Shell script to batch convert HEIC files to jpeg, leaving the original and its converted side by side. Requires Mac OS or Linux, the find command line tool, and ImageMagick

batch-convert-heic.rb

#!/usr/bin/env ruby

require 'shellwords'

files = `find . -iname '*.heic'`.split("\n")
files.each do |original_file|
  output_file = original_file.gsub(/\.heic\z/i, ' Converted.jpg')
  if File.exist?(output_file)
    STDERR.puts "Skipping output #{output_file} exists."
  else
    cmd = "convert #{Shellwords.escape(original_file)} #{Shellwords.escape(output_file)}"
    puts cmd
    system cmd
  end
end