How the syllables are built
Each block is consonant + vowel + consonant: bad, vuk, zet. With 16 consonants and 5 vowels that's 16 × 5 × 16 = 1,280 equally likely syllables, or log2(1,280) ≈ 10.32 bits each. The generator groups syllables into chunks so they read like names (Kopsed, Tajmur), which doesn't change the maths.
Unlike older "pronounceable" generators that follow English letter-frequency patterns, every syllable here is uniform. That makes the entropy exact instead of an estimate.
How many syllables?
Prefer real words? The passphrase generator uses the EFF diceware list, and the passphrase vs password guide compares the approaches.
Questions
What is a pronounceable password?
A password built from syllables you can say, like "Vobtez-Kaznum-Rigdup7", rather than words from a dictionary. It sounds like an invented name, which makes it easier to read out, type and remember than a random character string.
Is a pronounceable password weaker than a random string?
Per character, yes: each three-letter syllable carries 10.3 bits, about 3.4 bits per letter, versus about 6.6 bits per character for fully random letters, digits and symbols. You make up for it with length. Eight syllables plus a digit is about 86 bits, more than a random 12-character password (about 79 bits).
Why are some letters missing?
The generator uses 16 consonants and 5 vowels. It leaves out c, q, x (ambiguous sounds) and l and y (easily confused with 1, I or vowels) so a password read aloud is typed the same way.
Pronounceable password or word passphrase?
Word passphrases are easier to memorise, because real words carry meaning. Pronounceable passwords are shorter for the same strength and avoid dictionary words, which helps on sites with low maximum lengths.