2FA / TOTP Code Generator

What is a TOTP / 2FA code?

A TOTP (Time-based One-Time Password) is a short numeric code that changes every 30 seconds and is used as the second factor in two-factor authentication. Both the server and your authenticator app share a secret key and combine it with the current time to derive the same code — no internet connection required.

This tool reproduces that calculation in the browser. Paste the Base32 secret you were given during 2FA setup (the text shown under the QR code) and it generates the current 6-digit code along with a live countdown to the next one.

How it works

• Implements RFC 6238 TOTP with HMAC-SHA1, a 30-second period and 6-digit output
• Compatible with Google Authenticator, Authy, Microsoft Authenticator and 1Password
• Runs 100% client-side using the Web Crypto API — your secret is never transmitted or stored
• Live countdown bar shows exactly when the code refreshes

Common uses

Developers use it to test TOTP integration without installing an app, support teams use it to verify enrollment flows, and power users keep a backup way to read codes from a secret they have saved securely. Treat the secret like a password — anyone with it can generate your codes.