This plugin allows you to optimize new and existing WordPress image uploads through Kraken Image Optimizer's API. Both lossless and intelligent lossy optimization modes are supported. Supported filetypes are JPEG, PNG and GIF. Maximum filesize limit is 16 MB. For more details, including detailed documentation and plans and pricing, please visit Kraken.io.

Optimizing your images not only helps your WordPress site load faster, but can also boost your SEO. In Why Trying to Get 95+ on Google PageSpeed Insights for Your WordPress Site Will Drive You Mad! earlier this month, I looked at measures for improving page speed.

This plugins allows you to rename physically the media files by updating their titles. It also updates theirs links in the posts automatically.

The PB Responsive Images plugin automatically reformats all images in the post content into a format similar to the picture tag proposed by the Responsive Images Community Group on w3.org. The default configuration provides the necessary image sizes for the Twenty Eleven theme for reference; you'll have to customize the configuration to fit your theme best.

Introduction Hammy takes your regular content images (only within posts and pages, not custom post types) and regenerates a number of smaller sized images. When a person visits your website, it then automatically provides them with the most appropriate image (or the smallest one possible). This makes for a better experience, especially on mobile.

Imsanity automatically resizes huge image uploads down to a size that is more reasonable for display in browser, yet still more than large enough for typical website use. The plugin is configurable with a max width, height and quality.

The CW Image Optimizer is a WordPress plugin that will automatically and losslessly optimize your images as you upload them to your blog. It can also optimize the images that you have already uploaded in the past. Because CW Image Optimizer uses lossless optimization techniques, your image quality will be exactly the same before and after the optimization.

The EWWW Image Optimizer is a WordPress plugin that will automatically optimize your images as you upload them to your blog. It can optimize the images that you have already uploaded, convert your images automatically to the file format that will produce the smallest image size (make sure you read the WARNINGS), and optionally apply lossy reductions for PNG and JPG images.

Smush.it uses optimization techniques specific to image format to remove unnecessary bytes from image files. It is a "lossless" tool, which means it optimizes the images without changing their look or visual quality. After Smush.it runs on a web page it reports how many bytes would be saved by optimizing the page's images and provides a downloadable zip file with the minimized image files.

SEO Friendly Images automatically adds alt and title attributes to all your images improving traffic from search engines.

Speed up your website by reducing the size of your images without losing quality. Test Imagify for free right now!