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HTML 

              
                <!doctype html>
<html lang="es">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <meta name="description" content="Generación de contraseñas seguras">
  <meta name="author" content="Gonzalo Chacaltana">
  <title>Generación de contraseñas seguras</title>
  <link href="https://getbootstrap.com/docs/4.4/dist/css/bootstrap.min.css" rel="stylesheet"
    integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous" />
  <meta name="theme-color" content="#563d7c" />
</head>
<body class="bg-light">
  <div class="container">
    <div class="py-5 text-center">
      <h2>Generar Contraseñas Seguras</h2>
      <p class="lead">
        En este sitio web puedes crear contraseñas aleatorias seguras para tus aplicaciones.
      </p>
    </div>
    <div class="row">
      <div class="col-md-4 order-md-2 mb-4">
        <h4 class="d-flex justify-content-between align-items-center mb-3">
          <span class="text-muted">Contraseñas Seguras</span>
          <span id="span_pass_number" class="badge badge-secondary badge-pill">0</span>
        </h4>
        <ul id="ul_passwords" class="list-group mb-3">
        </ul>
      </div>
      <div class="col-md-8 order-md-1">
        <h4 class="mb-3">Configuración</h4>
        <form id="frmSecurePass" class="needs-validation">
          <hr class="mb-4">
          <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="chk_uppercase" checked="true">
            <label class="custom-control-label" for="chk_uppercase">Utilizar letras mayúsculas</label>
          </div>
          <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="chk_lowercase" checked="true">
            <label class="custom-control-label" for="chk_lowercase">Utilizar letras minusculas </label>
          </div>
          <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="chk_numbers" checked="true">
            <label class="custom-control-label" for="chk_numbers">Utilizar Números </label>
          </div>
          <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="chk_symbols" checked="true">
            <label class="custom-control-label" for="chk_symbols">Utilizar simbolos </label>
          </div>
          <hr class="mb-4">
          <div class="row">
            <div class="col-md-6 mb-3">
              <label for="cc-name">Longitud de contraseña</label>
              <input type="number" min="6" max="20" value="8" class="form-control" id="password_length"
                placeholder="Ejem: 10" required>
            </div>
            <div class="col-md-6 mb-3">
              <label for="cc-number">Cantidad de contraseñas</label>
              <input type="number" min="1" value="3" max="15" class="form-control" id="password_count"
                placeholder="Ejem: 10" required>
            </div>
          </div>
          <hr class="mb-4">
          <button id="btnGenerate" class="btn btn-primary btn-lg btn-block" type="submit">Generar contraseñas</button>
        </form>
      </div>
    </div>
    <footer class="my-5 pt-5 text-muted text-center text-small">
      <p class="mb-1">&copy; 2020 <a href="http://itensoft.net/" target="_blank">Itensoft Digital Solutions</a></p>
      <ul class="list-inline">
        <li class="list-inline-item"><a href="http://itensoft.net/politica-de-privacidad" target="_blank">Política de
            Privacidad</a></li>
      </ul>
    </footer>
  </div>
  <script src="https://code.jquery.com/jquery-3.4.1.slim.min.js"
    integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n"
    crossorigin="anonymous"></script>
</body>
</html>
!

CSS 

              
                .container {
  max-width: 960px;
}

.lh-condensed {
  line-height: 1.25;
}
!

JS 

              
                /**
 * @file Script para generar contraseñas seguras.
 * @author Gonzalo Chacaltana <gchacaltanab@outlook.com>
 * @class SecurePassword
 * @version 1.1
*/
const SecurePassword = {
    password_length: 6,
    password_counter: 1,
    allowedValuesString: '',
    allowedValues: {
        uppercase: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
        lowercase: 'abcdefghijklmnopqrstuvwxyz',
        numbers: '0123456789',
        symbols: '!@#$%^&*()_+'
    },
    validateChecked: function(){
        const chkboxes = document.getElementsByClassName("custom-control-input");
        let numberChecks = 0;
        Array.prototype.forEach.call(chkboxes, function(el) {
            if (el.checked) {
                numberChecks+=1;
            }
        });
        if (numberChecks==0) {
            throw new Error("Debe seleccionar al menos una opción de valores permitidos.");
        }
    },
    generate: function () {
        this.validateChecked();    
        this.password_length = parseInt(document.getElementById("password_length").value);
        this.password_counter = parseInt(document.getElementById("password_count").value);
        const ul = document.getElementById('ul_passwords');
        ul.innerHTML = '';
        this.getAllowedValuesString();
        for (let i = 0; i < this.password_counter; i++) {
            let li = document.createElement('li');
            li.className = "list-group-item d-flex justify-content-between lh-condensed";
            li.textContent = this.getPassword();
            ul.appendChild(li);
        }
        document.getElementById("span_pass_number").textContent = this.password_counter;
    },
    getAllowedValuesString: function () {
        if (document.getElementById("chk_uppercase").checked) {
            this.allowedValuesString += this.allowedValues.uppercase;
        }
        if (document.getElementById("chk_lowercase").checked) {
            this.allowedValuesString += this.allowedValues.lowercase;
        }
        if (document.getElementById("chk_numbers").checked) {
            this.allowedValuesString += this.allowedValues.numbers;
        }
        if (document.getElementById("chk_symbols").checked) {
            this.allowedValuesString += this.allowedValues.symbols;
        }
    },
    getPassword: function () {
        let password = '';
        for (let i = 0; i < this.password_length; i++) {
            let random = Math.floor(Math.random() * this.allowedValuesString.length);
            password += this.allowedValuesString[random];
        }
        return password;
    }
};

(function () {
    'use strict'
    window.addEventListener('load', function () {
        const $frm = document.getElementById("frmSecurePass");
        $frm.addEventListener("submit", (e) => {
            e.preventDefault();
            try {
                const oSecurePassword = Object.create(SecurePassword);
                oSecurePassword.generate();
            } catch (err) {
                alert(err.message);
                console.warn(err.message);
            }
        });
    }, false)
}())
!
999px

Console