Create a Modern Login and Registration Form Using Only HTML, CSS, and JavaScript
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Login and registration forms are at the heart of most interactive websites, from social platforms to shopping sites. If you’re a beginner in web development, this is a perfect mini project to learn core concepts like form creation, layout design, and DOM manipulation.

In this blog, we’ll build a beautiful, responsive login and registration form using pure HTML, CSS, and JavaScript, with no libraries, no frameworks, and no backend. Just front-end magic.

If you are interested in login and registration form templates, we have designed a collection of pre-built forms. Check Formly, specially designed to help developers create stylish, responsive, and functional login forms effortlessly.

Step 1: HTML to Build the Structure

First, we’ll create a simple layout with two forms inside a container, one for login and one for registration.

<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Login & Register</title>
  <link rel="stylesheet" href="style.css" />
  <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap" rel="stylesheet">
</head>
<body>
  <div class="wrapper">
    <div class="form-box">
      <div class="toggle-buttons">
        <button id="loginBtn" class="active" onclick="showLogin()">Login</button>
        <button id="registerBtn" onclick="showRegister()">Register</button>
      </div>

      <form id="loginForm" class="form active-form">
        <h2>Welcome Back</h2>
        <input type="text" placeholder="Username" required />
        <input type="password" placeholder="Password" required />
        <button type="submit">Login</button>
      </form>

      <form id="registerForm" class="form">
        <h2>Create Account</h2>
        <input type="text" placeholder="Username" required />
        <input type="email" placeholder="Email" required />
        <input type="password" placeholder="Password" required />
        <button type="submit">Register</button>
      </form>
    </div>
  </div>

  <script src="script.js"></script>
</body>
</html>

Step 2: CSS to Add Style

Let’s design a clean and modern UI. Smooth gradients, shadows, and rounded corners make it visually appealing.

/* style.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #71b7e6, #9b59b6);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .wrapper {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    width: 350px;
    padding: 30px;
    transition: all 0.3s ease;
  }
  
  .form-box {
    width: 100%;
  }
  
  .toggle-buttons {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
  }
  
  .toggle-buttons button {
    flex: 1;
    padding: 10px;
    border: none;
    background: #f1f1f1;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s ease;
    border-radius: 8px;
  }
  
  .toggle-buttons button.active {
    background: #9b59b6;
    color: white;
  }
  
  .form {
    display: none;
    flex-direction: column;
  }
  
  .form.active-form {
    display: flex;
  }
  
  .form h2 {
    margin-bottom: 20px;
    color: #333;
  }
  
  .form input {
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 14px;
  }
  
  .form button {
    padding: 12px;
    background: #9b59b6;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background 0.3s ease;
  }
  
  .form button:hover {
    background: #8c40aa;
  }
  
  @media (max-width: 400px) {
    .wrapper {
      width: 90%;
    }
  }

Step 3: JavaScript to Add Functionality

Now, we’ll add a simple script to smoothly toggle between the two forms.

// script.js
const loginBtn = document.getElementById("loginBtn");
const registerBtn = document.getElementById("registerBtn");
const loginForm = document.getElementById("loginForm");
const registerForm = document.getElementById("registerForm");

function showLogin() {
  loginForm.classList.add("active-form");
  registerForm.classList.remove("active-form");
  loginBtn.classList.add("active");
  registerBtn.classList.remove("active");
}

function showRegister() {
  registerForm.classList.add("active-form");
  loginForm.classList.remove("active-form");
  registerBtn.classList.add("active");
  loginBtn.classList.remove("active");
}

Final Thoughts

You’ve just created a fully functional and visually appealing login and registration form using only HTML, CSS, and JavaScript! This layout is perfect for integrating into any website or project.

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