Last updated: August 23, 2026
Two people can both say they made pickles and mean completely different projects. One boiled a vinegar brine, poured it over cucumbers and had jars on the shelf by dinner. The other put cucumbers, salt and water in a crock and waited three weeks while it bubbled. Both are pickles. Only one of them is fermented.
The confusion is baked into the language, because pickling once meant fermenting and now mostly means vinegar. It matters practically, because the two routes need different gear, different timelines and different safety rules. Here is the distinction, and the answer to the question that brings most people to this page.
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Quick Answer
What is the difference between pickling and fermenting?
- Pickling means preserving in acid. Fermenting means letting bacteria create the acid themselves.
- All fermented vegetables are pickled in the broad sense. Most modern pickles are not fermented.
- Vinegar pickles are ready in a day and taste sharp. Ferments take weeks and taste sour and complex.
- NCHFP separates fermented, or brined, pickles from quick process fresh pack pickles, with different recipes for each.
Bottom line: if you added vinegar, you pickled. If you added only salt and waited, you fermented.
Where the Acid Comes From
That is the entire distinction. Pickling puts acid into the food, normally as vinegar. Fermenting lets lactic acid bacteria already on the vegetable produce acid from the sugars in it. The end result in both cases is an acidic environment that spoilage organisms do not tolerate, arrived at from two different directions.
Everything else follows from that. Vinegar pickling is fast, repeatable and needs no living culture, so it behaves like cooking. Fermentation is slower, temperature sensitive and alive, so it behaves like bread dough. Neither is more authentic than the other, they are just different tools.
Why the Words Blurred
Before cheap commercial vinegar, pickling in a barrel of salt brine and fermenting were the same activity. The vinegar version scaled better for industry, took over the shelves, and kept the older word. That is why a jar labeled pickles at the supermarket almost never contains a ferment.
Are Pickles Fermented?
Usually not. The shelf stable jars in the middle aisle are vinegar pickles, packed in an acidified brine and heat processed, with no fermentation involved at any point. If a supermarket pickle were fermented, it would say so, and it would almost certainly be sold refrigerated rather than off a warm shelf.
The exceptions are real and easy to spot. A few brands sell genuinely fermented pickles from the cold case and state it on the label, using words such as naturally fermented and listing no vinegar in the ingredients. Deli style barrel pickles are the traditional version of the same thing.
How to Tell From the Jar
Read the ingredient list and note where the jar was sitting. Vinegar in the ingredients means acidified, not fermented. No vinegar plus a refrigerated shelf plus a cloudy brine means fermented. Cloudy brine on a warm shelf usually just means spices, so use the ingredient list as the deciding evidence.
The Vinegar Route in Practice
You make a brine, heat it, pour it over prepared vegetables in jars and either refrigerate them or process them in a boiling water bath. It takes an afternoon, the flavor is set by your spices rather than by microbes, and the results are consistent from batch to batch.
The rule that matters is the acidity of the vinegar. NCHFP guidance is to use vinegar of five percent acidity for pickling and not to dilute it beyond what a tested recipe specifies, because the acid is doing the preservation. Changing the vinegar to water ratio in a canning recipe is not a seasoning decision.
Gear for the vinegar route
Jars, a water bath canner and the usual canning tools. Nothing exotic, and the canner is the one real purchase. Our water bath canner guide covers sizing, and pickling jars covers the jar shapes that suit spears and whole cucumbers.
The Fermenting Route in Practice
You pack vegetables in a salt brine, keep everything submerged, and wait while the bacteria work. There is no heat step during fermentation and no vinegar. Finished ferments go in the refrigerator, or get canned using the times in a tested recipe if you want them shelf stable.
Take the salt amount and the curing time from a tested source rather than from memory. NCHFP guidance is explicit that the salt concentration in fermented pickle recipes should not be reduced, because it is the salt that keeps the fermentation on the safe side rather than seasoning it.
Gear for the ferment route
A wide mouth jar, a weight and an airlock lid. That is genuinely the whole list for a first batch, and the weight is the piece people skip and regret. Our lacto fermented pickle walkthrough is the step by step version.
Scaling up means a crock
Once you are fermenting a garden row rather than a jar, stoneware takes over. A water seal crock keeps the smell in the vessel instead of the kitchen, which is the complaint that usually triggers the upgrade. See our crock guide.
Side by Side
The two routes differ in almost everything except the shape of the finished jar. Sorted by the things that actually decide which one you do this weekend.
| Aspect | Vinegar pickling | Lacto fermenting | Why it matters |
|---|---|---|---|
| Source of acid | Added vinegar | Bacteria produce lactic acid | Decides the recipe rules you follow |
| Time to finish | Same day, plus curing for flavor | Weeks, depending on temperature | Fits a harvest day or does not |
| Flavor | Sharp, spice led, consistent | Sour, complex, varies by batch | Personal preference, not quality |
| Storage | Shelf stable when canned to a tested recipe | Refrigerator, unless canned to a tested recipe | Decides how much shelf you need |
Recipe categories and the distinction between brined and fresh pack pickles follow the National Center for Home Food Preservation, which publishes separate tested recipes for each.
The Safety Line Between Them
Both methods work because the finished food is acidic, and the safety rules exist to make sure it actually is. NCHFP classifies acid foods as those with a pH of 4.6 or lower, which is the boundary that decides whether a water bath process is appropriate at all. Tested pickle recipes are built to land safely on the acid side of that line.
Which is why the recipe is not a suggestion in either method. Cutting vinegar in a fresh pack recipe, reducing salt in a fermented one, or inventing a processing time all move you off a tested process. Our canning safety page covers why low acid food is a different problem entirely.
Frequently Asked Questions
Is pickling a type of fermentation? No, it is the other way around. Pickling is the broad category of preserving in acid, and fermenting is one way to produce that acid. Modern vinegar pickling involves no fermentation at all, which is why the two words are not interchangeable.
What are fermented pickles called? Brined pickles, sour pickles, half sours, or in NCHFP publications simply fermented pickles. Deli sours and barrel pickles are the traditional American version. Full sour means a longer ferment than half sour, not a different method.
Are supermarket dill pickles fermented? The shelf stable ones almost never are. They are cucumbers in an acidified brine, heat processed for shelf life. Refrigerated brands that state naturally fermented on the label and list no vinegar are the genuine article, and they cost more for exactly that reason.
Does fermenting make food more nutritious? Fermented vegetables contain live lactic acid bacteria before they are heated, and that is why people seek them out. We are a gear site rather than a nutrition authority, so we leave the health questions to dietitians and stick to what the equipment does.
Can I ferment first and then can the result? Yes, using a tested recipe that covers exactly that. NCHFP fermented pickle recipes include the boiling water bath option with its own processing times, and canning kills the live cultures. Do not transfer a processing time from a different recipe.
Which should a beginner do first? Vinegar pickling, if you want a result today and a shelf of jars. Fermenting, if you want the deli flavor and are happy to wait. Fermenting also needs less equipment, so it is the cheaper experiment. Our vegetable fermenting guide is the starting point for that route.
The Bottom Line
Pickling is preserving in acid and fermenting is one way of getting that acid, so the two overlap without being the same thing. Vinegar pickling suits a harvest day, a full pantry shelf and a predictable result. Fermenting suits patience, a cool corner and the sour flavor that no vinegar recipe reproduces. Choose by the timeline you have, follow the tested recipe for whichever route you pick, and remember that most jars sold as pickles never fermented at all. Next: how to make lacto fermented pickles, or the water bath method for the vinegar route.