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Is there a way to prevent YouTube from showing videos already watched in the list of suggested videos?

Currently, there is no treat/workaround to do so. Apart from manually block them one by one, there are no scalable solutions.

But there are extensions which can do so like:

• Chrome extension: Subscriptions Grid For YouTube™
  


• Chrome extension: YouTweak for YouTube™
  


• Chrome extension: YouTube Watched
  


• Chrome extension: Better Tube
  


• Chrome extension: Better Subscriptions for YouTube™ - (@Ashley)


• JS UserScript: YouTube: Hide Watched Videos
  

// ==UserScript==

// @version        1.1.1

// @name           Hide watched videos on YouTube

// @namespace      https://gist.github.com/xPaw/6324624

// @match          https://www.youtube.com/*

// @updateURL      https://gist.github.com/xPaw/6324624/raw/YoutubeHideWatched.user.js

// @downloadURL    https://gist.github.com/xPaw/6324624/raw/YoutubeHideWatched.user.js

// @grant          none

// ==/UserScript==



const app = document.querySelector( 'ytd-app' );



function HideVideos( a )

{

    app.querySelectorAll( 'ytd-thumbnail-overlay-resume-playback-renderer:not([data-hidden="true"])' ).forEach( element =>

    {

        element.dataset.hidden = true;



        while( ( element = element.parentNode ).tagName.toLowerCase() !== 'ytd-item-section-renderer' )

        {

            // Find the container element for this video

        }



        element.hidden = true;

    } );

}



function ProcessPage()

{

    if( !window.location.pathname.startsWith( '/feed/subscriptions' ) )

    {

        return;

    }



    const list = app.querySelector( 'ytd-section-list-renderer' );



    if( list.dataset.hooked )

    {

        return;

    }



    list.dataset.hooked = true;

    list.addEventListener( 'yt-next-continuation-data-updated', HideVideos );



    // TODO: Find an event to fix this

    new MutationObserver( HideVideos ).observe( list, { childList: true, subtree: true } );

}



app.addEventListener( 'yt-navigate-finish', ProcessPage );



ProcessPage();

AFAIK, there's no way to do this on YouTube itself, but I use a Chrome extension (Better Subscriptions for YouTube) that lets you hide watched videos from your subscriptions tab.