Free Trial
10 days, no credit_card

<< More Tutorials

How to make an image responsive in Ruby using rethumb?

The following code prints HTML with responsive images support. It's ready to use and defines three levels of resolution: 400px, 800px and original image.

Adapt and start using the following code in Ruby (we use Picturefill as polyfill):

image_url = "";

small_width = 400; # Image width for small resolutions (less than 400px). 
large_width = 800; # Image width for medium resolutions (less than 800px).
image_width = 999; # Image original width (used for resolutions larger than 800px).

puts %Q{

<script src=""></script>

<img src="{small_width}/#{image_url}"

     srcset="{small_width}/#{image_url} #{small_width}w,
   {large_width}/#{image_url} #{large_width}w,
             #{image_url} #{image_width}w"

     sizes="100vw" />


Start using this example now

Use the following commands to get started:

$ git clone
$ cd rethumb-ruby-examples
$ ruby responsive-images.rb

More examples using Ruby