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This plugin optimizes and resizes all images in your content using the service. Sign up for a free 30 day trial at (

Attention: has been discontinued and this plugin is no longer maintained. See The future of responsive-io. is a service that optimizes and delivers perfect images for every screen.

We automatically pull images from your website, resize and optimize them for your visitors to speed up load time.

The plugin will make sure your tags are ready and that our javascript is loaded. All that unobtrusively without changing the content in your database.


  • Images are automatically resized to fit any device.
  • Our global CDN delivers your images in milliseconds.
  • Retina support. High quality images for high density screens.
  • We use WebP, progressive JPG and clever optimizations to make your images smaller.
  • Our servers cache your images so they are ready to be served in all sizes.
  • No watermarks, no user-agent sniffing, no cookies, no extra HTTP requests. No bullshit.

Register your domain for a free trial at

Author 14islands
Contributors 14islands
Tags images, responsive, responsive images, responsive web design, rwd

Using The WordPress Dashboard

  1. Navigate to the 'Add New' in the plugins dashboard
  2. Search for 'responsive-io'
  3. Click 'Install Now'
  4. Activate the plugin on the Plugin dashboard

Uploading in WordPress Dashboard

  1. Navigate to the 'Add New' in the plugins dashboard
  2. Navigate to the 'Upload' area
  3. Select from your computer
  4. Click 'Install Now'
  5. Activate the plugin in the Plugin dashboard

Using FTP

  1. Download
  2. Extract the responsive-io directory to your computer
  3. Upload the responsive-io directory to the /wp-content/plugins/ directory
  4. Activate the plugin in the Plugin dashboard


  • Bug fix: Skipping GIFs as the service does not support that yet.


  • Bug fix: Using SmartDomDocument to avoid encoding issues.


  • Bug fix: removing acf filter to avoid charset conflicts.


  • Adding fallback script check. The fallback script will added to the queue and load in case the CDN fails.


  • Bug fix version. Making sure the scripts loads at the footer.


  • Bug fix version. Lower the priority to further avoid other filters conflicts.


  • Initial version. Changes images and check for [caption] to avoid conflicts.

How does it work?

It relies on Wordpress "the_content" filter to change the images before handing over the output to the browser.


This plugin supports the GitHub Updater plugin, so if you install that, this plugin becomes automatically updateable direct from GitHub. Any submission to repo will make this redundant.

Version 1.1.9

Requires WordPress version: 3.5.1 or higher

Compatible up to: 4.3.8

Last Updated 31 Jan 2017

Date Added: 11 Mar 2014

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