HOTP Generator
Generate a counter-based code using your existing setup key. HOTP uses a counter rather than the current time.
Use an existing setup key, or try the demo.
Advanced settings
Use the settings supplied by your service. Authenticator apps may not support every option.
Your result will appear here
Your setup key stays in this tab. Read the security notes
More 2FA tools for your next task.
Choose a tool for a code, QR image, or setup link.
2FA code generator
Generate a time-based code from your authenticator setup key.
Open SETUP2FA QR code generator
Build an authenticator QR code from your setup details.
Open DECODE2FA QR code reader
Read an authenticator QR image locally in your browser.
Open VALIDATEotpauth URI validator
Inspect a setup link and check its parameters.
OpenBefore you use
an online authenticator.
A setup key can generate future codes. Keep it private, just as you would a password.
Need a hand?Use the correct counter
Enter the counter expected by your account or test implementation. Increasing it without signing in may move your generator ahead of the service. Do not guess repeatedly on a live account.
HOTP or TOTP?
If your authenticator displays a timer and changes its code automatically, you probably need the TOTP tool instead. Check the original setup instructions when you are unsure.
Limits of this tool
Generating a code does not advance a remote service’s counter. This page cannot check an account’s counter or reset its authentication settings.