Free tool
OG preview
Every time your link lands in Slack, iMessage, LinkedIn or a chat thread, a machine reads your Open Graph tags and draws a card. That card is your brand at the moment of recommendation. Enter a URL and this tool shows the exact og and twitter values crawlers receive: title, description and image, before any platform styling gets applied.
The card is the first impression you ship everywhere
Recommendations increasingly travel as pasted links: a founder drops your pricing page in a group chat, an assistant's answer includes your URL as a source, a colleague forwards a comparison to Slack. In every case the reader judges the card before deciding whether the page deserves a click. A sharp title, a concrete description and a legible image do quiet sales work thousands of times a month, while a missing image or a scraped fragment of navigation text does the opposite at the same scale.
The tags matter to machines beyond the card too. Open Graph values are a clean, structured statement of what the page is called and what it covers, and they frequently disagree with the title tag on neglected sites. Machines notice the disagreement; consistent metadata across the head is part of looking coherent to everything that reads you.
How to read your results
The essential four are og:title, og:description, og:image and twitter:card. Where og values exist, most platforms including X fall back to them, so the twitter namespace mainly needs twitter:card set to summary_large_image if you want the big rendering. Watch for three common failures: an image URL that is relative rather than absolute, which many scrapers refuse; an image smaller than 1200 by 630 pixels, which gets cropped or demoted to a thumbnail; and og values duplicated sitewide, which turns every share of every page into the same generic card.
Compare the values against the page's actual purpose. The og:title can differ from the title tag, shorter and punchier is fine, but it should describe this page rather than the company, because a share of your pricing page captioned with your homepage slogan wastes the impression.
What to fix first
Ship a valid absolute og:image at 1200 by 630 first, since the image is what makes a card noticeable at all. Then write per-page og:title and og:description in your template, pulled from the page's own metadata. Then set twitter:card once, sitewide. After a fix, remember platforms cache aggressively, so use their sharing debuggers to force a re-scrape. Cards shape what humans do with your links; whether AI assistants recommend the links at all is the layer above, and Reachroller tracks that from $29 per month with a free 3-day trial.
Frequently asked questions
What size should the og:image be?+
1200 by 630 pixels is the safe standard: large enough for every major platform's full-width card, at the 1.91 to 1 ratio most of them crop toward. Keep it under about 5 MB, serve it over https at an absolute URL, and put critical text near the center, since edges get trimmed at some ratios. One well-made template image per page type covers most sites.
Do I need Twitter tags if Open Graph is already set?+
Mostly one: twitter:card. X reads Open Graph values as fallbacks for title, description and image, so duplicating them into twitter tags adds maintenance without changing the render. Setting twitter:card to summary_large_image is worth the single line because the default rendering is the small thumbnail card, and the large format performs visibly better for content pages.
I updated my tags but shares still show the old card. Why?+
Platforms cache scraped metadata, often for days, so the card you see is the card they fetched before your fix. Each major platform offers a debugger that forces a fresh scrape: LinkedIn's Post Inspector and Facebook's Sharing Debugger are the usual ones. Run your URL through those after any change, and the new card takes over for subsequent shares.
Do AI assistants read Open Graph tags?+
When assistants and AI browsers render source links or previews, the card data comes from the same tags, and og values give every machine a clean summary of what the page is called and shows. Treat them as part of your machine-readable surface: they will never substitute for content quality, but inconsistent or absent tags make you look unmaintained to everything that fetches you.
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