WordPress Image Compression Plugin.
To install "KP Image Optimizer":
- Download this archive file.
- Upload the "kp-image-optimizer" directory and all its contents to your /wp-content/plugins/ directory.
- Activate the plugin through the "Plugins" menu in WordPress.
- KP Image Optimizer (This plugin): GPL version 2 License or later version
- Image Optimizer: GPL version 2 License or later version
https://github.com/kaleidpixel/image-optimizer/blob/master/LICENSE - webp: BSD License
https://www.webmproject.org/license/software/ - gifsicle: GPL version 2 License
https://github.com/kohler/gifsicle/blob/master/COPYING - jpegtran: MIT License
https://github.com/imagemin/jpegtran-bin/blob/master/license - pngquant: GPL version 3 License
https://github.com/kornelski/pngquant/blob/master/COPYRIGHT - svg-sanitizer: GPL version 2 License
https://github.com/darylldoyle/svg-sanitizer/blob/master/LICENSE