OG Image Preview
See your link card before you post it, and why it looks wrong.
Free, no signup, no limits
Why your link preview looks wrong
A link preview breaks for one of five reasons, and the tool above names which one applies to your page. Most often it is the image: missing, relative, too small, the wrong shape, or simply still cached from last week.
Other tools in this category render a mock card and leave you to guess. This one measures your actual image, weighs your actual file, and names the rule.
The things that go wrong, roughly in order of how often:
| Symptom | Cause |
|---|---|
| No image at all | og:image missing, or written as a relative path |
| Small thumbnail instead of a wide card | Image under 600px wide, or twitter:card not set to summary_large_image |
| Headline cut off | Image is square or portrait and gets cropped to 1.91:1 |
| Blurry on a good screen | Image under 1200px wide, then upscaled |
| Nothing changes after you fix it | The platform cached the old version |
What size should an OG image be?
1200 by 630 pixels, a ratio of about 1.91 to 1. One image, every platform. The minimum before the layout degrades is 600 pixels wide, and past 1 MB you are in the range where slow crawls start timing out.
Keep the important part in the middle. Different platforms trim different amounts from the edges, so a headline that sits near the top will survive on one and not another.
Why crawlers cannot see meta tags added by JavaScript
This is the difference that catches out modern sites. If your meta tags are injected on the client, by a framework or a tag manager, a browser sees them and a crawler does not. LinkedIn, Facebook, Slack and X all read the HTML your server sent and stop there.
This tool does the same thing on purpose. It requests your page, reads the raw response, and runs no JavaScript. If a tag does not appear here, it does not exist as far as a link preview is concerned.
Why your OG image is not updating
Assume the cache before you assume your markup. LinkedIn and Facebook hold a copy of your page for days, and re-sharing the link will keep showing the old card no matter how many times you fix the tags.
While you are checking what crawlers see, the favicon checker covers the other half of how your link looks in a feed.
Both platforms have a tool that forces a re-read, and this one hands you both with your URL already filled in. Run them once, wait a few minutes, and share again.
Frequently asked questions
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Something missing here?
If this tool almost does what you need, say what is missing. That is usually how the next version gets built.