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I have already read https://stackoverflow.com/questions/41524931/how-to-set-featured-image-programmatically-from-url and that's not the answer to my question.

The above answer will download the image from the source and upload the library. I just want to set external URL(image URL) as the featured image without downloading my own server.

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You can use the post_thumbnail_html filter to set the post thumbnail programmatically to an external URL.

Then you wold set the image URL in a Custom Field on the post writing screen metabox (in this example with a meta key of thumbnail_url):

add_filter('post_thumbnail_html', 'custom_thumbnail_tag_filter', 10, 3);
function custom_thumbnail_tag_filter($html, $postid, $thumbnailid) {
    if (!$thumbnailid) {
        $src = get_post_meta($postid, 'thumbnail_url', true);
        if ($src) {$html = "<img src='" . $src . "'>";}
    }
    return $html;
}
  • Thanks, I didn't test, but this is exactly what I need. I will accept after testing it. – I am the Most Stupid Person Jul 4 at 10:37
  • It should be fine so long as the theme / template uses standard thumbnail functions (some theme's write and use their own.) – majick Jul 4 at 10:40

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