Filters the thumbnail image size for use in the embed template.
Parameters
$image_sizestring- Thumbnail image size.
$thumbnail_idint- Attachment ID.
Source
$image_size = apply_filters( 'embed_thumbnail_image_size', $image_size, $thumbnail_id );
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HTTP/2 301
server: nginx
date: Fri, 10 Oct 2025 21:21:50 GMT
content-type: text/html; charset=UTF-8
x-olaf: ⛄
vary: accept, content-type
x-redirect-by: WordPress
location: https://developer.wordpress.org/reference/hooks/embed_thumbnail_image_size/
x-frame-options: SAMEORIGIN
alt-svc: h3=":443"; ma=86400
x-nc: MISS ord 1
HTTP/2 200
server: nginx
date: Fri, 10 Oct 2025 21:21:51 GMT
content-type: text/html; charset=UTF-8
vary: Accept-Encoding
x-olaf: ⛄
vary: accept, content-type
link: ; rel="alternate"; title="JSON"; type="application/json"
link: ; rel=shortlink
x-frame-options: SAMEORIGIN
content-encoding: gzip
alt-svc: h3=":443"; ma=86400
x-nc: MISS ord 1
embed_thumbnail_image_size – Hook | Developer.WordPress.org
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