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How can I insert pictures into a post without any hard coded dimensions (e.g. <img src="" alt="" /> instead of <img src="" alt="" width="" height="" />)? I don't want my users to switch to the HTML tab and remove the parameters by themselves, so I was wondering if there is any filter I can use to achieve this?

Note: I'm already inserting them in "Full size".

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I don't know if this is the best way to do this, but it works for me.

In the functions.php of the theme you are using, put this:

function remove_img_src($html)
    $html = preg_replace('@(width|height)="([0-9])+" ?@i', '', $html);

    return $html;

add_filter('image_send_to_editor', 'remove_img_src', 10, 8);

It uses regular expresions to change the output that is inserted in the editor.

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It doesn't seem to work when pulling the images from the post gallery, using wp_get_attachment_image. Any suggestions? – João Apr 4 '12 at 20:14
For what i see on the code, it seems that it can't be done without hardcode the changes. There's a filter in line 663, but on line 665 is harcoded the $hwstring wich contains that width/height definition. – oso96_2000 Apr 4 '12 at 21:46
Any more ideas on how to solve this? – João Apr 5 '12 at 15:39

Looks like you can do it with image captions, but not images at present:

From the wp-hackers mailing list:

I've got a filter I use that forces captions to be responsive on the frontend. Definitely cuts down on the headaches.

Gist here: https://gist.github.com/2243601


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Thanks! In the meantime I've used wp_get_attachment_image_src() to get the src for the images. I think it ends up by being the most easy solution and it requires no filters. – João Apr 6 '12 at 11:29
up vote 1 down vote accepted

I found a solution in the meantime: wp_get_attachment_image_src() to get the src for the images. I think it ends up by being the easiest solution and it requires no filters.

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