Bootstrap 5 Password Strength Meter

Bootstrap 5 Password Strength Meter
Code Snippet:Password Strength Meter (Vanilla JS)
Author: Marcus
Published: September 25, 2023
Last Updated: September 25, 2023
Downloads: 884
License: MIT
Edit Code online: View on CodePen
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This Bootstrap 5 code snippet helps you to create a password input field with a strength meter. It visually indicates password strength. It assesses the password’s complexity and uses color-coded meter sections to show strength levels, helping you create more secure passwords effortlessly.

You can implement this code in the password input field of your registration or sign-up forms to encourage users to create strong passwords when creating accounts.

How to Create Bootstrap 5 Password Strength Meter

1. First, make sure to include the Bootstrap 5 CSS and JavaScript libraries by adding the necessary CDN links to your HTML header.

<link rel='stylesheet' href='[email protected]/dist/css/bootstrap.min.css'>
<script src='[email protected]/dist/umd/popper.min.js'></script> 
<script src='[email protected]/dist/js/bootstrap.min.js'></script>

2. Now, add the HTML structure to your web page. The following code demonstrates how to set up a simple password input field with the strength meter:

<body class="container-fluid bg-body-tertiary d-block">
    <div class="row justify-content-center">
        <div class="row justify-content-center">
            <div class="col-12 col-md-6 col-lg-4" style="min-width: 500px;">
                <div class="card bg-white mb-5 mt-5 border-0" style="box-shadow: 0 12px 15px rgba(0, 0, 0, 0.02);">
                    <div class="card-body p-5">
                        <label for="password-input" class="form-label fw-bold">Password</label>
                        <input type="password" class="form-control" id="password-input" autocomplete="off"
                               aria-label="Password" aria-describedby="passwordHelp">
                        <div class="password-meter">
                            <div class="meter-section rounded me-2"></div>
                            <div class="meter-section rounded me-2"></div>
                            <div class="meter-section rounded me-2"></div>
                            <div class="meter-section rounded"></div>
                        <div id="passwordHelp" class="form-text text-muted">Use 8 or more characters with a mix of
                            letters, numbers &

3. Add the following CSS code to style the password strength meter. This code defines the appearance of the meter sections and differentiates them based on strength.

.password-meter {
    display: flex;
    height: 5px;
    margin-top: 10px;

.meter-section {
    flex: 1;
    background-color: #ddd;

.weak {
    background-color: #ff4d4d;

.medium {
    background-color: #ffd633;

.strong {
    background-color: #00b300;

.very-strong {
    background-color: #009900;

4. To make the password strength meter functional, add the following JavaScript code. This code calculates the strength of the entered password and updates the meter sections accordingly.

const passwordInput = document.getElementById('password-input');
const meterSections = document.querySelectorAll('.meter-section');

passwordInput.addEventListener('input', updateMeter);

function updateMeter() {
    const password = passwordInput.value;
    let strength = calculatePasswordStrength(password);

    // Remove all strength classes
    meterSections.forEach((section) => {
        section.classList.remove('weak', 'medium', 'strong', 'very-strong');

    // Add the appropriate strength class based on the strength value
    if (strength >= 1) {
    if (strength >= 2) {
    if (strength >= 3) {
    if (strength >= 4) {

function calculatePasswordStrength(password) {
    const lengthWeight = 0.2;
    const uppercaseWeight = 0.5;
    const lowercaseWeight = 0.5;
    const numberWeight = 0.7;
    const symbolWeight = 1;

    let strength = 0;

    // Calculate the strength based on the password length
    strength += password.length * lengthWeight;

    // Calculate the strength based on uppercase letters
    if (/[A-Z]/.test(password)) {
        strength += uppercaseWeight;

    // Calculate the strength based on lowercase letters
    if (/[a-z]/.test(password)) {
        strength += lowercaseWeight;

    // Calculate the strength based on numbers
    if (/\d/.test(password)) {
        strength += numberWeight;

    // Calculate the strength based on symbols
    if (/[^A-Za-z0-9]/.test(password)) {
        strength += symbolWeight;

    return strength;

That’s it! You’ve successfully implemented a Password Strength Meter. This tool enhances user security by guiding them to create stronger passwords. Feel free to customize the CSS styles to match your project’s design.

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