I fixed my tags but the old preview still shows. Why?
Platforms cache link previews, sometimes for days. Facebook and LinkedIn let you force a refresh with their own debugging tools. On X, Slack and Discord the cache usually expires on its own, or you can add a query string such as ?v=2 to the URL.
+Do you store the pages I check?
No. We fetch the page once to read its <head>, show you the result, and don't save the page or the result. We only fetch public http(s) URLs, and private or internal addresses are blocked.
+Are the previews pixel-perfect?
They're close approximations of each platform's current card layout, built from the same tags the platforms read. Platforms change their designs from time to time, so treat them as a very good guide rather than a screenshot.
$9
One time
A written fix for the batch.
Up to 25 URLs. We check og:image, Twitter cards, size, redirects, and cache, then send copy-paste meta tags within 48 hours. The free single-URL check stays free.