What Makes a Mezuzah Kosher? A Sofer's Complete Guide (2026)
When people search for a kosher mezuzah, most are surprised to learn that the beautiful case on the doorpost is not the mezuzah at all. The mezuzah is the small hand-written parchment scroll inside — and whether it is truly kosher depends on details that only a trained Sofer STaM can verify. Here is exactly what makes a mezuzah kosher, and what to look for before you buy.
1. It must be hand-written by a Certified Sofer STaM
Every letter of the two Torah passages inside a mezuzah (Shema and V'haya im shamoa) must be written by hand with a quill and special black ink, by a sofer who has been trained and certified in the halachot of Safrut.
Printed mezuzot, photocopied scrolls, or computer-printed parchments are not kosher — not under any halachic opinion. If you bought a mezuzah on Amazon or eBay for under $20, it is almost certainly not kosher, even if the listing says 'kosher.' A real kosher mezuzah scroll cannot be produced at that price.
2. It must be written on genuine klaf (parchment)
The scroll must be written on klaf — parchment made from the skin of a kosher animal, processed specifically for Safrut use. Paper, synthetic parchment, or animal hide that wasn't prepared with the proper intent is invalid.
Real klaf has a distinctive feel and slight curl. A sofer purchases it from licensed parchment makers in Israel; it is not something a hobbyist can produce.
3. Every letter must be correctly shaped and intact
Each of the 713 letters in a mezuzah scroll has a specific halachic shape. A cracked letter, a letter touching its neighbor, a missing crown (tag) on a sha'atnez-getz letter, or ink that has faded mid-letter can make the entire mezuzah invalid.
This is why mezuzot must be inspected under magnification. To the naked eye a scroll may look fine, but a sofer's loupe reveals cracks, fades, and letter defects that a homeowner would never notice. See how to know if your mezuzah is still kosher for the most common defects.
4. It must be written in order, with proper intent (kavanah)
The sofer must write the letters in order, from the first letter of Shema to the last letter of V'haya im shamoa. Skipping a letter and filling it in later invalidates the scroll. Before writing the Names of Hashem, the sofer says aloud that he is writing them with the intent of sanctity (l'shem kedushas Hashem).
This is part of why a Certified Sofer STaM is required — not just any Jewish scribe. STaM stands for Sifrei Torah, Tefillin, and Mezuzot, and certification confirms training in these halachic requirements.
5. The case is decorative — but the scroll must face the right way
The case (often beautiful glass, metal, or wood) has no halachic status. It only protects the scroll. When you roll the parchment and place it in the case, the writing should face inward (toward the room being entered), with the top of the scroll at the top of the case.
On the outside of the scroll, the word שדי (Shaddai) is written. Many cases have a window showing the letter ש through it — that is how you orient it.
How to be sure your mezuzah is kosher
There is no shortcut. The only way to know is to have a Certified Sofer STaM open the case, examine the scroll under magnification, and tell you. Most homeowners in Miami have mezuzot they assumed were kosher for years — and a checking session often reveals at least one that needs repair or replacement.
Want to know what is actually inside? Read what goes inside a mezuzah scroll for the full text and meaning.
Buy a verified kosher mezuzah in Miami
Rabbi Levi Backman, Certified Sofer STaM, sells hand-written kosher mezuzah scrolls personally inspected before delivery — starting at $70. He also installs them at the correct height and angle, with the bracha, across Miami, Aventura, Miami Beach, Bal Harbour, Surfside, Sunny Isles, and Hallandale.
See available scrolls on the mezuzah scrolls page, or learn more about mezuzah inspection in Miami. WhatsApp 845-729-1459 to order or schedule.
Talk to Rabbi Levi
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