zlabs

Picgrab is a plugin that download, resize and crop an image on the fly. 
Simply add the “resize” attribute in the img tag you want to grab & resize on your post.
E.g. 
<img src=”http://farm4.static.flickr.com/3532/3243887563_700849f242.jpg” resize=”402×200c;66y” /> 
Once activated, the plugin replaces the attribute “src” on img tags containing the “resize” attribute with something like:
http://yoursite/wp-content/plugins/picgrab/resize.php?url=<coded characters>&size=<coded characters> 
and removes the “resize” attribute.
The resize.php script included with plugin does the work to grab, crop and resize the image. 
It also manages the cache. 
The resize attribute format is:
[(x0,y0,xs,ys)]<xd>x|x<yd>|<xd>x<yd>[c[<crop>]][;<cachetime>]
e.g. 100x, x200, 100×50, 100×200c50, 100×200c
Refer to <a href="http://fabrizio.zellini.org/resize-e-crop-immagini-in-php" title="Crop / Resize script" rel="nofollow ugc">This post</a> for more informations on resizer syntax.
PicGrab require Php version >=8, gd and curl libraries.

Picture grabber, resizer and cropper

Picgrab is a plugin that download, resize and crop an image on the fly. It also stores resized and cropped images in local cache.

Tomasz Sita

Plugin allows you to manually crop all the image sizes registered in your WordPress theme (in particular featured image). 
Simply click on the “Crop” link next to any image in your media library. 
The WordPress Media Modal interface will be brought up and you are ready to go. 
Whole cropping process is really intuitive and simple.
Apart from media library list, the plugin adds links in few more places: 
* Below featured image box (“Crop featured image”) 
* In the media insert modal window (once you select an image)
<h4>Settings</h4>
The plugin includes a settings page where you can configure: 
* Image quality settings 
* Visibility of crop options 
* Custom labels for image sizes
<h4>GitHub Repository</h4>
https://github.com/tomaszsita/wp-manual-image-crop
<h4>Translations</h4>
<ul>
<li>Czech (AI Generated)</li>
<li>Dutch (Bernardo Hulsman)</li>
<li>French (Gabriel Féron)</li>
<li>German (Bertram Greenhough)</li>
<li>Hungarian (Roland Kal)</li>
<li>Italian (Alessandro Curci)</li>
<li>Japanese (AI Generated)</li>
<li>Korean (AI Generated)</li>
<li>Polish (myself)</li>
<li>Portuguese (Brazil) (AI Generated)</li>
<li>Russian (Andrey Hohlov)</li>
<li>Spanish (Andrew Kurtis)</li>
<li>Swedish (Karl Oskar Mattsson)</li>
<li>Turkish (AI Generated)</li>
</ul>
Please contact me if you want to add a translation (or submit a pull request on GitHub)

Manual Image Crop

Doesn't seem to work with add_image_size when used with a child theme's function.php using code like below:
/*---------------------------------------------*/
/* ADD CUSTOM IMAGE SIZES
/*---------------------------------------------*/

if ( function_exists( 'add_image_size' ) ) {
	add_image_size( 'facebook-image-page', 470, 470 );
}

add_filter( 'image_size_names_choose', 'insert_custom_image_sizes' );
function insert_custom_image_sizes( $sizes ) {
	global $_wp_additional_image_sizes;
	if ( empty($_wp_additional_image_sizes) )
		return $sizes;

	foreach ( $_wp_additional_image_sizes as $id => $data ) {
		if ( !isset($sizes[$id]) )
			$sizes[$id] = ucfirst( str_replace( '-', ' ', $id ) );
	}

	return $sizes;
}


Doesn't seem to work with

Support for this plug-in is very bad and it contains a few bugs. No response after a month..

Abandoned

Plugin allows you to manually crop all the image sizes registered in your WordPress theme (in particular featured image).

Picture grabber, resizer and cropper vs Manual Image Crop