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Open zas.red and you can send immediately. Zas creates an anonymous session for you.
The web address is the credential. Anyone who has that address has the session. There is no password to add and no way to recover it if you lose the address.

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What an anonymous session gives you

An empty session does not stick around. If you open Zas, send nothing, and leave, the session is deleted after 30 minutes.

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Move the session to another device

Every anonymous session shows a QR code. Scan it with the second device and that device joins the same session. No account, no typing. Use this for a print shop, a hotel computer, or a machine you do not own. You never sign a real account into that machine.

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Sign in and keep everything

Signing in converts the anonymous session into your account. Nothing re-uploads. Nothing is lost. The items you already sent stay where they are and pick up the account limits.

Sign in

Google, Apple, or an 8-digit email code.

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On phones and tablets

The iPhone, iPad and Android apps always use an account. They do not offer anonymous sessions. Anonymous sessions are a web feature, because the web is where you land on a machine that is not yours.