Skip to content
ToolsOnDuty - free online tools
Security & Cryptography

TOTP 2FA Code Generator

Generate time-based one-time passcodes from a Base32 secret.

Free foreverRuns in your browserNo sign-up

Generates time-based one-time passwords (TOTP, RFC 6238) like an authenticator app, using HMAC-SHA1. Everything runs in your browser and the secret is never uploaded.

About the TOTP 2FA Code Generator

Generate time-based one-time passcodes (TOTP) from a Base32 secret, just like an authenticator app.

The code refreshes every period and a countdown shows how long it is valid, so you can read or copy it in time.

Everything runs in your browser using HMAC-SHA1, so your secret is never uploaded.

Key features

  • Live TOTP codes with a countdown
  • 6 or 8 digits, 30 or 60 second periods
  • Standard RFC 6238 algorithm
  • Runs entirely in your browser

How to use

  1. 1Paste your Base32 secret key.
  2. 2Choose the digits and period if needed.
  3. 3Read or copy the current code before it refreshes.

Examples

Generate a code
Input: Base32 secret
Output: A 6-digit code with a countdown

The code matches what an authenticator app would show.

Longer codes
Input: 8 digits, 60 seconds
Output: An 8-digit code valid for 60 seconds

Some services use longer codes or periods.

Frequently asked questions

Where do I get the Base32 secret?
When you set up 2FA, the site shows a secret key (or QR code) in Base32. Paste that secret here.
Why does the code keep changing?
TOTP codes are time-based and refresh every period (usually 30 seconds), which is what makes them one-time.
Is my secret uploaded?
No. Codes are computed entirely in your browser and the secret is never sent anywhere.

Related tools