Free WordPress WP Retina 2x pluginFree
This plugin does two things: it creates the image files required by the High-DPI devices and it displays them to your visitors accordingly. Your website will look beautiful and crisp on every device! The retina images will be generated for you automatically (though you can also do it manually) and served to the retina devices. The concept of retina images for full-size images is also a very unique feature which is only provided by this plugin (which is why it became unique).
Retina Methods. It supports different methods to serve the images to your visitors. Why? Depending on the theme and plugins you are using (and also the way you use images in your website), not all the methods can work. Ideally, I would recommend using the Responsive Images method, then if it doesn’t work, the PictureFill method (which covers normally most cases). Retina.js should be the fallback method. There are more methods than this with their specific options.
Plug & Play. With a well-made theme and website, this plugin doesn’t require normally any specific set-up. All the defaults settings are fine. Works with multi-site and many kinds of installs.
Optimized. The plugin is very fast and optimized. It doesn’t create anything in the database.
Pro. When activated, the Pro version adds support for Retina for full-size, support for lazy-loading for your responsive images and various options. And it supports my work
Author: Jordy Meow
Source from: WordPress.org