Delete the original big size image after upload and leave only 3 images crunched by media gallery

The question:

I need to know is it possible to somehow erase the original image uploaded via Gravity form : post image – post field?! With the situation now I receive 4 images. 1 original (can be whatever user has on his PC – up to 4 MB which clutters the server) and 3 which WordPress creates according to specifications (thumbnail, medium, large). I would like to have the ability when user uploads the “original big image” to be deleted upon upload and be left with 3 remaining in media gallery?!. It will dramatically improve the storage on my server.


The Solutions:

Below are the methods you can try. The first solution is probably the best. Try others if the first one doesn’t work. Senior developers aren’t just copying/pasting – they read the methods carefully & apply them wisely to each case.

Method 1

How about this:

add_filter( 'wp_generate_attachment_metadata', 'delete_fullsize_image' );
function delete_fullsize_image( $metadata )
    $upload_dir = wp_upload_dir();
    $full_image_path = trailingslashit( $upload_dir['basedir'] ) . $metadata['file'];
    $deleted = unlink( $full_image_path );

    return $metadata;

Not 100% sure everything will work ok without the main image, but it does the trick. You wont be able to regenerate the thumbnails / sizes as the main image is required for this.

Edit: I just re-read the question, I noticed you are wanting this to only happen when people upload via a form. Must be early for me, the above code will delete any attachment uploaded. I guess all you would need to do is find someway of checking if the upload was via your gravity form. Hope it helps you anyway.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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