It shows how we can convert base64 text to an image file.

base64_to_image_file.rb

module Base64ToImageFile
  extend ActiveSupport::Concern

  def convert_base64_to_image_file(base64_data, filename = 'image')
    return base64_data unless base64_data.present? && base64_data.is_a?(String)

    regex = /data:image\/([a-z]{3,4});base64,/
    type_fetch_regex = /\/(.*?);/
    start_text = regex.match(base64_data)
    type = base64_data[type_fetch_regex, 1]
    if start_text && type
      file = File.new("#{filename}.#{type}", 'wb')
      file.write(Base64.decode64(base64_data[start_text.to_s.length..-1]))
      file # returns crated file.
    else
      # base64_data => if you want to return the passing value
      nil
    end
  end
end