Link preview:What does your link look like when someone shares it?

• Open Graph title

  Checks the headline shown when your link is shared on Facebook, LinkedIn, Slack or WhatsApp.

• Open Graph description

  Checks the short text under the headline of a shared link, so the card says what the page offers.

• Open Graph image

  Checks for a share image, so links posted on social apps show a picture instead of plain text.

• Open Graph image size

  Checks the share image is at least 1200×630 px, so previews are not blurry or cropped.

• Open Graph image reachable

  Checks social apps can actually download your share image from an absolute https address.

• og:url and canonical URL match

  Checks og:url matches the canonical URL, so share counts are not split between two addresses.

• Open Graph type

  Checks og:type says whether the page is a website, article or product, which shapes the card layout.

• Twitter card type

  Checks for a valid twitter:card type, without which X shows a shared link as plain text.

• Image for X (Twitter) cards

  Checks X has an image to show, from twitter:image or og:image, so the card is not text only.

• Facebook App ID

  Optional tag that links the page to a Facebook app so you can see share statistics.

• Link preview rendering

  Shows how your link looks on Facebook, LinkedIn, X and Slack before you share it.

How it works

1. 1

   Read the tags

   We read the Open Graph title, description, image, og:url, og:type, the Twitter card type and image, and the Facebook App ID.

2. 2

   Measure the image

   The share image is fetched and measured, not guessed from the tag, and compared with the recommended 1200×630 pixels.

3. 3

   Compare with the canonical

   og:url is compared with the page's canonical URL, so shares point to the address you want counted.

We read the tags as they are now. Facebook, LinkedIn and others cache previews, so an old card can show until you ask them to scrape again.