What are the four forms of Arabic letters?
Why do Arabic letters change shape?
Arabic is always joined-up writing. Letters inside a word connect to each other along a baseline, the way cursive handwriting does in English. To make those joins, a letter takes a slightly different shape depending on whether something comes before it, after it, or both.
The letter itself does not change — its sound and its name stay the same. Only its outline adapts so it can link to its neighbours.
The four positions, with examples
The small line (ـ) shows the side where the letter joins its neighbour. In the initial form the join is on the left, because the next letter is written to the left; in the final form the join is on the right.
| Letter | Isolated | Initial | Medial | Final |
|---|---|---|---|---|
| ب Ba | ب | بـ | ـبـ | ـب |
| ع Ayn | ع | عـ | ـعـ | ـع |
| ه Haa | ه | هـ | ـهـ | ـه |
| م Mim | م | مـ | ـمـ | ـم |
The six letters that never join forward
Alif (ا), dal (د), dhal (ذ), ra (ر), zay (ز) and waw (و) connect only to the letter before them. Teachers often call them the “orphan” or “non-connecting” letters. After one of them, the next letter starts fresh in its initial or isolated form — which is why some Arabic words look as if they have small gaps.
Example: in وَرْد (ward, rose) every letter is a non-connector, so all three letters stand apart even though they form one word.
Reading the forms inside a word
Take كِتَاب (kitaab, book):
- ك kaf is at the start, so it takes its initial form.
- ت ta sits between two letters, so it is medial.
- ا alif ends its group: it joins the ta before it but not the ba after it — final form.
- ب ba has nothing joined before it (alif does not join forward), so it is written in its isolated form.
Two letters that only appear at the end
Ta marbuta (ة) and alif maqsura (ى) only ever appear at the end of a word, so you will only meet their isolated and final shapes.
Frequently asked questions
Do all Arabic letters have four forms?
No. 22 of the 28 letters have four forms. The six non-connecting letters (ا د ذ ر ز و) have only two, because they never join the letter after them.
Which form does a letter take at the start of a word?
The initial form — unless the letter is one of the six non-connectors, which simply use their isolated shape.
Does the letter's sound change with its form?
No. The shape changes so the letter can join its neighbours; the sound and name stay the same.
How can I see the form of every letter in a word?
Type the word into Letterstroke: under the animation each letter is shown in the exact form it takes in that word, with its name and position.