As an administrator, go to Site Administration | Users | Accounts | Upload users:

Add a CSV (comma delimited) file to upload. Each row represents an entry. The topmost row specifies the categories (per column) involved. Here and the fields and data for the ff example:

username,password,firstname,lastname,email
jdelacruz, 1JDsecret, Juan, De la Cruz, [email protected]

You may also specify roles and courses the users have to be enrolled in:

username,password,firstname,lastname,email,role1,course1
jdelacruz, 1JDsecret, Juan, De la Cruz, [email protected],teacher,mathintro

Tips

• In field information, avoid special characters like quotes ("") and ň
• A CSV file can be had from a list on Excel (or any Spreadsheet) by doing “Saved as” and choosing CSV format.
• Use alphanumeric character combination (capital, number, small letter, special character) for a password.
• Check settings and default user profile settings. Adjust these settings, only if you're absolutely sure about the need.
• Additional fields like cohort and course may be added for convenience.

For most cases, you don't need to adjust anything here.

An alternative to this approach is by bulk-enrollment-of-students using their registered email addressed.