Free 2FA Authenticator & Code Generator

You get 2FA from the account you want to protect: open its settings, find "Security" or "Login & security", and look for "Two-factor authentication" or "2-step verification". Pick the authenticator-app option, scan the QR code — or click "can't scan?" to reveal the setup key (a Base32 string or an otpauth:// URI) — and paste it into the generator at the top of this page. Enter the live code to confirm the setup, then save the recovery codes the service shows you.

Four steps, about two minutes: 1) Open the account or security settings and select "Two-factor authentication". 2) Choose "Use an authenticator app" (avoid SMS if a better option exists). 3) Scan the QR code with your authenticator — or reveal and save the setup key instead. 4) Enter the live code to finish, then download or print the backup codes. We publish per-service guides for Google, GitHub, Discord, Binance and more.

After your password, the service asks for a second proof of identity. With the standard TOTP method (RFC 6238), your authenticator calculates a 6-digit code from a shared secret plus the current time, and the server runs the identical calculation and compares the two. The code is derived every 30 seconds and is worthless after it expires — so a leaked password alone can no longer open your account.

It protects any login somebody else wants: email and cloud suites (Google, Microsoft, Apple), banking and brokerage accounts, crypto exchanges (Binance, Coinbase, Kraken), developer platforms (GitHub, AWS), gaming (Steam, Discord, Twitch), and social media (X, Instagram). Companies use it for VPNs, email and admin consoles too. Anywhere a site offers an "authenticator app" option, that is the 2FA lane.

No — no security control is, and honest guides say so. 2FA kills stolen-password attacks, but a fresh code typed into a fake site within its 30-second life still gets phished, malware already on your device can hijack the session itself, and SMS codes can fall to SIM-swap attacks. Even with those caveats, an account with 2FA is far harder to break into than one without it.

No government makes it compulsory, but spreading platforms do: GitHub has required it for code contributors since 2023, banks and crypto exchanges force it on, and employers routinely mandate it for work logins. Everywhere else it is optional but strongly recommended. Treat it as compulsory anyway for your most valuable account — your email — because whoever controls your inbox can reset everything else.

Because passwords keep failing in exactly the same ways. Billions of real passwords are already public from breaches, and attackers replay them at every other site around the clock (credential stuffing). Microsoft reports that 2FA blocks over 99.9% of automated account-takeover attacks — it is the cheapest upgrade that protects your email, banking, gaming, and crypto against the threats that actually happen.

It depends entirely on the second factor. SMS codes are the weakest, since SIM swaps let an attacker steal your phone number and receive them. TOTP authenticator codes — the 30-second kind — are computationally strong: nothing is transmitted, an offline attacker cannot derive them, and each expires in seconds. Hardware security keys and passkeys are strongest of all, because they are phishing-resistant and cryptographically bound to the real domain.

Because the password-only era collapsed. Industrial breaches exposed billions of credentials, automated credential-stuffing made hijacking accounts nearly free, and platforms got tired of paying for the aftermath. Regulators piled on — NIST deprecated SMS authentication in US standards, and the EU's PSD2 requires strong customer authentication. After a few giants normalized 2FA, every other service followed.

No. This is a browser-based 2FA tool: it runs on any laptop, tablet, or desktop with a modern browser, online or fully offline once installed as an app. It replaces the phone app whenever a phone is lost, sold, broken, out of battery — or simply not allowed where you work.

Yes. Every calculation happens locally in your browser with the Web Crypto API. Your secret keys are never sent to — or seen by — any server. You can load the page, disconnect from the internet, and the generator keeps working.

Absolutely. Install 2FA COUNTER as an app (Add to Home Screen / Install) and it runs completely offline like a native authenticator. Codes are derived from your secret plus your device clock — no network needed.

Almost always clock drift. TOTP codes are time-based, so if your device clock is off by even half a minute the code is invalid. Make sure your system time is set to sync automatically (e.g. Windows “Sync now” in date & time settings, macOS “Set date & time automatically”) and try again. The generator computes against the time your device reports — it has no clock of its own to fix.

They are phone apps; this is a browser authenticator. It uses the exact same RFC 6238 TOTP algorithm and works with every service that accepts a standard authenticator app — but you never lose access because a phone is broken, sold, or out of battery.

Only in your own browser. Your last key plus a short “Saved keys” list (up to 8) are kept in this device’s local storage so the generator survives a refresh and you can switch keys in one click — never on our servers, because there aren’t any. The keys are stored as plain text, so anyone who can open this browser profile can read them — treat the profile like a password-manager vault. The “Clear all” button above the list (it asks you to confirm), clearing the input field, or wiping your browser data removes them for good; keep the original secret in your password manager as the master copy.

Yes. Paste the full otpauth:// URI your service provides and every parameter it carries is honored automatically — 6, 7 or 8 digits, 15/30/60 s period, SHA-1/SHA-256/SHA-512 hashing, and counter-based HOTP. A bare Base32 key uses the standard defaults (6 digits, 30 s, SHA-1), which is what almost every service uses.

Yes — no accounts, no premium tier, no login. It is a tool, not a service.