Passphrase vs Password: Which Is Stronger? (Miễn phí Tool)

A passphrase là several random words strung together, like walnut-ferry-tidal-oxygen-clamp-violin. A mật khẩu là a string of random characters, like q7#Vd!m2Kp@x. Both có thể be equally strong: six random words từ a big word list carry about same strength as 12 random characters. Dùng random-character passwords từ free password generator cho anything a mật khẩu manager fills in, và a passphrase cho few things bạn must remember hoặc type by hand.

The key word in both cases là random. A passphrase bạn choose yourself, like a song lyric, là weak; a passphrase picked by dice hoặc software là strong.

The quick comparison

	Random mật khẩu	Random passphrase
Looks like	q7#Vd!m2Kp@x	walnut-ferry-tidal-oxygen-clamp-violin
Strength comes từ	Many possible characters per position	Many possible words per position
Typical strong length	16-20 characters	6-7 words
Easy đến remember?	No	Fairly
Easy đến type on a phone hoặc TV remote?	No, lots of symbol switching	Yes, mostly lowercase letters
Accepted everywhere?	Almost; some sites cap length hoặc ban some symbols	Some sites cap length below a long phrase
Best cho	Everything stored in a mật khẩu manager	Manager master mật khẩu, computer login, Wi-Fi bạn type often

Cách strength là measured

Strength là counted in bits of entropy: each bit doubles số of guesses an attacker might need.

• A random character từ generator's 85-character set (letters, digits và 23 symbols) adds about 6.4 bits.
• A random word từ a list of 7,776 words ( size of widely used diceware lists, where five dice rolls pick each word) adds about 12.9 bits.

So one random word là worth about two random characters. Some equivalents:

Passphrase	Bits	Similar random mật khẩu
4 words (7,776-word list)	about 52	8 characters (about 51 bits)
5 words	about 65	10 characters (about 64 bits)
6 words	about 78	12 characters (about 77 bits)
8 words	about 103	16 characters (about 103 bits)

The maths only holds nếu each word là picked at random từ whole list. Nếu bạn pick words yourself, bạn'll pick common, related words, và attackers' tools try exactly those combinations first. A smaller list also means fewer bits: với 2,000 words, each word adds about 11 bits.

For a sense of what these bit counts mean in time, see how long it takes to crack a password.

Where passwords win

• Inside a mật khẩu manager. You never type hoặc remember them, so make them long và fully random. 20 characters từ all four character types là about 128 bits, far beyond any passphrase bạn'd want đến type.
• Sites với short length limits. Some older sites cap passwords at 16 hoặc 20 characters. Random characters pack more strength into fewer characters.
• API keys, service accounts và shared secrets. Machines don't care about memorability.

Where passphrases win

• Your mật khẩu manager's master mật khẩu. It's one bạn must remember, và it protects everything else. Six hoặc seven random words là a good target.
• Your computer hoặc phone login, nếu bạn use a mật khẩu there rather than a PIN hoặc fingerprint.
• Anything typed on an awkward keyboard: smart TVs, trò chơi consoles, a Wi-Fi mật khẩu guests type in by hand.
• Something bạn must read aloud, where quartz-lemon-harbor survives a phone call better than q7#Vd!m2.

As per NIST SP 800-63B (revision 4, 2025), long passwords và passphrases là welcome, sites should allow spaces và at least 64 characters, và shouldn't force composition rules hoặc regular changes. Some sites still demand a capital, a digit và a symbol. Add them in one predictable place, such as Walnut-ferry-tidal-oxygen-clamp-violin-7. That doesn't add much strength, but it satisfies rule without weakening random words.

Cách đến make each one

A random mật khẩu: open free password generator, set Length (it starts at 20 và goes từ 8 đến 128), keep Lowercase, Uppercase, Numbers và Symbols ticked, press Generate, then Copy. It's created on của bạn device và never sent anywhere.

A random passphrase: mật khẩu generator makes character passwords only; it doesn't pick words. Two ways đến get a random passphrase:

1. Dice. Dùng a published diceware word list và roll five dice cho each word. Each roll picks one word từ 7,776. It's slow but completely offline.
2. Our random picker. Mở free random number generator, choose Pick từ a list, paste a long word list (one word per line, longer better), set Cách many đến pick đến 6 và press Pick. It uses của bạn browser's secure random source, và nothing là uploaded. Join words với hyphens hoặc spaces.

Whichever bạn choose, don't edit result into something "nicer". Swapping a random word cho a favourite one là how strength leaks away.

Common myths

"Passphrases là always stronger because they're longer." Length in letters doesn't matter; số of random choices does. correcthorsebattery là 19 letters but only 3 random words, about 39 bits từ a 7,776-word list, weaker than a random 8-character mật khẩu.

"Replacing letters với symbols makes it strong." P@ssw0rd là one of first guesses any cracking tool makes. Swaps like a→@ và o→0 là well known.

"I'll hash my mật khẩu first đến make it random." Hashing a weak mật khẩu gives a long string, but an attacker who guesses của bạn method có thể hash same guesses. The free hash generator là cho checksums, not cho making passwords.

For a full routine, including how long a mật khẩu should be cho each kind of account, read how to create a strong password.

Generate one now

For every account của bạn mật khẩu manager handles, a random 16-20 character mật khẩu là strongest, simplest choice. Make one với free password generator, copy it straight into của bạn manager, và save passphrases cho handful of things bạn type yourself.