file_to_data_uri

A Ruby gem that converts files or file-like objects to data URI strings (e.g. image files to strings suitable for use as the src of an <img>).

Add this line to your application's Gemfile:

gem "file_to_data_uri", "< 1.0.0"

And then, at a command prompt:

bundle install

Or, install it directly with:

gem install file_to_data_uri

# With a file path
@data_uri = DataURI.convert("path/to/image.jpg") # => "data:image/jpeg;base64,..."

# With a file-like object, e.g. an uploaded file
@data_uri = DataURI.convert(params[:image]) # => "data:image/png;base64,..."

# Then you can use it in an ERB template
# <img src="<%= @data_uri %>">

• File paths: Pass a string with a path to a local file.
• File-like objects: Pass an object that responds to read (like File.open("image.jpg") or a Rails uploaded file).

This gem is available as open source under the terms of the MIT License.