sugar free ketchup in bowl with spoon

Homemade Sugar-Free Ketchup Recipe

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This homemade sugar-free ketchup recipe is sure to please. Whether you have gone “sugar-free” to lose weight, control your blood sugar, or to eat healthier in general, you will love this recipe! It contains only fresh tomatoes, apple cider vinegar, and spices. You can optionally add fresh onions too, even though this recipe uses onion powder.

fresh tomatoes in strainer

When made with fresh tomatoes straight from the garden, this recipe is better tasting than the commercial varieties available, and you will be feeding yourself and your family real ingredients: no sugar or high fructose corn syrup. You can add a bit of non-sugar sweetener if you wish, but I have found that using various tomato types straight from the garden is plenty sweet without added sweetener.

ketchup ingredients

So How Do You Make Sugar-Free Ketchup From Scratch?

Start by harvesting fresh tomatoes. They should be ripe or nearly ripe with solid red flesh and no soft or bad spots. Wash and set aside for now. This is not a quick recipe, but it is easy and so worth the effort.

Decide if you want to freeze or can your ketchup. Wash and organize your equipment for whichever method you plan on using. I have both frozen and canned this recipe in 4 – 8 ounce jars. After opening, it will keep for about 10 – 14 days in the refrigerator. Plan the size of your containers based on how quickly you expect to finish off a container.

Many recipes you will find will start with tomato paste, or if they use fresh tomatoes, they will blanch the tomatoes to remove the peels. I don’t do either.

raw tomatoes ready to cook

After washing, remove the stems. Cut the tomatoes in quarters. Remove most of the seeds and liquid from inside the tomatoes. If there are a few seeds left behind, don’t worry about it. You will blend the ketchup after cooking, and this will take care of any strays.

Cooking Your Sugar-Free Ketchup Recipe

Put the tomatoes in a large soups kettle or stockpot. Mix in all of the other ingredients.

Place on the stove over medium to medium/high heat. Heat until it just starts to bubble. Lower heat to maintain a simmer. Continue cooking at a simmer, frequently stirring, until the mixture has cooked down and is the thickness of commercial ketchup. Your ketchup will thicken a bit as it cools.

tomatoes cooking in stockpot

Finishing and Storing Your Homemade Ketchup

After the mixture is at the consistency you desire, use an immersion blender to break down the peels and any stray seeds that remained.

If you are planning on water bath canning your Sugar-Free Tomato Ketchup, it is a good practice to check the acidity level of the tomatoes. This is done simply by using PH strips dipped in the final mixture.

PH test strip with chart

Follow recommendations for acceptable PH level for water bath canning method.

fresh tomatoes with canned tomatoes

Transfer your sugar-free ketchup into either freezer containers. If you prefer, your ketchup can be canned by the water bath method, following instructions for tomato sauce. And of course, keep any leftovers out to use fresh!


pin for sugar free ketchup
ketchup in bowl with spoon

Sugar-Free Ketchup Recipe

Low-Carb and Keto Friendly Sugar-Free Ketchup Recipe from Fresh Tomatoes
Print Pin Rate
Course: Condiment
Cuisine: American
Keyword: ketchup, KETO friendly, Low Carb, sugar-free
Prep Time: 15 minutes
Cook Time: 1 hour
Servings: 64
Calories: 10kcal


  • large stockpot
  • immersion blender
  • canning or freezing containers


  • 6 pounds fresh tomatoes
  • 1 cup apple cider vinegar
  • 1 teaspoon Worcestershire sauce
  • 2 tablespoons garlic powder
  • 2 tablespoons onion powder
  • 2 teaspoons mustard powder
  • 1 teaspoon salt
  • ½ teaspoon black pepper


  • Wash tomatoes.
  • Cut tomatoes in quarters, removing cores, stems, seeds and liquid.
  • Place all ingredients in a large stockpot or soup kettle.
  • Heat pot over medium to medium/high heat until mixture begins to bubble.
  • Reduce heat and simmer until the mixture reaches the thickness of ketchup.
  • Remove from heat.
  • Blend the ketchup with an immersion blender.
  • Prepare for storage, either canned or frozen.
  • If canning, use the water bath method and follow instructions for canning tomato sauce.


This recipe makes approximately (8) 8-ounce containers. A single serving is calculated at 2 tablespoons. Nutritional information is an estimation only as the volume will vary with each batch and cook. 


Nutrition Facts
Sugar-Free Ketchup Recipe
Amount Per Serving (2 tablespoon)
Calories 10 Calories from Fat 9
% Daily Value*
Fat 1g2%
Saturated Fat 1g6%
Sodium 40mg2%
Potassium 109mg3%
Carbohydrates 2g1%
Fiber 1g4%
Sugar 1g1%
Protein 1g2%
Vitamin A 354IU7%
Vitamin C 6mg7%
Calcium 6mg1%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.

Nutrition label is calculated by automated third-party services. The nutritional information provided here is an estimate only, for informational purposes only, and can vary depending on the specific ingredients, preparation and accuracy of the third-party system used for calculations. It is always best practice to confirm the nutritional calculations, especially if nutritional information is critical to your diet plan.

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