Plugin-tag: resize image
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WP Imsizer
Auto resize/convert image uploads to set height/width or file type. Auto set image alt, title tags, limit file size and disable 2560px limit.
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TR Timthumb
Allows you to use Timthumb easy and regenerate your thumbnails after changing the thumbnail sizes.
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Real Time Responsive Images Plugin for WordPress by TwicPics
Boost your website performance and SEO by delivering pixel perfect images on the fly to any devices.