How will your page look in Google, Facebook, LinkedIn and X?

Google publishes no fixed length. Its guidance says a title or snippet is shortened "typically to fit the device width". Common rules of thumb are about 600 pixels for a title (around 50 to 60 characters) and about 920 pixels for a description on desktop (around 155 characters), with less shown on phones. This tool uses those figures to estimate the cut-off, and says so. Put the words that matter first.

Google generates title links and snippets automatically. It may build a title from your headings, other prominent text or the og:title when your title is empty, repeated across pages, out of date or does not match the page, and it uses your meta description only when it thinks the description describes the page better than the page text. It can also show different snippets for different searches, and Google says it cannot change them by hand for a site.

Open Graph tags (og:title, og:description, og:image, og:url) are meta tags in the page head that Facebook, LinkedIn and many other apps read to build the card for a shared link. Without og:image the link is shared as plain text. Use a full https address. Facebook recommends 1200 x 630 pixels, at least 600 x 315 for a large card and never below 200 x 200; LinkedIn recommends 1200 x 627.

X documents twitter:card as the one required property of a card, for example summary_large_image for a large picture (commonly cited as about a 2:1 image; check the current X documentation for the exact limits). Many sites add only that one line and let the Open Graph tags supply the rest. We could not confirm that fallback in X's current documentation, so the checker shows which tag each text came from and does not assume it.

Not by itself in most cases. The description and the social tags do not directly rank a page, and Google ignores the meta keywords tag completely. What the tags change is the result and the shared card people see, and so how many click. The exceptions are real: a noindex tag removes the page from search, and a wrong canonical can make Google choose another address.

Facebook, LinkedIn and X keep a copy of each link they have seen. After changing tags, ask each network to fetch the page again (their sharing debugger or post inspector). This checker reads the live page every time, except that the answer for the same address is remembered for five minutes.