The Steam self locking tool allows you to lock your account and protect it from unauthorized actions if you suspect that the account has been stolen or compromised.
Locking your account is simple. When certain Steam account changes are made, a notification will be sent to the email address that is associated with your account. These include the following:
In these various notification emails you will find a link to lock your account. Once clicked, you will be taken to a page to complete the process. Even if your email address is changed on your Steam account, you will still receive an email with a lock link confirming the action.
When locking an account, please ensure that you write down the provided unlock code. Once the account has been secured, this code can be used to remove the restrictions.
At this time you can only lock your account from the link that can be found in the associated email notifications above. You cannot lock your account from directly within the Steam client or any other location.
If possible, please use Steam's Account Recovery tools to revert any unauthorized changes.
If you are unable to sign in to the account, you must contact Steam Support. A Support tech will verify that you are the owner of the account and restore full access to you. When submitting this message to Steam Support, please make sure that you include the account's login name and appropriate valid proof of ownership.
If you believe your account is secure, you can use the "unlock my account link" from your self-lock confirmation email to initiate the unlock process.
The lock that is applied to your account restricts all major actions that can impact you and other Steam users. These include the following: