The most commonly used passwords are alphanumeric, including both upper and lower case letters, on most systems. Most systems limit the length of passwords to 8 characters, but there are cases of legal passwords with many more than that as legal. There are instances where some very high security systems include spaces (the character generated by the space bar) in a password. We are not using any of them in the pre-designated sets but you may include them by placing the s character where you want to POSSIBLY have a space. That position will be the characters from the Other Characters plus the space. The value will be chosen from that set randomly and it is POSSIBLE to have a space in that position. We suggest only one per password, not the leading or ending character. (While we provide the option, we do NOT suggest using spaces.) To clear the entries in the created password box and the mask box, click on Clear Values. If you would like to determine the odds on cracking a password, please try our Password Possible Options Calculator.