natthasath

Site Grayscale Toggle lets you turn your entire site grayscale and give visitors a clear on/off switch. It’s built to be CSP-friendly (no inline JS) and to avoid a flash-of-unstyled-content by injecting the initial state on the server side.
Features: 
– Grayscale filter site-wide via <code>html.is-grayscale { filter: grayscale(var(--sgt-level)); }</code>. 
– Intensity control (0–100) from Settings → Site Grayscale. 
– Show/Hide floating toggle button (bottom-right by default). 
– Shortcode: <code>[grayscale_toggle]</code> to place the switch anywhere (headers, menus, footers, blocks, widgets). 
– Remembers visitor preference with <code>localStorage</code> across pages. 
– CSP-safe: no inline JS; initial state added server-side to <code><html></code> to avoid FOUC. 
– Lightweight, theme-agnostic; works alongside most caching/CDN plugins.
Use cases include memorial/monochrome modes, accessibility preferences, or design experiments that you want users to control.

Site Grayscale Toggle

CSP-safe plugin that applies a site-wide grayscale filter with a front-end toggle. Control intensity (0–100) and whether to show a floating toggle but …

eng.hanan

This plugin convert your website to full greyscale colors. 
It’s suitable for those who work on govermental websites 
who usually changes appearance according to public events, 
so in case of a tragedic event and you want your website to show your mourning you can convert your whole website into greyscale with one click. 
also suitable for those who just wanna have fun with their websites, so Enjoy it..
<h3>Info</h3>
this plugin works perfectly on all browsers except for IE

1Click Grey Mode

This plugin convert your website to full greyscale colors.

Site Grayscale Toggle vs 1Click Grey Mode