https://password.us/tools/ Recent content in Tools on password.us - Your Guide to Password Security Hugo en-us Mon, 11 May 2026 00:00:00 +0000 https://password.us/tools/password-strength-checker/ Mon, 11 May 2026 00:00:00 +0000 https://password.us/tools/password-strength-checker/ <p>Type a password below to see how strong it is. <strong>This tool runs entirely in your browser. Your password is never sent anywhere.</strong></p> <div id="checker" style="max-width: 500px; margin: 2rem 0;"> <input type="text" id="pw-input" placeholder="Enter a password to test" style="width: 100%; padding: 12px; font-size: 18px; border: 2px solid #ccc; border-radius: 4px; font-family: monospace;"> <div id="pw-result" style="margin-top: 16px; padding: 16px; border-radius: 4px; display: none;"> <div id="pw-strength" style="font-size: 20px; font-weight: bold;"></div> <div id="pw-details" style="margin-top: 8px;"></div> <div id="pw-meter" style="margin-top: 12px; height: 8px; border-radius: 4px; background: #eee;"> <div id="pw-bar" style="height: 100%; border-radius: 4px; transition: width 0.3s, background 0.3s;"></div> </div> </div> </div> <script> (function() { var input = document.getElementById('pw-input'); var result = document.getElementById('pw-result'); var strength = document.getElementById('pw-strength'); var details = document.getElementById('pw-details'); var bar = document.getElementById('pw-bar'); input.addEventListener('input', function() { var pw = input.value; if (pw.length === 0) { result.style.display = 'none'; return; } result.style.display = 'block'; var score = 0; var notes = []; if (pw.length >= 8) score++; if (pw.length >= 12) score++; if (pw.length >= 16) score++; if (pw.length >= 20) score++; if (/[a-z]/.test(pw)) score++; if (/[A-Z]/.test(pw)) score++; if (/[0-9]/.test(pw)) score++; if (/[^a-zA-Z0-9]/.test(pw)) score++; if (pw.length < 8) notes.push('Too short -- aim for at least 12 characters'); if (!/[A-Z]/.test(pw) && !/[a-z]/.test(pw)) notes.push('Add some letters'); if (!/[0-9]/.test(pw)) notes.push('Adding numbers increases strength'); if (pw.length >= 16) notes.push('Good length'); if (pw.length >= 20) notes.push('Excellent length'); var common = ['password', '123456', 'qwerty', 'letmein', 'welcome', 'monkey', 'dragon', 'master', 'abc123', 'login', 'admin']; if (common.indexOf(pw.toLowerCase()) >= 0) { score = 0; notes = ['This is one of the most common passwords. Do not use it.']; } var labels = ['Very Weak', 'Weak', 'Fair', 'Good', 'Strong', 'Very Strong']; var colors = ['#d32f2f', '#e64a19', '#f57c00', '#fbc02d', '#388e3c', '#1b5e20']; var idx = Math.min(score, 5); if (score > 5) idx = 5; strength.textContent = labels[idx]; strength.style.color = colors[idx]; details.innerHTML = pw.length + ' characters' + (notes.length > 0 ? '<br>' + notes.join('<br>') : ''); bar.style.width = (Math.min(score, 5) / 5 * 100) + '%'; bar.style.background = colors[idx]; }); })(); </script> <h2 id="how-this-works">How this works</h2> <p>This checker evaluates your password based on:</p>