OTP Generator
Generate secure one-time passwords instantly with our free online tool
Common OTP Purposes
Login Verification
Secure login codes
Password Reset
Reset password codes
2FA Authentication
Two-factor codes
Email Verification
Email confirmation
0 characters
0 digits
5 min
OTP Generation Results
6-digit numeric OTP generated successfully
Your formatted OTP preview will appear here
✅ Secure OTP generated with high entropy
| OTP Type | Character Set | Security Level | Use Case |
|---|---|---|---|
| Numeric | 0-9 | Medium | Simple verification, SMS codes |
| Alphanumeric | 0-9, A-Z, a-z | High | Password resets, account recovery |
| Mixed Case | 0-9, A-Z, a-z, symbols | Very High | High-security authentication |
Benefits of Using Our OTP Generator
Instant Generation: Create secure OTPs in milliseconds
High Security: Cryptographically secure random generation
Customizable: Adjust length, type, and expiration
Mobile Friendly: Works perfectly on all devices
Why Use Our OTP Generator?
- Free Online OTP Generation Tool
- Multiple OTP Types and Formats
- Customizable Security Parameters
- Secure Random Generation
- Expiry Time Configuration
- Instant Generation
- No Registration Required
- Works on All Devices
- Copy and Download Features
- Security Analysis Metrics
💡 Pro Tip: Always set a reasonable expiry time for OTPs to enhance security. Never share OTPs via insecure channels like unencrypted emails or SMS. For sensitive operations, use longer OTPs (8+ digits) with mixed character sets.
OTP generated successfully!
`;
}function copyToClipboard() {
if (!generatedOtp) {
alert('Please generate an OTP first');
return;
}
const textarea = document.getElementById('outputOtp');
textarea.select();
textarea.setSelectionRange(0, 99999); // For mobile devices
try {
const successful = document.execCommand('copy');
if (successful) {
showNotification('OTP copied to clipboard!');
} else {
showError('Failed to copy OTP to clipboard.');
}
} catch (err) {
console.error('Failed to copy: ', err);
showError('Failed to copy OTP to clipboard.');
}
}function downloadOtp() {
if (!generatedOtp) {
alert('Please generate an OTP first');
return;
}
const purpose = document.getElementById('otpPurpose').value;
const type = document.getElementById('otpType').value;
const blob = new Blob([generatedOtp], { type: 'text/plain' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `otp_${purpose.replace(/\s+/g, '_')}_${type}_code.txt`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
showNotification('OTP downloaded successfully!');
}function showNotification(message) {
const notification = document.getElementById('notification');
notification.textContent = message;
notification.classList.add('show');
setTimeout(() => {
notification.classList.remove('show');
}, 3000);
}function showError(message = "Please enter a purpose for the OTP.") {
const errorElement = document.getElementById('errorMessage');
errorElement.textContent = message;
errorElement.classList.add('show');
}function hideError() {
document.getElementById('errorMessage').classList.remove('show');
}function resetForm() {
// Reset form fields
document.getElementById('otpPurpose').value = 'Login';
document.getElementById('otpLength').value = '6';
document.getElementById('otpType').value = 'numeric';
document.getElementById('expiryTime').value = '5';
document.getElementById('includeSymbols').checked = true;
document.getElementById('includeLowercase').checked = true;
document.getElementById('includeUppercase').checked = true;
document.getElementById('uniqueCodes').checked = true;
// Reset output
document.getElementById('outputOtp').value = '';
generatedOtp = '';
// Reset counts
updateOtpStats('', 'numeric', 6, 5);
// Reset UI
document.getElementById('resultsContainer').style.display = 'none';
document.getElementById('previewPlaceholder').style.display = 'flex';
document.getElementById('otpPreview').style.display = 'none';
document.getElementById('qualityInfo').style.display = 'none';
document.getElementById('otpStats').style.display = 'none';
// Disable buttons
document.getElementById('copyBtn').disabled = true;
document.getElementById('downloadBtn').disabled = true;
// Hide progress bar
document.getElementById('progressBar').style.display = 'none';
// Hide any errors
hideError();
// Generate new OTP
generateOtp();
}