expires in: sec

Get one-time time-based passwords with 2FA OTP Authenticator.

Make sure your device has the correct date and time.

2FA OTP Authenticator

About Online 2FA OTP Authenticator

2FA (Two-Factor Authentication) OTP (One-Time Password) Authenticator are security tool that add an extra layer of protection to your accounts and sensitive information. When using 2FA, even if someone has your password, they won't be able to access your account without the second factor, which is typically a time-based OTP.

This Online 2FA OTP Authenticator app, like Google Authenticator, Authy or Microsoft Authenticator, generates short-lived, time-based codes (usually six digits) that you enter after your password during login. This ensures that even if your password is compromised, unauthorized users can't access your account without the OTP, making it much more secure.

A browser-based TOTP generator for two-factor authentication. Paste a base32 secret or otpauth URI to create 6-digit codes for popular services.

Using 2FA with OTP is highly recommended for online accounts, financial services, and any platform where security is critical. You can use it for Google and Microsoft accounts, Facebook, Amazon, Dropbox, LinkedIn, GitHub, and more.

Based on JS-OTP

2FA OTP Authenticator: Generate Time-Based One-Time Passwords Online

2FA OTP Authenticatorcreates time-based one-time passwords (TOTP) for two-factor authentication. Use it to add a second step to logins across popular services and developer stacks.

What this tool does

  • Generates 30-second rotating codes compliant with TOTP (RFC 6238) using your secret key.
  • Works in the browser. No account, no installation.
  • Useful for testing 2FA flows, backup access, staging environments, and developer demos.

How TOTP works (quick)

TOTP combines a shared secret (base32) and the current time to compute a 6-digit code. The server and your authenticator both compute the code; a match proves possession of the secret and the correct time window.

How to use the online authenticator

  1. Get your secretfrom the service you’re enabling 2FA on (QR or base32 string likeJBSWY3DPEHPK3PXP).
  2. Enter the base32 secretin the tool or paste theotpauth://URI.
  3. Optionally setissuer,account name, digits, and time step (default: 6 digits, 30 s).
  4. Copy the current code and complete verification on the target service.

Why use this vs. a mobile app?

  • Speed: instant codes in any desktop browser for QA and CI checks.
  • Visibility: inspect parameters, test drift, and edge-case windows.
  • Portability: no device pairing required for temporary environments.

Security notes

  • Protect your secret. Anyone with the base32 key can generate valid codes.
  • Use HTTPS onlyand keep the page private. Clear the secret after use.
  • Time accuracy matters. Ensure your device clock is synced (NTP). Even small drift can invalidate codes.
  • Backup: store recovery codes from the destination service. The tool cannot recover lost secrets.

Compatibility

Supports standard TOTP used by Google, Microsoft, GitHub, AWS, Cloudflare, Slack, GitLab, and most OAuth/OpenID providers. HOTP (counter-based) is not supported unless specified by the service.

Common parameters

FieldDefaultNotes
Digits6Some services allow 8.
Period30 s60 s exists but is rare.
AlgorithmSHA-1SHA-256/512 supported by some IdPs.
URIotpauth://totp/Issuer:Account?secret=...&issuer=...&period=30&digits=6Paste this to auto-fill.
Developer tips
  • Verify server and client periods match. Allow ±1 window to tolerate clock skew.
  • Base32 secrets should be uppercase without spaces. Strip=padding if present.
  • When testing QR, decode to theotpauth://URI to confirm parameters.
FAQ
Is this a replacement for Google Authenticator/Authy?
No. It is a lightweight, browser-based generator for quick use and testing.
Do you store my secrets?
No. Code generation runs locally in your browser. Clear the page to remove inputs.
Why do my codes fail?
Check the secret, digits, algorithm, and system time. Ensure no trailing spaces and correct base32.
Can I generate multiple tokens?
Yes. Open multiple instances or profiles, each with a different secret.

Next step:Paste your base32 secret orotpauth://URI, confirm time sync, and use the displayed code to complete 2FA.

Standards: TOTP per RFC 6238, HOTP per RFC 4226 (concept reference).