# How to use a 2FA secret and online decoders safely

> A 2FA secret generates valid one-time codes and is therefore the key to the second factor. For ongoing use, keep it in a trusted authenticator app on your device instead of pasting it into a website.

## The service named by AccsMarket

AccsMarket directs buyers to 2fa.live: a user pastes a TOTP secret and receives a six-digit code that lasts about 30 seconds. It is a third-party site, not owned by ProAccs; the submitted secret could potentially be observed by the site operator, its scripts, or a malicious browser extension.

## The safer option

Add the secret only to a trusted authenticator app on your own device and, after confirming control, replace the transferred secret with your own where the platform permits. Never share the secret, QR code, backup codes, or current one-time code.

## Base64Decode.org

The service decodes Base64 and says its UTF-8 real-time mode runs in the browser, while uploaded files are processed on its server and later deleted. It can be used for non-secret sample text, but not for tokens, cookies, TData, session files, passwords, or order data.

## What a converter cannot do

Base64 decoding only restores the original bytes; it does not decrypt data or convert TData, Session, JSON, and cookies into one another. Unknown Telegram converters and bots can capture an active session, so ProAccs does not recommend them.

## Related

- [What 2FA means and how to enable it safely](https://getproaccs.com/en/docs/two-factor-authentication)
- [Cookie, JSON, and Base64: the difference](https://getproaccs.com/en/docs/cookies-json-and-base64)
- [Telegram TData, Session, and JSON formats](https://getproaccs.com/en/docs/telegram-session-formats)
- [Safe first inspection of a digital account](https://getproaccs.com/en/docs/first-access-security)

## Sources

- [AccsMarket guide to 2fa.live](https://www.accsmarket.com/en/2fa-two-factor-authentification)
- [2fa.live](https://2fa.live/)
- [Base64Decode.org](https://www.base64decode.org/)
- [RFC 6238: TOTP](https://www.rfc-editor.org/rfc/rfc6238)
- [RFC 4648: Base64](https://www.rfc-editor.org/rfc/rfc4648)

Canonical: https://getproaccs.com/en/docs/using-2fa-and-converters
Updated: 2026-10-11