Low-moisture mozzarella is mozzarella cheese with a moisture content between 45% and 52% by weight. That’s significantly drier than fresh mozzarella, which can contain 60% water or more. This lower water content gives the cheese a firmer texture, a longer shelf life, and the ability to melt into the stretchy, golden-brown layer you see on most pizza in the United States.
If you’ve ever bought a block or bag of shredded mozzarella at a grocery store, you’ve almost certainly bought low-moisture mozzarella. Fresh mozzarella, the soft white balls packed in liquid, is a different product entirely.
How It Differs From Fresh Mozzarella
The core difference is water. Fresh (or “high-moisture”) mozzarella can be 60% water or higher, especially from shops that still hand-stretch the cheese. Low-moisture mozzarella, by FDA definition, must fall between 45% and 52%. That gap of roughly 10 to 15 percentage points changes almost everything about how the cheese behaves.
Fresh mozzarella is soft, milky, and perishable. It’s best eaten within days and releases a lot of water when heated, which can turn a pizza soggy. Low-moisture mozzarella is denser and semi-firm. You can slice it, shred it, or grate it. When it melts, it browns and bubbles without flooding the surface with liquid. It also has a more concentrated, slightly salty flavor compared to the mild, creamy taste of fresh mozzarella.
Whole Milk vs. Part-Skim
Walk down the cheese aisle and you’ll notice two common labels: low-moisture mozzarella and low-moisture part-skim mozzarella. The difference is fat content. Standard low-moisture mozzarella must contain at least 45% milkfat (measured as a percentage of the solids), while the part-skim version is made with reduced-fat milk and contains less fat overall.
Part-skim is by far the more common variety in American grocery stores and is what most pizza shops use. It melts well, browns nicely, and has slightly fewer calories per serving. Whole-milk low-moisture mozzarella is richer and creamier when melted, with a more buttery flavor. For pizza, part-skim tends to produce better browning and stretch, while whole-milk gives a softer, more indulgent melt.
Why It Melts So Well on Pizza
Low-moisture mozzarella became the default pizza cheese in the U.S. for practical reasons. Its reduced water content means it doesn’t release puddles of liquid onto the crust during baking. Instead, the surface dehydrates enough to brown and blister while the interior stays stretchy. The result is that characteristic layer of melted cheese with golden spots that pulls apart in long strings.
Fresh mozzarella can work on pizza too, but it needs a different approach. You typically slice it thin and either pat it dry or add it late in the bake to prevent excess moisture from pooling. Low-moisture mozzarella is more forgiving. You can pile it on cold, bake it at high heat, and it performs consistently every time.
How It’s Made
Both fresh and low-moisture mozzarella start the same way. Milk is acidified and treated with enzymes to form curds, which are then heated and stretched in hot water, a process called pasta filata. This stretching step is what gives all mozzarella its signature stringy, elastic texture.
The difference comes after stretching. Fresh mozzarella is shaped, cooled in brine, and packaged quickly. Low-moisture mozzarella goes through additional steps to remove water. It’s typically pressed, salted, and aged briefly, sometimes for just a few weeks. This extra processing firms the texture, concentrates the flavor, and dramatically extends how long the cheese lasts.
Shelf Life and Storage
One of the biggest practical advantages of low-moisture mozzarella is durability. USDA specifications require block or loaf mozzarella to have a shelf life of at least 120 days when stored between 32°F and 42°F. Shredded mozzarella must last at least 90 days, and string cheese (which is also low-moisture mozzarella) at least 150 days. Compare that to fresh mozzarella, which is best consumed within a week of purchase and often within a day or two of opening.
Once you open a package, wrap the remaining cheese tightly in plastic wrap or seal it in an airtight container. Exposed surfaces dry out and harden quickly. Shredded mozzarella in a resealable bag will stay good for several weeks after opening if kept cold and sealed between uses. You can also freeze low-moisture mozzarella for longer storage. The texture may become slightly crumblier after thawing, but it still melts fine for cooked dishes.
Common Uses Beyond Pizza
Pizza gets the spotlight, but low-moisture mozzarella shows up in a wide range of cooking. It’s the standard cheese in baked ziti, lasagna, chicken parmesan, and most Italian-American casseroles. Shredded versions go into quesadillas, stuffed peppers, and garlic bread. String cheese is just low-moisture mozzarella pulled into ropes, making it one of the most popular snack cheeses in the country.
For dishes where you want a clean melt without excess grease or water, low-moisture part-skim mozzarella is hard to beat. For richer applications like a French bread pizza or a cheese-stuffed burger, whole-milk low-moisture mozzarella adds more flavor and a creamier texture. Both versions are mild enough to pair with bold sauces and seasonings without competing for attention.