Image cropper gives you an API for cropping images inside WordPress.

yaroinfo

Responsive cropped Yummy images, pictures and thumbnails

Manual cropping of images for different sizes

julioprotzek

For cropping a post thumbnail image to 200×300 pixels:
<pre><code><?php
 the_post();
 img(200, 300);
?>
</code></pre>
This will verify the existence of post thumbnail, crop the image, save it in uploads folder, and generate an image tag.
To verify the existence of a post thumbnail, you can use <code>has_img()</code>
<pre><code><?php if (has_img()): ?>
<figure>
 <?php img(200, 300) ?>
 <figcaption>Some text</figcaption>
</figure>
<?php endif ?>
</code></pre>
To crop images that are not post thumbnails, you can use <code>crop($url, $size)</code>
<pre><code><?php
 $cropped_url= crop( get_bloginfo('url') . '/wp-content/uploads/image.jpg', array(200, 300) );
?>
<img src="<?php echo $cropped_url ?>">
</code></pre>

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