Local WebP optimizer for WordPress. Free converts images to WebP; Pro adds AVIF and site-wide image tools.
Alternatives to Kas Viewer
Plugins below are selected for functional relevance and current directory signals. Active-install counts do not affect this ranking.
Relevant replacements
WordPress plugins with similar use cases
Compatibility and update metadata provide context, not a quality guarantee. Review each plugin’s details for your site.
Five Number Lightboxv1.3.1
A small image lightbox with no jQuery and no dependencies. Works on old posts and new ones without editing any content.
CTCL Image Galleryv2.3.0
A responsive image gallery block with thumbnail navigation, refined captions, and a fullscreen CTC overlay viewer.
A responsive image lightbox for WordPress galleries, WordPress attachments & FooGallery
Image Projectorv6.5.3
A unique, low-profile plug-and-play image viewer.
A lightweight responsive modal gallery for WordPress powered by Swiper.js with native gallery and keyboard navigation support.
A lightweight Gutenberg Gallery lightbox plugin with fullscreen viewing, next/previous navigation, keyboard controls and responsive design.
Create beautiful galleries from PDFs (and other files), with customizable layouts, lightbox viewer, and drag-and-drop management.
Add a full-screen image reader to WordPress posts and pages.
LC Lightbox Litev1.1.0
Give your website a modern image viewer in just one click. Responsive, customizable and free.