"WhatsApp Web" Banner Remover - User JS for Tampermonkey / Greasemonkey / Violentmonkey.

remove-whatsapp-welcome-banner.user.js

// ==UserScript==
// @name         WhatsApp Welcome Banner Remover
// @namespace    https://github.com/gustavomdsantos
// @version      1.2
// @description  Removes the annoying WhatsApp welcome banner.
// @author       Gustavo Moraes ([email protected])
// @match        https://web.whatsapp.com/*
// @icon         https://gist.githubusercontent.com/gustavomdsantos/0fa1710f7bb121a2818efc1520cf3e33/raw/Welcome-WhatsApp-Remover-icon.png
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';

    const targetSelector = ".xktia5q.x27kpxv.x135pmgq.x2b8uid";
    const upperDivSelector = ".xsknx04";

    function removeWelcomeBanner() {
        const banner = document.querySelector(targetSelector);
        if (banner) {
            console.log("[UserScript] Welcome banner found, removing...");
            banner.remove();
        }

        const upperDiv = document.querySelector(upperDivSelector);
        if (upperDiv) {
            upperDiv.style.backgroundColor = "#070707";
        }
    }

    // Runs on initial load
    removeWelcomeBanner();

    // Observe changes in DOM
    const observer = new MutationObserver(() => {
        removeWelcomeBanner();
    });

    observer.observe(document, {
        childList: true,
        subtree: true
    });

})();

Welcome-WhatsApp-Remover-icon.png

Welcome-WhatsApp-Remover-icon.svg