If you need to create a secure password, but do not have a desktop application at hand to do that for you, nor the desire to create a random password by yourself, then the Ultra High Security Password Generator web service may be exactly what you are looking for.
Every time you visit or refresh the website it will display three randomly generated passwords, one 64 random hexadecimal characters password, one 63 random printable ASCII chars and finally a 63 random alpha-numeric characters password.
Keep in mind that those passwords may be too complex for a lot of services and programs. Some websites for instance limit the number of available characters that you can use for your user password. If you exceed that limit, you can't use the selected password, or change your existing one to it. Not only the length may get you into troubles though, as many sites prohibit the use of certain characters so that you may not be able to use the second password, the random ASCII character one, on those sites.
Every one is completely random (maximum entropy) without any pattern, and the cryptographically-strong pseudo random number generator we use guarantees that no similar strings will ever be produced again. Also, because this page will only allow itself to be displayed over a snoop-proof and proxy-proof high-security SSL connection, and it is marked as having expired back in 1999, this page which was custom generated just now for you will not be cached or visible to anyone else.
Just one hint, make sure you save the password somewhere because I think it's rather difficulty to remember the passwords. You might want to consider using a password safe like Keepass which I also recommended here at Ghacks some time ago. Then again, KeePass comes with its own password generator that you can customize exactly the way you want to. You can for instance select the number of characters for the password, as well as whether it should include numbers, upper and lower case, or special characters.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.