WordPress image crop

wordpress code

add_theme_support( 'post-thumbnails');
WordPress crop an image = 5 size. Sizes are given below

thumbnail: Thumbnail (default 150px x 150px max)
medium: Medium resolution (default 300px x 300px max)
large: Large resolution (default 640px x 640px max)
full: Original image resolution (unmodified)

But, if you need custom size, you can define sizes in functions.php

add_image_size( 'post-image', 600, 200, true );

Using the sized image in your loop

Image URL

If you want to use wordpress resize just add your size, I’ve added large size image in example

$image_variable = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'large' ); echo $image_variable[0];

If you want to use your custom size

$image_variable = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'post-image' ); echo $image_variable[0];