Images to WebP

Beschreibung

Statistics say that WebP format can save over a half of the page weight without losing images quality.
Convert PNG, JPG and GIF images to WebP and speed up your web, save visitors download data, make your Google ranking better.

  • automated test after plugin activation to make sure it will work on your server
  • works with all types of WordPress installations: domain, subdomain, subdirectory, multisite/network
  • works on Apache and NGiNX
  • image URL will be not changed so it works everywhere, in <img> src, srcset, <picture>, even in CSS backgrounds and there is no problem with cache
  • original files will be not touched
  • set quality of converted images
  • auto convert on upload
  • only convert image if WebP filesize is lower than original image filesize
  • bulk convert existing images to WebP ( you can choose folders )
  • bulk convert only missing images
  • works with `Fly Dynamic Image Resizer` plugin

Hooks for developers

itw_extensions

Maybe you want to support also less famous JPEG extension like jpe, jfif or jif

add_filter( 'itw_extensions', 'extra_itw_extensions', 10, 1 );
function extra_itw_extensions( $extensions ){
    $extensions[] = 'jpe';
    $extensions[] = 'jfif';
    $extensions[] = 'jif';
    return $extensions;
}

itw_sizes

Maybe you want to disable WebP for thumbnails

add_filter( 'itw_sizes', 'disable_itw_sizes', 10, 2 );
function disable_itw_sizes( $sizes, $attachmentId ){
    unset( $sizes['thumbnail'] );
    return $sizes;
}

itw_htaccess

Maybe you want to modify htaccess rules somehow

add_filter( 'itw_htaccess', 'modify_itw_htaccess', 10, 2 );
function modify_itw_htaccess( $rewrite_rules ){
    // do some magic here
    return $rewrite_rules;
}

$images_to_webp->convert_image()

Maybe you want to automatically generate WebP for other plugins

add_action( 'XXPLUGIN_image_created', 'XX_images_to_webp', 10, 2 );
function XX_images_to_webp( $image_path ){
    global $images_to_webp;
    $images_to_webp->convert_image( $image_path );
}

Screenshots

Installation

  1. Upload images-to-webp directory to the /wp-content/plugins/ directory
  2. Activate the plugin through the ‚Plugins‘ menu in WordPress

FAQ

Plugin requirements

It should work almost everywhere 😉
PHP 5.6 or higher
GD or Imagick extension with WebP support
Enabled server modules: mod_mime, mod_rewrite

WebP images stored location

WebP images are generated in same directory as original image. Example:
original img: /wp-content/uploads/2019/11/car.png
webp version: /wp-content/uploads/2019/11/car.png.webp

How to check if plugin works?

When you have installed plugin and converted all images, follow these steps:

  1. Run Google Chrome and enable Dev Tools (F12).
  2. Go to the Network tab click on Disable cache and select filtering for Img (Images).
  3. Refresh your website page.
  4. Check list of loaded images. Note Type column.
  5. If value of webp is there, then everything works fine.

Apache .htaccess

Plugin should automatically update your .htaccess with needed rules.
In case it’s not possible to write them automatically, screen with instructions will appear.
Anyway, here is how it should look like:

<IfModule mod_mime.c>
    AddType image/webp .webp
</IfModule>

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{HTTP_ACCEPT} image/webp
    RewriteCond %{REQUEST_FILENAME} "/"
    RewriteCond %{REQUEST_FILENAME} "\.(jpg|jpeg|png|gif)$"
    RewriteCond %{REQUEST_FILENAME}\.webp -f
    RewriteRule ^(.+)$ $1\.webp [NC,T=image/webp,E=webp,L]
</IfModule>

NGiNX config

After you activate plugin, screen with instructions will appear.
Anyway, here is how it should look like:

You need to add this map directive to your http config, usually nginx.conf ( inside of the http{} section ):

map $http_accept $webp_suffix{
    default "";
    "~*webp" ".webp";
}

then you need to add this to your server block, usually site.conf or /nginx/sites-enabled/default ( inside of the server{} section ):

location ~* ^/.+\.(png|gif|jpe?g)$ {
    add_header Vary Accept;
    try_files $uri$webp_suffix $uri =404;
}

ISP Manager

Are you using ISP Manager? Then it’s probably not working for you, but no worries, you just need to go to WWW domains and delete jpg|jpeg|png from the Static content extensions field.

Rezensionen

18. März 2022
Install then get a message "Add this to htaccess and reactivate". Well there's a waste of time for a start. Then, having added the code - It still does not activate!! Total waste of time
13. Dezember 2021
This is so easy to use! I was looking for a plugin that I could use on images outside of uploads to just create webp versions. It builds a directory tree for you to find the correct directory and it even gives you a find and convert missing images option. Brilliant, thank you!
6. August 2021
If you want to use this plugin, then you have to know a little about programming, because many errors occur during the plugin operation, and the plugin developer does not take any part in fixing them. It is quite obvious that the very name of the plugin implies that it is enough to download and install the plugin for it to work. But you can't do that with this plugin.
Alle 16 Rezensionen lesen

Mitwirkende & Entwickler

„Images to WebP“ ist Open-Source-Software. Folgende Menschen haben an diesem Plugin mitgewirkt:

Mitwirkende

„Images to WebP“ wurde in 3 Sprachen übersetzt. Danke an die Übersetzerinnen und Übersetzer für ihre Mitwirkung.

Übersetze „Images to WebP“ in deine Sprache.

Interessiert an der Entwicklung?

Durchstöbere den Code, sieh dir das SVN Repository an oder abonniere das Entwicklungsprotokoll per RSS.

Änderungsprotokoll

2.0

  • Tested on WP 6.0
  • convert and serve WebP images anywhere – not only in wp-content folder
  • option to delete original images after conversion

1.9.1

  • Tested on WP 5.9

1.9

  • Tested on WP 5.8
  • added some nonce checks and more security validations
  • better nginx instructions

1.8

  • Tested on WP 5.7
  • add more CURL options
  • fix backslashes for localhosts

1.7

  • Tested on WP 5.6
  • fixed problem on some multisites

1.6

  • Tested on WP 5.4
  • added support for Fly Dynamic Image Resizer plugin

1.5

  • notice when test image is not accessible

1.4

  • new test method

1.3

  • fixed text domain for translations

1.2

  • added instructions for NGiNX

1.1

  • make it works in multisite and subdirectory installs

1.0

  • First version