When you first start making jam, sugar seems like the simple part.

Fruit goes in the pan.
Sugar goes in the pan.
Everything bubbles away.
Eventually, with a bit of luck, it turns into jam.

Then you start looking at different recipes and suddenly there are several types of sugar being mentioned: granulated sugar, jam sugar, preserving sugar, and sometimes even special low-sugar pectin products.

So which one should you actually use?

The simple answer is this:

Granulated sugar is enough for many traditional jams, especially when using high-pectin fruits or mixed fruit preserves. Jam sugar can be useful when making jam with low-pectin fruits, or when you want a more reliable set.

At The Handmade Way, I usually prefer simple ingredients and traditional methods. That means I often use ordinary granulated sugar and rely on the fruit, lemon juice, cooking time, and natural pectin to do the work.

But jam sugar does have its place.

This guide explains the difference between jam sugar, granulated sugar and preserving sugar, when to use each one, and how to decide what is right for your homemade jam.

Sugar is not just there to make jam sweet. It also helps with:

• Texture
• Set
• Colour
• Flavour
• Preservation
• Shelf life

When fruit, sugar, acid and pectin are heated together, they create the gel structure that gives jam its set. This is why reducing sugar in a traditional jam recipe can change more than just the sweetness. It can also affect whether the jam sets properly, how long it keeps, and how it behaves once opened.

That does not mean you can never reduce sugar. But it does mean you should understand what sugar is doing before you start changing a recipe. I’ve written separately about reducing sugar in jam, because sugar does far more than simply sweeten the fruit. Reducing Sugar in Jam: What You Need to Know.

What Is Granulated Sugar?

Granulated sugar is ordinary white sugar. It is probably the sugar most of us already have in the cupboard, and it is used in many traditional jam recipes.

Granulated sugar does not contain added pectin. That means it relies on the natural pectin in the fruit, along with acid and boiling time, to help the jam set.

For many jams, this is absolutely fine. Granulated sugar works well when you are using fruits that are naturally high in pectin, or when you are combining low-pectin fruit with high-pectin fruit.

Good examples include:

• Apple and blackberry jam
• Blackcurrant jam
• Gooseberry jam
• Redcurrant jelly
• Crab apple jelly
• Quince jelly
• Some plum jams
• Rhubarb and apple jam

This is usually my preferred starting point. At The Handmade Way, I would rather understand the fruit and build the recipe around it than automatically add pectin or specialist sugar every time.

What Is Jam Sugar?

Jam sugar is sugar with added pectin. Pectin is the natural substance found in fruit that helps jam set. Some fruits are naturally high in pectin, while others are naturally low in pectin.

Jam sugar is designed to help those lower-pectin fruits set more reliably.

It can be especially useful for fruits such as:

• Strawberries
• Raspberries
• Peaches
• Apricots
• Pears
• Sweet cherries
• Blueberries
• Rhubarb

These fruits can all make lovely jam, but they often need a little help to set. That help can come from:

• Lemon juice
• Added pectin
• Jam sugar
• A high-pectin fruit such as apple, redcurrant or gooseberry

Jam sugar is basically the convenient option because the pectin is already mixed into the sugar.

What Is Preserving Sugar?

This is where things can get a little confusing.

Preserving sugar is not the same as jam sugar.

Preserving sugar usually has larger crystals than ordinary granulated sugar. It dissolves more slowly and can help produce a clearer preserve with less scum, especially in jellies and marmalades.

But preserving sugar does not usually contain added pectin.

So the simple breakdown is:

Granulated sugar: ordinary white sugar, no added pectin.
Jam sugar: sugar with added pectin.
Preserving sugar: larger sugar crystals, usually no added pectin.

For most beginner jam makers, the most important distinction is between granulated sugar and jam sugar.

So Which Sugar Should You Use?

The best sugar depends on the fruit, the recipe, and the result you want.

Use Granulated Sugar When…

Granulated sugar is a good choice when the fruit already contains enough natural pectin, or when you are making a mixed fruit preserve that includes high-pectin fruit.

Use granulated sugar for:

• Apple and blackberry jam
• Gooseberry jam
• Blackcurrant jam
• Redcurrant jelly
• Crab apple jelly
• Quince jelly
• Many plum jams
• Marmalade
• Mixed fruit jams that include apple, currants or citrus

This is also the sugar I would normally choose when I want a more traditional preserve. The flavour can be deeper, richer and more rounded because the fruit has had time to cook down properly.

Use Jam Sugar When…

Jam sugar is useful when the fruit is naturally low in pectin, or when you want a firmer and more reliable set.

Use jam sugar for:

• Strawberry jam
• Peach jam
• Apricot jam
• Cherry jam
• Blueberry jam
• Pear jam
• Rhubarb jam
• Very ripe fruit
• Beginner-friendly jam recipes where reliability matters

This does not mean jam sugar is better. It just means it solves a particular problem. If the fruit naturally brings enough pectin, ordinary sugar is usually fine.
If it does not, jam sugar may help.

