Local generation
The TOTP calculation happens in the browser using Web Crypto instead of posting your secret to a backend endpoint.
Your 2FA code. Instantly. Privately.
Paste a TOTP secret and get the current verification code in seconds. No account, no upload, no server-side secret storage.
RFC 6238 TOTP
Auto-refresh
Multiple keys
Works on mobile
2FA / TOTP Code Generator
One Base32 secret or otpauth://totp link per line.
Your generated code will appear here with a live countdown.
Privacy note: Fast2FA computes TOTP codes with your browser's Web Crypto API. Secrets are not intentionally stored in localStorage or sent to an application server. Use a trusted device and close the tab when finished.
Built for the job, without the clutter
A focused TOTP utility should make the sensitive action obvious, fast, and easy to verify.
Live 30-second timer
See exactly when the current code expires, then receive the next code automatically without resubmitting.
Batch-friendly
Generate multiple independent TOTP codes in one view while keeping every secret hidden by default.
otpauth support
Paste a standard TOTP enrollment URI and Fast2FA reads the issuer, label, algorithm, digits, and period.
Responsive UI
Large tap targets, clear code typography, and a one-column mobile layout make quick sign-ins easier.
No secret vault
This tool is intentionally not a password manager. Clear everything with one click after you finish.
How to generate a 2FA code
Use this only with a TOTP secret that belongs to an account you are authorized to access.
Copy the TOTP secret
Get the Base32 secret from the service's two-factor authentication setup screen or your own secure backup.
Paste it into Fast2FA
The secret stays masked by default. You can also paste a standard otpauth://totp link.
Copy the current code
Use the displayed code before the countdown reaches zero. It refreshes automatically for the next period.
2FA generator FAQ
Important details about browser-based TOTP generation.
What is a TOTP code?
TOTP is a time-based one-time password derived from a shared secret and the current time. The common algorithm is specified by RFC 6238.
Does Fast2FA save my 2FA secret?
The application code does not write TOTP secrets to localStorage, cookies, or a backend database. The secret exists in the current page while you use the tool, so use a trusted browser and device.
Why does the code change?
Most TOTP configurations use a 30-second period. When that time window changes, the generated one-time password changes too.
Can I generate several 2FA codes?
Yes. Put one Base32 secret or TOTP URI on each line. Fast2FA can display up to 25 codes at once.
Is an online TOTP tool the best place to store secrets?
No. Fast2FA is a temporary utility, not a vault. For regular use, prefer a dedicated authenticator or reputable password manager with protected TOTP storage.