PostgreSQL starts with a superuser account named postgres, and it has no default password

When you install PostgreSQL on your own computer or server, the installation creates a system user called postgres with superuser privileges. This account exists to let you manage the database. However, PostgreSQL does not ship with a preset password for this account — the password is either blank, randomly generated during installation, or set by whoever ran the installer.

This matters because it changes how you connect. On a fresh installation, you typically connect to PostgreSQL without typing a password at all. The system uses your operating system login to authenticate you instead. If you installed PostgreSQL yourself and never set a password, trying to log in with a password will fail.

If you are renting database hosting from a provider like AWS RDS, DigitalOcean, or Heroku, they do assign a default password during setup and show it to you once. You must save that password when ready — most providers will not show it again. That password is specific to your hosted instance, not a universal PostgreSQL default.

Key Takeaways

  • PostgreSQL's superuser account is named postgres, but there is no universal default password across all installations.
  • On a local installation, you usually connect without a password by using your operating system login, not by typing credentials.
  • If you installed PostgreSQL yourself and do not remember setting a password, the account likely has no password set.
  • Hosted database services assign their own passwords during setup and display them only once, so save yours when ready.
  • Resetting a forgotten postgres password requires command-line access to the server where PostgreSQL is running.

How PostgreSQL authentication works on your own machine

PostgreSQL uses a file called pg_hba.conf to decide how to authenticate users. On most local installations, this file is configured to use peer authentication for the postgres user. Peer authentication means PostgreSQL checks whether your operating system user matches the database user — if you are logged in as the system user postgres, you can connect to the database as the postgres user without entering a password.

This is why you often see commands like sudo -u postgres psql in PostgreSQL documentation. The sudo -u postgres part switches you to the postgres system user, then psql connects to the database. PostgreSQL sees that your operating system user is postgres and lets you in without asking for a password.

If you try to connect as a different operating system user — say, your regular login — PostgreSQL will reject the connection unless you have explicitly set up a password for the postgres database user and changed the authentication method in pg_hba.conf to md5 or scram-sha-256.

Setting or resetting the postgres password on your own server

If you need to set a password for the postgres user on a server you control, you must have command-line access to that server. Log in as the system user postgres (or use sudo), then run the PostgreSQL command-line tool psql and execute an ALTER USER command.

The steps look like this: First, open a terminal and switch to the postgres user with sudo -u postgres psql. Then, at the PostgreSQL prompt, type ALTER USER postgres WITH PASSWORD 'newpassword'; (replace newpassword with your actual password). Finally, type \q to exit.

After you set a password, you will need to change pg_hba.conf to use password-based authentication instead of peer authentication if you want to log in from a different user account or from a remote machine. This is a separate step and requires restarting PostgreSQL.

Hosted PostgreSQL services and their default credentials

When you create a PostgreSQL database through a hosting provider, the provider generates a password for you during setup. AWS RDS, DigitalOcean Managed Databases, Google Cloud SQL, and similar services all follow this pattern: they show you the password once, usually in a confirmation screen or email, and do not display it again.

The default username is usually postgres or sometimes admin, depending on the provider. The password is random and unique to your instance. If you lose the password, you will need to use the provider's console to reset it — you cannot do it from the command line unless you have other administrative access to the server.

Some providers also let you create additional database users during setup or afterward through their web interface. These users have limited permissions and are often safer to use for applications than the superuser postgres account.

Why PostgreSQL does not ship with a universal default password

PostgreSQL intentionally avoids a hardcoded default password because it is a security risk. If every PostgreSQL installation came with the same password, anyone who knew that password could log in to any unpatched server on the internet. By requiring you to set the password yourself or using operating system authentication, PostgreSQL forces you to make a deliberate choice about access.

This design is common in server software. SSH, MySQL, and most database systems follow the same pattern: they either have no default password or require you to set one during installation. It is less convenient than a universal default, but it prevents a whole class of security breaches.

Connecting to PostgreSQL when you do not know the password

If you have command-line access to the server where PostgreSQL is running, you can always reset the postgres password using the steps in the "Setting or resetting the postgres password on your own server" section above. You do not need to know the old password to set a new one.

If you do not have command-line access — for example, you are renting a managed database service and lost the password — contact your hosting provider's support. They can reset it for you. Do not try to guess or brute-force the password; most PostgreSQL installations are configured to reject repeated failed login attempts.

Frequently Asked Questions

Is the default postgres password "postgres"?

No. PostgreSQL does not ship with a preset password. On a local installation, the postgres user typically has no password and uses operating system authentication instead. On hosted services, the provider generates a unique password during setup.

Can I connect to PostgreSQL without a password?

Yes, if you have command-line access to the server and you are logged in as the system user postgres. PostgreSQL will authenticate you using your operating system login. If you are connecting from a different user or from a remote machine, you will need a password.

What do I do if I forgot the postgres password on a hosted database?

Contact your hosting provider — AWS, DigitalOcean, Google Cloud, or whoever runs the service. They have tools to reset the password for you. You cannot reset it yourself without command-line access to the server.

How do I change the postgres password after I set it?

Log in as the postgres user (or use sudo) and run psql. Then execute ALTER USER postgres WITH PASSWORD 'newpassword'; and exit with \q. The new password takes effect when ready.

Should I use the postgres superuser account for my applications?

No. Create a separate database user with limited permissions for each process. The postgres superuser should be used only for administration. This limits the damage if an process is compromised or a password is leaked.