Yes, you can use kosher salt instead of canning salt in some recipes, but only when grain size and additives will not change the tested canning formula.
Home canning recipes often call for canning or pickling salt, then you look in the pantry and see only a box of kosher salt. The question Can I use kosher salt instead of canning salt? comes up all the time, and the answer depends on what you are canning and which type of kosher salt you own.
This guide walks through when a kosher salt swap is safe, when it only affects quality, and when it can quietly throw off a tested recipe. You will see how grain size, additives, and the type of food (pickles, vegetables, meats) change the rules.
Salt Types For Canning At A Glance
Before getting into detailed rules, it helps to see how common salts differ. The chart below compares the salts you are most likely to reach for when canning.
| Salt Type | Additives | Best Use In Home Canning |
|---|---|---|
| Canning / Pickling Salt | None; pure sodium chloride | All canning recipes, especially pickles and ferments where salt level matters |
| Kosher Salt, Flake (Diamond-style) | Usually none, low density | Possible swap for canning salt by weight only; avoid in brine recipes that give salt by volume |
| Kosher Salt, Compact (Morton-style) | May contain anti-caking agents | Can season canned foods; use with care in brines and only if free of iodine and flavoring |
| Table Salt, Iodized | Iodine and anti-caking agents | Not advised for pickles; may darken or cloud liquid, fine for plain vegetables where salt is optional |
| Table Salt, Non-Iodized | Anti-caking agents | Safe but may cloud brine; can work when clarity does not matter |
| Sea Salt | Trace minerals, sometimes additives | Safe to eat; may change color or flavor, not ideal for tested canning recipes |
| Salt Substitutes (Potassium-based) | Potassium chloride, flavorings | Never swap directly in canning recipes unless a tested recipe calls for them |
Can I Use Kosher Salt Instead Of Canning Salt? Home Canning Basics
To answer Can I use kosher salt instead of canning salt? you need to know what salt does in your recipe. In some canned foods, salt is only there for flavor. In others, salt affects texture, fermentation, or how the finished jar looks.
The National Center for Home Food Preservation notes that canning or pickling salt is recommended because it is pure and fine-grained, so it dissolves well and keeps brines clear. Flake salts, such as many kosher salts, vary a lot in density, which makes volume measurements unreliable for some recipes.
On the other hand, for many pressure-canned vegetables, meats, poultry, and seafood, the USDA explains that salt can be left out entirely for a lower sodium product, since it seasons the food but does not control safety in those recipes. In those cases, the type of salt affects flavor more than safety, so kosher salt becomes much easier to use as a substitute.
How Kosher Salt Differs From Canning Salt
Kosher salt and canning salt are both mostly sodium chloride, yet they behave differently in recipes. Three things matter most: grain size, density, and additives.
Grain Size And Density
Canning salt is very fine, so it packs tightly into a spoon and dissolves fast in liquid. Kosher salt crystals are larger and more open. A tablespoon of canning salt weighs far more than a tablespoon of light flake kosher salt.
Testing published by university extension programs shows giant swings in density between brands. One study from a Master Food Preserver program found that a tablespoon of canning salt weighed around 18.9 grams, while a tablespoon of a light flake kosher salt weighed only about 8.2 grams. That means you would need more than twice the volume of that kosher salt to match the weight of canning salt.
This matters because tested canning recipes are built on specific salt concentrations by weight. When the recipe gives salt in spoons instead of grams, the testing assumed a fine, dense salt like standard canning salt. Swapping in a fluffy kosher salt by volume cuts the true salt content in half or more.
Additives And Clarity
Canning salt is additive-free. Some kosher salts share that quality, but others contain anti-caking agents. Those additives do not harm safety, yet they can cloud brine and leave sediment at the bottom of jars.
Several extension services, including guidance on salt in canning from the University of Nebraska–Lincoln, explain that flake kosher salt can stand in for canning salt in some canning recipes, but it is not advised for fermented pickles where salt concentration controls microbial growth.
When A Kosher Salt Swap Is Safe
There are many cases where using kosher salt instead of canning salt works well and does not disturb safety. The main conditions are:
- You are canning foods where salt is optional for safety.
- You match the weight of salt, not the spoon measurement.
- You use a pure kosher salt without added flavorings.
Pressure-Canned Vegetables, Meats, And Seafood
For pressure-canned vegetables, meats, poultry, and seafood, salt is there for taste, not preservation. The National Center for Home Food Preservation states that you can omit salt in these products; the tested process time and pressure keep the food safe on their own.
In practice, that means you can season jars with kosher salt instead of canning salt, or skip salt entirely and season the food when you open the jar. If you season with kosher salt, any small difference in salt weight per teaspoon only affects how salty the food tastes, not the safety of the recipe.
Tomato Products Where Salt Is Optional
Many modern tomato canning recipes give salt as “optional.” When you see that language in a tested recipe, you can use kosher salt instead of canning salt, or leave it out. Again, the salt is there for flavor, not for safety or texture in those jars.
Brines Measured By Weight
Some pickling and brining recipes now list salt in grams instead of spoons. When the recipe gives a weight, you can safely use kosher salt as long as it is plain and additive-free. A kitchen scale makes this easy: weigh out the needed grams of kosher salt and ignore the volume.
