You finish a blog post, paste the link into LinkedIn, and the preview card shows last month’s title and a blank grey box where the image should be. Nothing is wrong with your page. LinkedIn is showing an old copy it saved earlier.
LinkedIn Post Inspector is the free tool built for this problem. This guide covers what it does, how to use it, and how to fix the errors it flags.
What is LinkedIn Post Inspector?
Post Inspector is LinkedIn’s own debugging tool for link previews. You give it a URL, and it shows the title, description and image LinkedIn will display when someone shares that page. It also shows the raw data behind the card, so you can see where a mistake is coming from.
Two points are easy to miss. The tool is for external links, such as blog posts, landing pages and product pages. It also cannot repair your website. It shows you what LinkedIn sees and refreshes LinkedIn’s stored copy. If your page has bad data, you still have to fix the page.
Why link previews go wrong
LinkedIn builds a preview by sending its crawler, called LinkedInBot, to your URL. The crawler reads a set of HTML tags in your page’s head section known as Open Graph tags. The four that matter most are:
- og:title is the headline on the card.
- og:description is the short summary under the headline.
- og:image is the thumbnail.
- og:url is the canonical address of the page.
Adding og:type (usually “article” for blog posts) is a good habit too.
The first time anyone shares your URL, LinkedIn reads these tags and stores the result. Later shares reuse that stored version. If you change your title or swap your featured image afterwards, LinkedIn keeps showing the old data. Most guides put the cache lifetime at around seven days. LinkedIn’s own help pages weren’t readable for me, so treat that figure as a rough estimate rather than an official number.
That’s the reason so many people end up with the wrong preview even though their site looks fine.
How to use LinkedIn Post Inspector
The process takes about a minute.
- Open linkedin.com/post-inspector. Sign in to LinkedIn if it asks you to.
- Paste the full URL, including the https:// part.
- Click Inspect.
- Read the result. Check the title, description and image, then open the details section to see which tags LinkedIn actually found.
If the preview is wrong, fix the tags on your page first. Then run the URL through the inspector again. That second run clears the old stored data and pulls in the new version. There is no separate “clear cache” button. Inspecting the URL does the refreshing.
If you change your tags often, make it a habit. Publish, inspect, then share.
Common problems and how to fix them
The preview shows an old title or image
This is almost always the cache. Re-inspect the URL and the newer version should replace it. If it still looks stale, share the link with a harmless query string added, like ?v=2. LinkedIn treats that as a separate URL and reads it from scratch.
One catch is that posts you’ve already published keep their original preview. The inspector only affects future shares. To fix an existing post, you would have to delete it and post the link again.
The image is missing, blurry or cropped
Image size is the usual cause. Aim for at least 1200 x 627 pixels, which is close to a 1.91:1 ratio. Smaller images tend to render poorly or get cropped strangely. Also confirm the og:image address is a full URL that loads on its own, and that the file is a standard JPG or PNG. Very large files can cause problems as well, so keep them lean.
The title or description is wrong
Look at the details section and see which tags LinkedIn found. A common culprit is duplicate tags. If your SEO plugin and your theme both output Open Graph data, LinkedIn may pick the wrong one. WordPress users see this a lot. Turn off one source so only one set of tags remains.
The tags exist, but LinkedIn can’t see them
Open Graph tags need to be in the HTML your server sends, before any JavaScript runs. If your site adds them afterwards in the browser, the crawler will miss them. To check, use “view source” on your page, not the browser’s inspect tool, and search for og:title. If it’s missing there, LinkedIn can’t read it either.
The inspector shows an error or won’t connect
If the tool can’t reach your page, the crawler is probably being blocked. Check these things:
- A firewall, security plugin or CDN may be filtering LinkedInBot.
- Your server may be slow or timing out.
- The page may not return a normal 200 status.
- Your SSL certificate may be misconfigured.
Allow LinkedIn’s crawler through, make sure the page loads quickly over HTTPS, and try again. If you see a bandwidth or rate-limit message, wait 15 to 30 minutes rather than hammering the button. Spacing out your checks helps if you’re testing many URLs.
A quick Open Graph checklist
Before you share an important page, run through this:
- Title is clear and short enough not to get cut off.
- Description is written for humans and summarizes the page.
- Image is at least 1200 x 627 pixels and loads at its own URL.
- Only one set of Open Graph tags exists on the page.
- The tags appear in the page source.
- Your firewall or CDN isn’t blocking LinkedIn’s crawler.
Does a good preview improve performance?
A clean preview won’t make a weak post go viral. It does remove one avoidable reason for people to scroll past. A card with a sharp image and a clear headline looks more trustworthy than a bare URL or a mismatched title.
The rest still comes down to the post itself. Put a strong hook in the first two lines, add some context around the link instead of dropping it alone, and reply to comments early. LinkedIn looks at how people respond in the first hour or so, and a comment counts for more than a like.
Limits to know about
- It works only for public external URLs, not posts written in LinkedIn’s own article editor.
- It won’t update posts that are already live.
- It won’t fix missing or broken tags on your site.
- It only refreshes LinkedIn’s cache. Facebook, X and other platforms have their own debuggers.
FAQs
Is LinkedIn Post Inspector free?
Yes. It costs nothing and has no paid tier.
How long does LinkedIn cache a link preview?
Roughly seven days, according to most guides, though LinkedIn doesn’t publish an exact figure.
Why is my updated image not showing?
Either the cache still holds the old version, or the new image is too small, blocked or in the wrong place. Re-inspect the URL and check the image details.
Can I fix a preview on a post I’ve already published?
No. Delete the post and share the link again after refreshing it.
What does the “internal connector error” mean?
LinkedIn’s crawler couldn’t connect to your server. Check your firewall, CDN, SSL and page speed.
Final thoughts
Checking a link takes less time than writing the caption around it. Inspect the URL, fix whatever the details panel points to, and inspect again. Do that before you share anything important, and you’ll stop losing clicks to a broken preview.