Wiktionary has the syllabication for most French words.
What are they?
Syllables are the smallest parts of words that have a continuous sound. They are made up from one vowel sound, plus associated consonants.
Since they have (very) brief pauses between them, they give a structure to words.
French syllables are mainly (78%) based on a consonant sound (C), followed by a vowel sound (V). For example the 'ta' in tabac /ta.ba/.
English syllables however are based on CVCs, so it can be a bit difficult to adjust to the French system.
French syllables are also generally unstressed throughout a word, and words are often joined to continue syllables. They do this with elision (l'aube), liaison (vous avez – the s is sounded to join), and enchainment (avec elle) - see below. This means that the whole speech tends to follow a regular rhythm – often referred to as the ‘musicality’ of French. Some teachers actually use a metronome to encourage this in pupils.
This rhythmic style probably drives a lot of the way French is pronounced; understanding this also helps with working out how to write French (see spelling).
The basic pattern
When possible, this is:
CV.CV etc.
Sometimes the first syllable is a single vowel sound, but the rest of the word follows the pattern:
C.CV.CV for instance, étalon /e.ta.lɔ̃/
sometimes however, you will have to include a final consonant sound in a syllable (this is often avoided at the end of the word by making it silent).
faction /fak.sjɔ̃
When you get two or more consonants together like this, you need to know if you need to make a break, and (if so) where it is.
Two consonants
In general,
The basic idea is to keep any two letters or consonant sounds which ‘go together'.
This involves:
Consonant digraphs
- two letters which make a single sound i.e. GN, CH, PH, RH, or TH
tricheur /tɹi.ʃœʁ/
OR
A hard consonant followed by a liquid
- when the first consonant is not L or R, or the two nasals M and N,
and the second consonant is L or R.
patron /pa.tʁɔ̃/
The break
When you have to split the consonants, then with two, you just go between them; with three consonants, break to leave the two with the best fit together.
exactement /ɛɡ.zak.tə.mɑ̃/
anesthésie /a.nɛs.te.zi/
Syllables are often linked across words, to maintain the rhythm of speech.
Liaison
A normally silent ending consonant sound is sounded out and transferred to the start of the next word, when this starts with a vowel sound.
Vous avez ⇨ Vou sa vez
Elision
A contraction when two words are combined. Typically when the first word ends in a vowel (sometimes silent), and the second word start with a vowel sound. The first word loses its vowel and the final consonant sound joins in with the start of the second word. The missing letter is shown with an ’
La aube ⇨ l'aube
Enchaînement
When a word ending in a consonant which is sounded, is linked together with a second word starting with a vowel sound.
Avec elle ⇨ a ve celle