# 2FA.CN

> 2FA.CN is a free online two-factor authentication tool for generating Time-based One-Time Password (TOTP) verification codes directly in a web browser.

## About

2FA.CN provides an online authenticator for users who need to generate temporary verification codes for accounts and services that support TOTP-based two-factor authentication.

The service is designed to be simple, fast, and accessible without requiring users to install a dedicated authenticator application.

2FA.CN supports standard TOTP authentication workflows and can be used with services that provide a compatible TOTP secret key or QR code.

## Main Features

- Online TOTP code generation
- Two-factor authentication code generation
- OTP verification code generation
- QR code based TOTP setup
- Manual secret key input
- Multiple TOTP account support
- Browser-based authentication
- Mobile and desktop support
- RFC 6238 compatible TOTP generation
- Local browser-based processing

## Common Use Cases

Users can use 2FA.CN for TOTP-enabled accounts and services, including:

- Google accounts
- Microsoft accounts
- GitHub
- GitLab
- Amazon Web Services
- Discord
- Facebook
- Instagram
- X
- Dropbox
- Steam
- PayPal
- Cryptocurrency platforms
- Other services supporting standard TOTP authentication

## Security

2FA.CN is designed to process TOTP information in the user's browser.

Users should only enter authentication secrets into services they trust and should never share their secret keys with other people.

Two-factor authentication secrets are sensitive security credentials and should be protected accordingly.

## TOTP Standard

2FA.CN is based on the Time-based One-Time Password algorithm described by RFC 6238.

TOTP generates a temporary verification code from a shared secret and the current time.

The generated code changes periodically according to the configured time interval.

## Documentation

Website:
https://2fa.cn/

## Important Security Notice

2FA.CN is an online authentication utility. Users are responsible for protecting their authentication secret keys and recovery information.

Do not enter authentication credentials or secret keys into websites that you do not trust.

## Content Scope

This website focuses on:

- Two-factor authentication
- Multi-factor authentication
- TOTP
- OTP
- Authenticator tools
- Authentication security
- Online security utilities
- Authentication troubleshooting