Here I would like to share 3 methods to reset SQL Server SA password if you forgot it. Help you unlock your locked SA account on SQL Server. When SA password is successfully reset do not forget it again.

1. 3 Methods to Reset SQL Server Forgotten SA Password
Forgot SA password and cannot connect to SQL Server? So you are locked out of
your SA account? Never mind! Here are 3 methods to reset SQL Server SA password.
Any one method can help unlock SQL Server SA account.
Method 1: By sa Login Properties
Log in to SQL Server Management Studio with Windows Authentication mode and
reset SQL Server SA password.
Step 1: Open SQL Server Management Studio.
Step 2: Login with Windows Authentication mode.
Step 3: In Object Explorer, expand the root folder. Go to Security -> Logins -> sa.
Step 4: Right click on the sa user. Select Properties.
Step 5: Select General page. Remove the unknown SA password and type a new
password. Click OK to save changes.
The SA password has been reset successfully. Then log in to SQL Server with the new
SA password.
Method 2: By Asunsoft SQL Password Geeker tool
Asunsoft SQL Password Geeker is third party software which can reset SQL Server sa
user or other users password within a few seconds. Install this software on your
computer then do as below:

2. Step 1: Stop SQL Services.
Step 2: Launch Asunsoft SQL Password Geeker.
Step 3: Click on Open File button.
Step 4: Browse for the SQL Server database file and import it into the software.
Tips: The SQL database file is generally located in D:Program FilesMicrosoft SQL
ServerMSSQL.1MSSQLDatamaster.mdf.
Step 5: Select the sa user and then click Reset button.
Step 6: Type a new sa password and click OK.
The SA password has been reset successfully and is visible. Remember it. Then close
the Asunsoft SQL Password Geeker. Start SQL Services. Then login to SQL Server with
the new sa password with SQL Server Authentication mode.

3. Method 3: By Query Window
Execute a simple command line in Query Window to reset SA password.
Step 1: Open SQL Server Management Studio.
Step 2: Loin with Windows Authentication.
Step 3: Click on New Query on the tool bar.
Step 4: Type sp_password Null, ‘NewPassword’, ‘sa’ in Query window. Click Execute.
You can see the message saying Command completed successfully. It proves SA
password has been reset successfully. Then login to SQL Server with the new sa
password.
If forgot SQL Server SA password and even cannot login with Windows
Authentication mode, download Asunsoft SQL Password Geeker to reset SA
password.