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Optimize JPEG images losslessly with jpegoptim

cautionImages and performancedebian, ubuntu

Caution: This command changes the system. Understand what it does before you run it.

Adjust the values, the command updates live
user@server
find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f \( -iname '*.jpg' -o -iname '*.jpeg' \) -exec jpegoptim --strip-all --preserve {} +

Optimizes the Huffman tables of each JPEG without re-encoding, so the pixels stay identical. --strip-all removes EXIF, comments and color profiles, --preserve keeps the modification time. The output shows the savings in percent for each file.

Note: The files are overwritten in place, and removed metadata (copyright, camera data, ICC profile) is gone afterwards. Install the jpegoptim package if needed and make a backup first.

Also searched as

  • lossless jpg compression linux
  • shrink images without quality loss
  • run jpegoptim on uploads folder
  • remove metadata from jpeg

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All in Images and performance

Limit JPEG quality to a maximum with jpegoptim

$find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f \( -iname '*.jpg' -o -iname '*.jpeg' \) -exec jpegoptim --strip-all --preserve --max=82 {} +
destructiveImages and performance

Convert images to AVIF recursively

$find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' \) -exec sh -c 'for f; do [ -e "$f.avif" ] || avifenc -s 6 "$f" "$f.avif" >/dev/null; done' sh {} +
cautionImages and performance

Convert images to WebP recursively

$find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' \) -exec sh -c 'for f; do [ -e "$f.webp" ] || cwebp -quiet -q 80 "$f" -o "$f.webp"; done' sh {} +
cautionImages and performance

Find large images in wp-content/uploads

$find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.gif' -o -iname '*.webp' \) -size +500k -printf '%s\t%p\n' | sort -rn | head -50 | numfmt --field=1 --to=iec
harmlessImages and performance

Optimize PNG images losslessly with optipng

$find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f -iname '*.png' -exec optipng -o2 -strip all -preserve {} +
cautionImages and performance

Find images larger than a given pixel size

$find /var/www/vhosts/example.com/httpdocs/wp-content/uploads -type f \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' \) -exec identify -format '%w %h %i\n' {} + 2>/dev/null | awk -v max=2560 '$1 > max || $2 > max'
harmlessImages and performance

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