The Handmade Way Approach

My usual approach is not to reach for jam sugar automatically. That does not mean jam sugar is bad. It is useful, especially for certain fruits. But I prefer to start with the fruit itself.

For example, instead of making a low-pectin fruit jam and immediately adding jam sugar, I often prefer to combine fruits. Apple and blackberry is a good example.

Blackberries bring flavour, colour and that proper hedgerow feel. Apples bring body, natural sweetness and pectin. The result is a preserve that sets more naturally and has a more interesting flavour than either fruit on its own.

This is the approach I like for The Handmade Way:

Start with the fruit.
Understand what it naturally gives you.
Use high-pectin fruit where it helps.
Add lemon juice when needed.
Use granulated sugar where possible.
Use jam sugar when it genuinely improves the recipe.

It is not about being purist. It is about learning the skill.

High-Pectin and Low-Pectin Fruits

Understanding fruit is one of the easiest ways to decide which sugar to use.

High-Pectin Fruits

These fruits often work well with ordinary granulated sugar:

• Apples
• Crab apples
• Gooseberries
• Blackcurrants
• Redcurrants
• Cranberries
• Quince
• Citrus peel
• Some plums
• Slightly underripe fruit

These are useful fruits for traditional jam making because they help the preserve set naturally.

Low-Pectin Fruits

These fruits may benefit from jam sugar, added pectin, lemon juice, or being combined with high-pectin fruit:

• Strawberries
• Raspberries
• Blueberries
• Sweet cherries
• Peaches
• Apricots
• Pears
• Rhubarb
• Pineapple

Low-pectin fruits are not bad jam fruits. They just behave differently.

A strawberry jam can be wonderful, but it often needs a little more support than something like blackcurrant or gooseberry jam. If you want a deeper explanation of how pectin works, I’ve written a full beginner’s guide to pectin in jam making What Is Pectin and Do You Really Need It for Jam?

Jam Sugar vs Granulated Sugar: Taste and Texture

The sugar you choose can affect the finished jam.

Granulated Sugar Texture

Jam made with granulated sugar can have a softer, more traditional set.

Because it relies on natural pectin and boiling time, it may not always set exactly the same way every time. That is part of homemade preserving. It can be glossy, soft, spoonable and full of cooked fruit flavour.

For many of my recipes, that is exactly what I want.

Jam Sugar Texture

Jam sugar usually gives a more reliable set.

Depending on the fruit and recipe, it can produce a firmer jam. That can be helpful, but it can also be too firm if you use jam sugar with fruit that already contains plenty of pectin. This is why I would not automatically use jam sugar for something like:

• Blackcurrant jam
• Gooseberry jam
• Crab apple jelly
• Quince jelly
• Marmalade

Those fruits already bring plenty of natural setting power. Using jam sugar on top can push the texture too far.

Flavour Difference

Jam sugar itself is not really about flavour. It is about set.

However, because jam sugar can reduce the time needed to reach a set, the finished jam may taste slightly brighter and fresher.

Granulated sugar jams often need a longer boil, which can create a deeper, more traditional preserve flavour.

Neither is better. They are just different.

Can You Use Granulated Sugar Instead of Jam Sugar?

Often, yes. But it depends on the recipe.

If a recipe specifically asks for jam sugar, it may be relying on the added pectin to set properly. If you swap it for granulated sugar, the jam may turn out softer or may not set as expected.

You may need to adjust by:

• Adding lemon juice
• Adding a high-pectin fruit
• Cooking slightly longer
• Testing carefully for setting point
• Accepting a softer set

For example, if you make strawberry jam with granulated sugar instead of jam sugar, it can still work. But you need to be more aware of pectin, lemon juice and setting point.

The important point is that you cannot always swap sugars without changing the result.

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Can You Use Jam Sugar Instead of Granulated Sugar?

Yes, but again, be careful. If a recipe asks for granulated sugar and you use jam sugar instead, you are adding extra pectin to the recipe.

That may be fine for low-pectin fruit.

But if the fruit is already high in pectin, the jam may become too firm, rubbery, or over-set.

I would be cautious using jam sugar with:

• Blackcurrants
• Redcurrants
• Gooseberries
• Crab apples
• Quince
• Marmalade
• High-pectin mixed fruit jams

Jam sugar is helpful when it solves a problem. It is not automatically better.

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What About Reducing Sugar?

This is where things get important. Do not assume that using jam sugar means you can freely reduce the sugar in a traditional recipe.

Jam sugar contains pectin, but sugar still has a role in set, texture and preservation.

If you want to make low-sugar jam, use a recipe designed specifically for low-sugar jam and consider using pectin made for low-sugar preserves.

The safest rule is:

Traditional jam recipe = follow the sugar level.
Low-sugar jam = use a proper low-sugar recipe.

If your main question is whether you can reduce the sugar, I’d recommend reading this guide before changing a recipe: Reducing Sugar in Jam: What You Need to Know

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Does Jam Sugar Make Jam Safer?

Not by itself.

Jam sugar helps with set because it contains added pectin. It does not magically make any preserve safe.

