One of my favorite zsh functions allows me to effortlessly upload .HEIC photos from my iPhone to macOS and automatically convert them to .jpg format. Furthermore, I can then utilize mozjpeg to compress the images, optimizing their size without compromising quality. MIT License.

heic.zsh

function heic () {
  for f in *.HEIC
  do
    [[ -e $f ]] || { echo "Error: File $f does not exist"; continue; }
    output_file=${f:t:r}.jpg
    /opt/homebrew/bin/convert -format jpg "$f" "$output_file" && \
      /opt/homebrew/bin/trash "$f" || \
      echo "Error: Conversion with convert failed for $f"
    original_size=$(du -h "$output_file" | cut -f1)
    tmp_file=$(mktemp /tmp/moz.XXXXXX.jpg)
    /opt/homebrew/opt/mozjpeg/bin/cjpeg -quality 75 -progressive -outfile "$tmp_file" "$output_file" && \
      mv "$tmp_file" "$output_file" || \
      echo "Error: Compression with cjpeg failed for $output_file"
    final_size=$(du -h "$output_file" | cut -f1)
    echo "$output_file   $original_size   $final_size"
  done
}


# IMG_5832.jpg   3.6M   1.4M
# IMG_5833.jpg   1.6M   576K
# IMG_5834.jpg   2.0M   720K