See how your link looks on Bluesky
Paste a URL to preview an approximation of the Bluesky card.
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What Bluesky documents
Link card
Bluesky’s protocol definition describes a link card (app.bsky.embed.external) as a uri, a title, a description and an optional thumb image.
Thumb size
The thumb is a blob that accepts image/* with a maxSize of 1,000,000 bytes, which is 1 MB.
Who builds it
The posting app builds the card and stores it in the post. The definition does not say which page tags the app reads.
Frequently asked questions
They are built by the posting app and stored in the post. Bluesky’s protocol definition lists the fields, but not which page tags are used to fill them.
The card’s thumb has a maxSize of 1,000,000 bytes. Bluesky’s definition is a protocol file rather than a help page, and it does not document image dimensions or aspect ratio.