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Speed up your website by serving images in WebP format. This plugin will replace files in standard JPEG, PNG and GIF formats with WebP format.
After installation go to plugin settings and enable webp images. You can convert all images in Media Library or convert selected images only. The plugin will reduce the size of the image without compromising image quality.
The plugin will ditect if Webp images are supported by the client browser or not and then serve the images accordingly. 100 images can be converted per month.
<h4>Webp Converter PRO</h4>
The PRO version can convert 500 images per month. Get it for USD 2.00 Check it out <a href="https://www.aviplugins.com/webp-converter-pro/" rel="nofollow ugc">here</a>.
<blockquote>
Post your plugin related queries at <a href="https://www.aviplugins.com/support.php" rel="nofollow ugc">https://www.aviplugins.com/support.php</a>
</blockquote>

Webp Converter

Convert Media Library images in next-gen format and speed up your website

umertin

<a href="https://wordpress.org/plugins/nextgen-gallery/" rel="ugc">NextGEN Gallery</a> (NGG) is an excellent gallery for WordPress. Its major drawback, as far as I’m concerned, is the minimalistic image chooser. So I’ve taken the liberty to adapt the equally excellent <a href="http://g2image.steffensenfamily.com/" rel="nofollow ugc">g2image</a> image chooser, which also is embedded in the WPG2 connector to Gallery2.
This image chooser allows to browse through hierarchical albums and galleries, insert NGG tags for albums and galleries, as well as NGG and HTML tags for one or more images and thumbnails at a time.
<ul>
<li>On the left side of the image chooser pop-up there is the tree view of all albums and galleries. On the top are the albums and their galleries, then follow the galleries, which are not attached to any album.</li>
<li>On the upper right side there are the controls to insert the tags with their relevant options. Depending on which insert mode (NGG or HTML tag, image or thumbnail) is selected, only the relevant options are shown.</li>
<li>Below the controls, the thumbnails of the images in the selected gallery are shown, optionally together with their title, summary and description. There multiple images can be selected for insertion. </li>
</ul>
At present, the NGG tags [album], [nggallery], [thumb], [singlepic], and [imagebrowser], plus some html links are supported.
Default settings can be altered on the settings page.
NOTE: This plugin does not work with the new Gutenberg editor. There now is a new plugin that allows you to insert NGG tags for images, galleries and albums as Gutenberg blocks: <a href="https://de.wordpress.org/plugins/ngg-image-chooser-block/" rel="nofollow ugc">Image Chooser Block for NextGEN Gallery</a>. 
Alternatively you can switch to the classic editor, e.g. by using the <a href="https://wordpress.org/plugins/classic-editor/" rel="ugc">Classic Editor</a> plugin.
At this time, the image chooser is available in English (default) and German. Other translations are welcome and will be included in the next release.

NextGEN Gallery Image Chooser

Comfortable Image Chooser for the NextGEN Gallery, based on g2image

Webp Converter vs NextGEN Gallery Image Chooser