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Convert images to WebP recursively

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 \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' \) -exec sh -c 'for f; do [ -e "$f.webp" ] || cwebp -quiet -q 80 "$f" -o "$f.webp"; done' sh {} +

Converts each JPEG and PNG to WebP and saves the result as bild.jpg.webp next to the original. Existing WebP files are skipped, so running it again only processes new images. WebP is usually much smaller than JPEG, which improves load time and LCP.

Note: cwebp is part of the webp package. The web server or a plugin has to take care of serving the files. When run as root, the new files belong to root, so better run it as the webspace user.

Also searched as

  • bulk convert jpg to webp linux
  • convert all images to webp command line
  • generate webp for wordpress uploads
  • cwebp recursive conversion

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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 {} +
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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 JPEG images losslessly with jpegoptim

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

Find images without a loading attribute on a page

$curl -s https://example.com/ | tr '\n' ' ' | grep -oiE '<img[^>]*>' | grep -vi 'loading='
harmlessImages and performance

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