Create various image sizes ad hoc

You could, but I wouldn’t recommend doing it on the fly as it would take up unnecessary page resources each time the user loads the page. A better way to do it would put in the add_image_size hook you mentioned into the functions file, then install a plugin to regenerate thumbnails. https://wordpress.org/plugins/regenerate-thumbnails/ I’ve used this … Read more

Responsive WordPress Gallery

You need add some CSS to make it auto clear left after each 3th item and need to hide <br> tag Update your code like this- /* For displaying 3 columns on tablet */ @media only screen and (max-width: 800px) { .gallery-columns-5 .gallery-item { width: 33% !important; } .gallery-columns-5 br { display: none; } .gallery-columns-5 … Read more

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