What Is a Man-in-the-Middle Attack? Simple Explanation
A man-in-the-middle attack means someone secretly sits between you and who you think you're talking to, reading or altering everything. Here is how it works and how to stop it.
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Instant 2FA Code Generator
Generate 2FA codes online instantly. No app, no account needed. This free 2FA generator computes your TOTP one-time password entirely in your browser. Your secret key never leaves your device.
Your Browser Only
Saved 2FA Accounts
Quick access to your last 20 2FA accounts, stored locally in your browser, never on our servers.
How It Works
3 Steps to Your 2FA Code
No signup. No install. Works in every modern browser.
1. Enter Secret Key
Paste the Base32 secret key from your account's 2FA setup page. It looks like JBSWY3DPEHPK3PXP.
2. Get 6-Digit Code
Your current TOTP code appears instantly and refreshes every 30 seconds, synced with your account.
3. Copy & Login
Click Copy, paste into the 2FA field on the login page. Done. You're in.
Why 2FA Fast
Built for Speed and Privacy
Instant Generation
Codes appear in under 100ms. No loading screens.
Zero Server Data
Your secrets never touch our servers. Ever.
Shareable URLs
Create a direct link to instantly view any code.
Works Everywhere
Mobile, desktop, any browser, no app needed.
More Tools
2FA & Security Tools: Everything You Need
Free 2FA and security utility tools, all browser-side, all private.
QR Code Generator
Generate an otpauth:// QR code to add your secret to any authenticator app.
2FA Secret Generator
Generate a cryptographically secure Base32 secret for new 2FA setups.
Hash Generator
Generate MD5, SHA-256, SHA-512 hashes and HMAC signatures instantly in your browser.
Base32 Encoder/Decoder
Encode or decode any text in Base32 format, the standard for 2FA secrets.
Cookie Converter
Convert cookies between Netscape format and JSON, useful for session management.
Secure Notepad
A local-only notepad. Your notes stay in your browser, never on a server.
QR Code Decoder
Upload a QR code image or use your webcam to decode it instantly, 100% in your browser.
Password Generator
Generate strong, random passwords in bulk. Export to CSV or TXT. All client-side.
Get 2FAFast Everywhere
Your 2FA Codes, One Click Away
Install the free 2FAFast browser extension for unlimited accounts, offline access, and QR export/import. Mobile apps for Android & iOS are on the way.
FAQ
2FA Frequently Asked Questions
Yes. Your secret key is processed entirely in your browser using the Web Crypto API. It is never transmitted to our servers. You can open browser DevTools → Network tab while generating a code; you will see zero outgoing requests.
A 2FA secret key is a Base32-encoded string (e.g.
JBSWY3DPEHPK3PXP) shared between your account provider and your authenticator. It is used to compute time-based one-time passwords (TOTP) per RFC 6238.No. 2FA Fast stores nothing on our servers. The optional Save feature stores your labels and secrets in your browser's
localStorage, it never leaves your device and is not shared with us.TOTP (Time-based One-Time Password) generates a 6-digit code every 30 seconds using your secret key and the current time. Both your authenticator and the website compute the same code, so the server can verify you without the code ever being transmitted over the network.
Yes. 2FA Fast uses the same TOTP algorithm (RFC 6238, HMAC-SHA1) as Google Authenticator, Microsoft Authenticator, Authy, and all standard apps. The generated codes are identical. It is ideal as a backup when your phone is unavailable.
From the Blog
Learn About 2FA Security
What Is End-to-End Encryption? Plain English Explanation
End-to-end encryption means only you and the person you're talking to can read your messages. Not the app, not the company, not anyone in between. Here is how it works and where it matters.
Read more →Why Security Questions Are Weak (And What to Do Instead)
Your mother's maiden name is not a secret, and your first pet is on Facebook. Here is why security questions are one of the weakest links in account security, and how to neutralise them.
Read more →Ready to Generate Your 2FA Code?
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