Convert a file or directory into webp files from jpg, jpeg, or png

.bash_profile

#
# Convert a file, or folder, into webp
# Example:
#     toWebp splash-01.png
#     toWebp splash-01.jpg
#     toWebp splash-01.jpeg
#     toWebp ./images
#     toWebp
#
toWebp() {
	input=${1:-.}

	# Check if input is a directory
	if [ -d "$input" ]; then
		for file in "$input"/*.{png,jpg,jpeg}; do
			filename="${file##*/}"

			# Make sure filename is not "*.jpeg" or "*.png"
			# Usually indicates no files found
			if [ "$filename" == "*.jpeg" ] || [ "$filename" == "*.png" ] || [ "$filename" == "*.jpg" ]; then
				continue
			fi

			# Check if converted webp already exists
			if [ -f "${filename%.*}.webp" ]; then
				echo "Skipping ${filename%.*}.webp"
				continue
			fi

			ffmpeg -i "$file" -c:v libwebp -q:v 90 "${file%.*}.webp"
		done

	# Input must be a file
	else
		filename="${input##*/}"
		ffmpeg -i "$input" -c:v libwebp -q:v 90 "${input%.*}.webp"
	fi
}

Instructions.md

Install this script into your ~/.bashrc or ~/.bash_profile file.

Open a new shell or source the file you used, e.g. source ~/.bashrc

Navigate to the folder you want to convert

$ toWebp my-image.png

or

$ toWebp