Matching the weight gives you the same brine strength the testers used, so your ferment or pickle will behave the same even though the crystals look different.
When Kosher Salt Can Cause Problems
There are also cases where swapping kosher salt for canning salt can quietly throw a recipe off balance. The risks range from soft, poor-tasting pickles to a ferment that never reaches the right acid level.
Fermented Pickles And Sauerkraut
Fermented pickles and sauerkraut depend on a narrow salt range. Too little salt allows the wrong microbes to grow and can lead to soft, poor-flavored jars. Too much salt slows the ferment or makes the food unpleasantly salty.
Extension publications describe how flake salts vary so much in density that a spoonful can hold half the salt of the same spoon of canning salt. That kind of error matters in a ferment. For this reason, standard advice is to stick with canning salt for fermented pickles, or to only use kosher salt when the recipe itself gives clear weight-based directions.
Quick Pickles Using Traditional Recipes
Quick pickles (fresh pack pickles processed in a boiling-water bath) often rely on a mix of vinegar, water, and a specific amount of salt. While acid from vinegar is the main safety factor, salt still affects texture and flavor. Many classic recipes were tested with canning salt.
Guides from land-grant universities often warn that flake kosher salt is not recommended for pickled and fermented foods because the varied density makes volume measures unreliable. If your recipe calls for canning or pickling salt by the tablespoon and does not mention kosher salt, the most reliable choice is to follow that direction.
Very Clear Brines For Display Pickles
If you love crystal-clear pickle jars where every cucumber slice shows, canning salt does that job far better. Anti-caking agents in some kosher and table salts can leave a cloudy brine or a fine layer of sediment in the bottom of the jar. That does not harm safety, yet it can spoil the look of gift jars or fair entries.
Using Kosher Salt In Place Of Canning Salt Safely
When you decide to use kosher salt instead of canning salt, a few simple checks keep your jars closer to the tested recipe. These steps help you reduce risk while still working with the salt you have on hand.
Step 1: Check The Label For Additives
Pick up the box and read the ingredient list. You want a kosher salt that lists only “salt” or “sodium chloride.” If you see iodine, flavorings, or long anti-caking agent names, that brand is better left for everyday cooking and not for pickles or ferments.
Step 2: Find Out If The Recipe Needs Precise Salt Levels
Look at the type of food. If you are pressure-canning green beans, carrots, meat, or broth, salt is a seasoning choice. If you are making fermented pickles or sauerkraut, salt is part of the preservation method. Quick pickles fall in the middle, since safety depends more on vinegar but texture and flavor still respond to salt strength.
When in doubt, look for a tested recipe from an extension service that names the salt type you want to use. The University of Maine, North Carolina State, and many other programs publish tested recipes that clearly list “canning and pickling salt” where needed.
Step 3: Convert By Weight When Possible
If the recipe gives salt by weight, or you can find a conversion from spoons to grams in a trusted source, always use weight. A small digital scale costs little and pays off quickly for canning.
Here is a rough guide, based on extension testing of salt densities, to show how different the volumes can be. Do not use this chart to override a recipe that calls for canning salt; instead, use it to understand how far off a straight volume swap can drift.
| Target Salt Weight | Approx. Canning Salt Volume | Approx. Flake Kosher Salt Volume |
|---|---|---|
| 19 grams | 1 Tbsp canning salt | About 2 Tbsp flake kosher salt |
| 38 grams | 2 Tbsp canning salt | About 4 Tbsp flake kosher salt |
| 57 grams | 3 Tbsp canning salt | About 6 Tbsp flake kosher salt |
| 95 grams | 5 Tbsp canning salt | About 10 Tbsp flake kosher salt |
| 114 grams | 6 Tbsp canning salt | About 12 Tbsp flake kosher salt |
The numbers highlight the core problem: a spoon of flake kosher salt can weigh half as much as a spoon of canning salt. When a recipe only gives spoons and expects canning salt, you either need a tested conversion for your brand or you stick with canning salt.
Step 4: Watch For Quality Changes
Even when safety is not at stake, changing the salt can affect crunch, color, and flavor. You might find that kosher salt in a quick pickle leaves the cucumbers a little softer, or that a particular brand adds a faint mineral taste from trace elements.
Start with a small batch when trying a new salt swap. Label the jars with the salt used, then compare them to a batch made with canning salt. That way you are not stuck with a whole shelf of pickles that you do not enjoy.
So, Can I Use Kosher Salt Instead Of Canning Salt?
Here is the practical answer: you can use kosher salt instead of canning salt for many pressure-canned foods where salt is optional, and for brines measured by weight. In those cases, the choice is mostly about flavor, texture, and the look of the brine.
For fermented pickles, sauerkraut, and older quick pickle recipes that call for canning or pickling salt by the spoon, the safest route is to follow the recipe and buy a box of canning salt. It is inexpensive, easy to find, and removes guesswork about density and additives.
The more you work with both salts, the easier it becomes to see where a swap makes sense and where it starts to bend a tested recipe too far. With a good scale, a little label reading, and trusted sources such as the National Center for Home Food Preservation, you can keep your jars safe and tasty whether you reach for canning salt or a pure kosher salt.
