> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zas.red/llms.txt
> Use this file to discover all available pages before exploring further.

# Sign In to Zas with Google

> Sign in to Zas with Google. Keys derive from your sign-in via OPRF. No recovery phrase. Use a machine you own, or start an anonymous session instead.

Zas uses Google sign-in as its only authentication method. Your encryption keys are derived from your sign-in through OPRF (Oblivious Pseudo-Random Function). There is no password to remember and no recovery phrase to store.

## How to sign in

<Steps>
  <Step title="Open zas.web">
    Go to [zas.web](https://zas.web) and tap **Sign in with Google**.
  </Step>

  <Step title="Choose your Google account">
    Select the Google account you want to use. This becomes your Zas identity.
  </Step>

  <Step title="Start sending">
    Once signed in, your feed loads and you can send items immediately.
  </Step>
</Steps>

## No recovery phrase

Zas does not use a recovery phrase. Your keys are tied to your Google sign-in. If you lose access to your Google account, you lose access to your Zas account. Keep your Google account secure.

## The WhatsApp Web QR problem

Signing in on a machine you do not own, like a print-shop computer, exposes your full account. Zas solves this with anonymous sessions. On an untrusted machine, choose **Continue without account** instead. Your items stay portable by QR, and you can convert the session to your account later without re-uploading anything.

<Warning>
  Only sign in on devices you trust. On public or borrowed machines, use an anonymous session.
</Warning>

## What to try next

* [Start an anonymous session](/en/getting-started/anonymous-sessions)
* [Compare all plans](/en/account/plans)
* [How privacy works](/en/concepts/privacy)