2FA FAQ – Security, Privacy & Usage | 2fa.cn

1. Is 2fa.cn safe to use?

Yes. 2fa.cn is designed with security as the top priority.

All OTP and TOTP codes are generated locally in your browser, which means sensitive information never leaves your device.

We follow industry-standard authentication specifications and ensure the website is served over HTTPS at all times.

2. Do you store my secret keys, OTP codes, or account data?

No. 2fa.cn does not store any secret keys, OTP codes, or personal data.

All code generation happens on the client side, and no information is transmitted to or saved on our servers.

3. Is the 2FA code generation done locally or on your servers?

All code generation is done entirely on the client side (in your browser).

Our servers never see your secrets, seeds, or generated authentication codes.

4. Do you log user activity or usage data?

No. 2fa.cn does not log individual user activity related to OTP generation.

We may collect minimal, anonymous technical metrics (such as page load performance) solely to improve site reliability.

5. How does the 2FA generator work?

2fa.cn generates one-time passwords (OTPs) based on standard algorithms such as TOTP (Time-based One-Time Password).

You enter your secret key, and the browser calculates a temporary code that refreshes automatically based on time intervals.

6. What is the difference between TOTP and HOTP?

TOTP generates codes based on the current time and expires every 30 seconds.

HOTP generates codes based on a counter that increments after each use.

Most modern authentication apps and services use TOTP, which is fully supported by 2fa.cn.

7. Is 2fa.cn compatible with Google Authenticator and similar apps?

Yes. 2fa.cn is compatible with Google Authenticator, Microsoft Authenticator, Authy, and other RFC-compliant 2FA apps.

If a service supports standard TOTP, it will work with 2fa.cn.

8. Which standards does 2fa.cn support?

2fa.cn supports widely adopted authentication standards, including:

• RFC 6238 (TOTP)
• RFC 4226 (HOTP)

This ensures compatibility with most platforms and services that use two-factor authentication.

9. Is 2fa.cn free to use?

Yes. 2fa.cn is completely free to use and does not require registration or account creation.

10. Who maintains 2fa.cn?

2fa.cn is maintained by a team focused on authentication, account security, and online privacy tools.

Our goal is to provide simple, transparent, and reliable security utilities for developers and everyday users.

11. Can I use 2fa.cn for commercial or enterprise purposes?

Yes. You may use 2fa.cn as a utility tool for development, testing, or personal workflows.

However, for large-scale or enterprise deployments, we recommend implementing a dedicated authentication solution within your own infrastructure.

12. Is 2fa.cn open source?

At this time, 2fa.cn is not fully open source.

However, the platform follows open authentication standards, and transparency around security and privacy is a core design principle.