Passphrase Generator
Four or five random words are easier to remember than a jumble of characters, and a longer passphrase is harder to guess.
このコンテンツは英語です。
計算例
Four word passphrase
Four words, no number added
Four random words from a list of 1,091 common English words, joined with separators, with an estimated strength of about 40 bits.
Each word adds about 10.1 bits, so four words give about 40 bits; the words themselves change on every click.
Six word passphrase with a number
Six words with a two-digit number added
Six random words and a two-digit number, with the estimate counting the bits from the word choices and the number.
Adding more words raises the estimate faster than adding digits, so a longer passphrase is usually the better choice.
Passphrase Generator について
A passphrase is a string of random words, such as four common words joined by hyphens, that is easier to remember than a jumble of letters and symbols yet still hard to guess. This generator picks each word at random from a list of 1,091 common English words, so every word adds the same amount of strength. You choose how many words to use, which separator to place between them and whether to capitalise the words or add a two-digit number. The result comes with an estimate of its strength in bits, which makes options easy to compare.
Length matters more than complexity for a passphrase. Each word adds about ten bits of strength, so four words give roughly forty bits and six words roughly sixty. The estimate counts the random word choices and, if you add one, the two-digit number. Use a passphrase for a password manager master key, for a phone or laptop you unlock often, or for an account that matters a great deal. Generate a new one each time rather than reusing an old one, and remember that the estimate assumes the method and word list are known to a guesser.
Passphrase Generator の使い方
- Choose how many words you want, from three to twelve. Four or more is a good start.
- Pick a separator, such as a hyphen, and decide whether to capitalise the words.
- Tick the two-digit number option if you want an extra number on the end.
- Copy the passphrase, then check the estimated strength before you use it.
主な使いみち
- Creating a master passphrase for a password manager
- Choosing a long unlock code that is easy to type and remember
- Making a shared family account passphrase that does not need writing down
- Replacing a weak password with a longer random one
よくあるご質問
How many words should I use?
Four words give about forty bits of strength and six words about sixty, so for anything important aim for at least five or six. A password manager master passphrase is a good place to use six or more. For a phone or tablet you unlock many times a day, four words with a number may be enough, as long as you do not reuse the same words anywhere else.
What does the strength estimate mean?
Bits measure how many guesses would be needed to find the passphrase, if the method and the word list were already known. Each extra bit doubles the number of guesses. The estimate counts each random word and the optional number, but not capitals or separators, because those are fixed choices that do not change the odds. It is a guide to comparing options, not a guarantee.
Can I use a passphrase where the site limits length?
Some sites set a maximum length or reject spaces. If that happens, choose the hyphen or no separator, use fewer words, and drop the number if the limit is tight. Check the site's rules first. A passphrase of four or five words usually fits within common limits, and you can paste it straight into the password box.
Why does the list have 1,091 words?
A list of common, short English words is easy to remember and easy to type. Each word is picked at random from the whole list, so the number of possible passphrases is very large. The number of words and the size of the list together set the strength, which is why the tool shows both the bit estimate and the number of words to choose from.
Should I write a passphrase down?
Writing a passphrase on paper can help, as long as you keep the note somewhere only you can reach and not in the same place as the thing it unlocks. Many people find a memorable passphrase easy to recall after a few uses. Copy it into your password manager or write it down before you leave the page, because the passphrase will not be shown again after a refresh.