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

# What is Master Password?

> Learn about the importance of your Master Password and how to change it to protect your Vault

## What is Master Password?

**Master Password** is the only decryption key that unlocks your data Vault. It is the **ONLY** password you need to remember, and you are the **ONLY** person who knows it.

A strong Master Password should meet these requirements:

* At least **12 characters** long.
* Includes **uppercase letters**, **lowercase letters**, **numbers**, and **special characters**.

<Note>
  Having trouble creating a strong password? Try the Locker [Password Generator](https://locker.io/password-generator).
</Note>

### Tips to avoid losing data if you forget your password

Because Locker uses a **zero-knowledge** security model, we cannot recover your password for you. Consider the following precautions:

* **Set up a password hint:** Locker will send an email containing your hint to help you recall your password.
* **Add an emergency contact:** Users on the [Premium](https://locker.io/plan) plan can grant a trusted contact access to their Vault in case of an emergency.

***

## Change your Master Password

You can change your Master Password at any time as long as you still remember your current one.

<Tabs>
  <Tab title="On Web Vault">
    <Steps>
      <Step title="Open Settings">
        In the Locker Web Vault, click **Settings** in the left navigation bar.
      </Step>

      <Step title="Select Change Password">
        On the **Account** page, click the `Change Password` button (next to the `Edit Info` button).
      </Step>

      <Step title="Enter your information">
        The system will navigate you to the password change page. Enter:

        * **Current password**
        * **New password**
        * **Confirm new password**
      </Step>

      <Step title="Complete the change">
        Click `Save Changes`. The system will automatically log you out, and you will need to log back in with your new password.
      </Step>
    </Steps>
  </Tab>

  <Tab title="On Mobile">
    <Steps>
      <Step title="Open Settings">
        In the Locker app, tap the `Menu` tab > select `Settings`.
      </Step>

      <Step title="Go to Account">
        Under the **Account** section, tap `Change Master Password`.
      </Step>

      <Step title="Confirm the change">
        Enter your **Current password**, **New password**, and **Confirm new password**. Then tap `Save`.
      </Step>

      <Step title="Log back in">
        After saving successfully, you will be logged out of the current session. Log back in to continue using Locker.
      </Step>
    </Steps>
  </Tab>
</Tabs>

***

## Forgot your Master Password?

If you have forgotten your Master Password and cannot log in, refer to the recovery guide here:
[What should I do if I forgot my Master Password?](/en/locker-general/login-unlock/i-forgot-my-master-password)