Food safety still depends on:

• Using a reliable recipe
• Correct sugar and acid balance
• Clean preparation
• Sterilised jars
• Proper sealing
• Correct storage
• Refrigerating after opening
• Discarding anything mouldy, fizzy or suspicious

Sugar contributes to preservation, but it is only one part of the whole process.

This is especially important if you are reducing sugar, changing fruit quantities, or adapting recipes.

Whichever sugar you use, clean jars, good lids and proper storage matter just as much as getting the set right:

Equipment (Affiliate Links):
A good, heavy bottomed pan
Preserving jars
Preserve set including funnel and tongs
Scales
Sterilising Pot
Jam Thermometer

Setting Point Still Matters

Whether you use granulated sugar or jam sugar, you still need to cook the jam properly.

Jam sugar does not remove the need to test the set.

A common setting point for jam is around 104–105°C, but I would still use the cold plate test alongside a thermometer if possible.

The cold plate test is simple:

1. Put a small plate in the freezer.
2. Spoon a little hot jam onto the cold plate.
3. Leave it for about 30 seconds.
4. Push it gently with your finger.
5. If it wrinkles and does not run straight back, it is likely ready.

Even with jam sugar, I would still test. It is better to take a minute to test than to end up with jars of syrup.

Common Mistakes When Choosing Sugar for Jam

Using Jam Sugar for Every Jam

Jam sugar is not automatically better.

If the fruit is already high in pectin, added pectin may make the jam too firm.

Using Granulated Sugar with Low-Pectin Fruit Without Adjusting

This can work, but you may need lemon juice, extra cooking time, or a high-pectin fruit.

Confusing Preserving Sugar with Jam Sugar

Preserving sugar does not usually contain pectin.

If your recipe relies on added pectin, preserving sugar may not behave like jam sugar.

Reducing the Sugar Without Using a Low-Sugar Recipe

This is one of the biggest causes of runny jam and shorter shelf life.

Making Too Large a Batch

Large batches can take too long to reach setting point and may not set as expected.

Not Testing the Set

Even if you use the “right” sugar, you still need to test.

My Personal Rule of Thumb

This is the simple rule I would use in my own kitchen:

If the fruit has enough pectin, use granulated sugar.
If the fruit is low in pectin, either pair it with a high-pectin fruit or consider jam sugar.

That is why apple and blackberry works so well.

Rather than adding commercial pectin or reaching for jam sugar immediately, the apple helps the blackberry set naturally. You get a better-balanced preserve, a more interesting flavour, and a method that feels closer to traditional home preserving.

But if I was making a pure strawberry jam, especially for gifts or if I wanted a reliable result, I would be much more open to using jam sugar.

It is not about one sugar being “right” and the other being “wrong”.

It is about choosing the right tool for the job.

Frequently Asked Questions

Is jam sugar the same as granulated sugar?

No. Granulated sugar is ordinary white sugar. Jam sugar contains added pectin to help jam set.

Is preserving sugar the same as jam sugar?

No. Preserving sugar usually has larger crystals and does not usually contain added pectin. Jam sugar contains added pectin.

Can I use normal sugar for jam?

Yes. Many traditional jams use normal granulated sugar, especially when made with high-pectin fruits or mixed fruit combinations.

Why use jam sugar?

Jam sugar is useful for low-pectin fruits such as strawberries, peaches, cherries, pears and rhubarb. It can help create a more reliable set.

Does jam sugar make jam thicker?

Usually, yes. Because it contains added pectin, it can help jam set more firmly.

Can jam sugar make jam too thick?

Yes. If you use jam sugar with fruit that is already high in pectin, the jam may set too firmly.

Can I reduce the sugar if I use jam sugar?

Not necessarily. If you want low-sugar jam, use a recipe designed for low-sugar jam and the correct type of pectin.

What sugar is best for beginner jam makers?

Jam sugar can be helpful for low-pectin fruits because it improves the chances of a set. But for high-pectin fruit or mixed fruit preserves, granulated sugar is often enough.

Final Thoughts

Jam sugar and granulated sugar both have a place in homemade jam making.

Granulated sugar is simple, affordable, easy to find, and perfect for many traditional jams. If you are working with high-pectin fruit, or making mixed fruit preserves like apple and blackberry, it is often all you need.

Jam sugar is useful when the fruit needs help. It contains added pectin, which can make low-pectin fruits set more reliably. That makes it especially handy for strawberry, peach, cherry, pear, rhubarb and other softer-setting jams.

My Handmade Way approach is to start with the fruit first.

If I can get a good set by using apples, currants, citrus, lemon juice, proper boiling and a good setting test, I usually prefer that route. But I would not dismiss jam sugar completely. It is a useful tool when the recipe genuinely benefits from it.

The important thing is not to use special sugar blindly.

Understand the fruit.
Choose the sugar that suits the recipe.
Test for setting point.
Keep notes.
And learn from every batch.

That is how you become more confident with homemade preserves.

Until next time — keep crafting independence, one skill at a time.