PHP

wordpress get post thumbnail url

<?php 
  // ALL parameters are optional. Not needed if you are on WP LOOP
  echo get_the_post_thumbnail_url( $the_query->ID, array( 500, 400) ); ?>

wordpress thumbnail url

<img src='<?php the_post_thumbnail_url(); ?>'>

Wordpress thumbnail

// without parameter -> Post Thumbnail (as set by theme using set_post_thumbnail_size())
get_the_post_thumbnail( $post_id );                   
 
get_the_post_thumbnail( $post_id, 'thumbnail' );      // Thumbnail (Note: different to Post Thumbnail)
get_the_post_thumbnail( $post_id, 'medium' );         // Medium resolution
get_the_post_thumbnail( $post_id, 'large' );          // Large resolution
get_the_post_thumbnail( $post_id, 'full' );           // Original resolution
 
get_the_post_thumbnail( $post_id, array( 100, 100) ); // Other resolutions