Delete all Google photos in small batches from GUI using Tampermonkey. Totally unattended JS version for tampermonkey. It launches on page load and it will loop till all photos are deleted.

delete_google_photos.js

// ==UserScript==
// @name         deleteGooglePhotos
// @namespace    http://tampermonkey.net/
// @version      2024-07-23
// @description  Delete all Google photos in small batches. Based on original script from [Reddit](https://www.reddit.com/r/googlephotos/comments/kmolp9/comment/l428wca/)
// @author       Harshit Sanghvi, u/ApplicationJunior832
// @match        https://photos.google.com/
// @icon         https://www.google.com/s2/favicons?sz=64&domain=google.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    console.clear();
    console.log("Google Photos Deleter V2");

    const trigger = (el, etype, custom) => {
        const evt = custom ?? new Event( etype, { bubbles: true } );
        el.dispatchEvent( evt );
    };

    function fDelete() {
        console.log("fDelete()");

        let dd = document.getElementsByTagName("button");

        for (let i = 0; i < dd.length; i++) {
            let d = dd[i];

            if (d.ariaLabel == "Delete") {
                setTimeout( _ => trigger( d, 'click' ), 300);
                break;
            }
        }
    }

    function fDeleteConfirm() {
        console.log("fDeleteConfirm()");

        let dd = document.getElementsByTagName("button");

        for (let i = 0; i < dd.length; i++) {
            let d = dd[i];

            if (d.innerText == "Move to trash") {
                setTimeout( _ => trigger( d, 'click' ), 300);
                break;
            }
        }
    }

    function fSelect() {
        console.log("fSelect()");

        let dd = document.getElementsByTagName("div");
        let clickedCount = 0;

        for (let i = 0; i < dd.length; i++) {
            let d = dd[i];

            if (d.role == "checkbox" && (d.ariaLabel && d.ariaLabel.indexOf("Select") < 0) && clickedCount < 1000) {
                clickedCount++;
                setTimeout( _ => trigger( d, 'click' ), 5 * clickedCount);
            }
        }
    }

    function mainLoop(count) {
        console.clear();
        console.log("mainLoop()", count);

        if (count++ > 10) {
            // Reload is needed after few batch deletes
            console.log("mainLoop() - Reloading Page..");
            window.top.location.reload();
        }

        setTimeout(function() { fSelect(); }, 5 );
        setTimeout(function() { fDelete(); }, 7 * 1000);
        setTimeout(function() { fDeleteConfirm(); }, 10 * 1000);

        setTimeout(function() {
            console.log("call mainLoop()");
            mainLoop(count++)
        }, 15 * 1000);
    }

    setTimeout(function() { mainLoop(0); }, 30 * 1000);

})();