This snippet detects if the browser supports WebP images and then serves a .webp image instead of jpg/png if a .webp file is available at the same location as the supplied jpg/png/gif. Read more about the webp format and other ways to serve it here: https://images.guide.
Place the following in your .htaccess file and jpg/png/gif images will be replaced with WebP images if found in the same folder.
<IfModule mod_rewrite.c>
RewriteEngine On
# Check if browser supports WebP images
RewriteCond %{HTTP_ACCEPT} image/webp
# Check if WebP replacement image exists
RewriteCond %{DOCUMENT_ROOT}/$1.webp -f
# Serve WebP image instead
RewriteRule (.+)\.(jpe?g|png|gif)$ $1.webp [T=image/webp,E=REQUEST_image]
</IfModule>
<IfModule mod_headers.c>
# Vary: Accept for all the requests to jpeg, png and gif
Header append Vary Accept env=REQUEST_image
</IfModule>
<IfModule mod_mime.c>
AddType image/webp .webp
</IfModule>Controlling your files using htaccess sure is fun, but a more responsible way is to use the <picture>-element instead of this solution. It has great support in all major browsers and has a built-in fallback for those without it.
<picture>
<source srcset="/path/to/image.webp" type="image/webp">
<img src="/path/to/image.jpg" alt="">
</picture>
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