Imagine someone stole your password. Is your account safe? If you have 2FA — YES. If not — you are in great danger.

What is 2FA?

2FA (Two-Factor Authentication) is an additional security layer that requires two different proofs of identity during login:

🔑 Something you know — password
📱 Something you have — phone code, hardware key

Even if an attacker steals your password, without the second factor they cannot access the account.

How does TOTP work?

The most common form of 2FA is TOTP (Time-based One-Time Password). It works like this:

At registration, the server generates a secret key and shows it as a QR code
You scan the QR code in an app like Google Authenticator or Authy
App and server share the same secret
Every 30 seconds, both generate the same 6-digit code based on the secret and current time
You enter the code during login

Key point: the code changes every 30 seconds. Even if someone intercepts it, they cannot use it later.

Why is 2FA important?

The statistics are clear:

🔒 2FA blocks 99.9% of automated attacks on accounts
🔒 2FA blocks 96% of phishing attacks
🔒 81% of hacked accounts did not have 2FA

In 2026, a password alone is no longer enough.

Types of 2FA

1. SMS codes (weakest)

Code arrives via SMS. Not secure because attackers can intercept SMS (SIM swapping). Use only if nothing else is available.

2. TOTP apps (recommended)

Google Authenticator, Authy, Microsoft Authenticator. Generate codes offline, without internet.

3. Hardware keys (most secure)

YubiKey, Titan Security Key. A physical USB key you must insert into the computer. Practically impossible to hack.

4. Biometrics

Fingerprint, Face ID. Used on mobile devices.

How to enable 2FA?

Step 1: Choose an app

We recommend:

📱 Google Authenticator — simple, synchronized
📱 Authy — backup and multi-device
📱 Microsoft Authenticator — for Microsoft accounts

Step 2: Scan the QR code

On every site that supports 2FA, in security settings, you will find a QR code. Open the app and scan it.

Step 3: Save backup codes

Every site gives you 10 backup codes. Save them in a safe place — used if you lose your phone.

Test your TOTP

If you have a secret key and want to generate a TOTP code without an app, use our free 2FA TOTP Generator. Everything happens locally in the browser — your secret never leaves the device.

Why use the ScanWeb TOTP Generator?

✅ 100% offline — uses Web Crypto API
✅ No upload — secret stays in browser
✅ No registration — open and use
✅ Works in browser — on any device

Which accounts to enable 2FA on?

Priority:

📧 Email — because via email you can reset everything else
🏦 Bank accounts — direct damage
💼 Business accounts — LinkedIn, GitHub, Slack
🛒 Online stores — Amazon, PayPal
📱 Social networks — Facebook, Instagram

Conclusion

2FA is the easiest and most effective way to protect your accounts. Enable it today — it will take you 5 minutes per account.

Also check your password strength with our Password Strength Checker.

What is 2FA and Why Do You Need It?