You can use the htpasswd command to create username and encrypted password for .htpasswd files.
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**__Note__:** **__NEVER__** user online tools to encypt passwords, this is **NOT** safe. 
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-c = Create the passwdfile. If passwdfile already exists, it is rewritten and truncated. This option cannot be combined with the -n option.
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== Updating file with new user ==
<sxh bash>
htpasswd /path/to/file/.htpasswd username
</sxh>
You will then be prompted to enter a password that will be encrypted
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== Creating new file ==
<sxh bash>
htpasswd -c /new/path/.htpasswd username
</sxh>
You will then be prompted to enter a password that will be encrypted