Copycat Starbucks Sugar-Free Vanilla Syrup
Make your favourite Starbucks sugar-free drinks at home with this easy homemade sugar-free vanilla simple syrup. Perfect for iced coffees, lattes, teas, and homemade frappes – with zero sugar and loads of sweet vanilla flavour.

This Copycat Starbucks Sugar-Free Vanilla Syrup makes it easy and affordable to recreate your favourite coffee shop drinks at home. Savour that first-sip feeling anytime with this quick and easy homemade vanilla simple syrup. It’s smooth, sweet, and completely sugar-free. It works in hot or iced drinks and blends perfectly into coffee, tea, or milk.

Why you’ll love this Sugar-Free Vanilla Syrup
- 0g Sugar! Enjoy coffeehouse sweetness without spiking blood sugar or adding carbs.
- Budget-friendly. This homemade sugar-free vanilla syrup costs a fraction of store-bought syrups and you control the ingredients.
- Endlessly customizable. Use this sugar-free syrup recipe as a base and easily create all your favourite Starbucks syrup flavours at home.

Key Ingredients for Sugar-Free Vanilla Syrup
- Water: Use filtered or good-tasting tap water for the cleanest flavour.
- Sweetener: Liquid monk fruit sweetener keeps this syrup smooth, sugar-free, and keto-friendly. You could also use liquid allulose, erythritol, or stevia drops to taste. Granulated sugar substitutes can crystallize once cooled, so liquid sweeteners will work best here.
- Vanilla: For classic Starbucks-style vanilla syrup, use pure vanilla extract. Or try vanilla bean paste for an even richer flavour.
- Thickener (xanthan gum): A tiny amount thickens the syrup and gives it a smooth, syrupy texture.

Sugar-Free Syrup Variations
- Classic: Skip the vanilla for a classic, sweet simple syrup.
- Cinnamon Dolce: Add 2 cinnamon sticks while simmering for a cozy sweet cinnamon syrup.
- Peppermint: Use pure peppermint extract to create the perfect syrup for holiday lattes, mochas, and hot chocolate.
- Caramel: Combine pure vanilla and caramel extract for a caramel syrup perfect for macchiatos.
- Coffee: Swap the water for brewed coffee and keep the vanilla extract for a rich, café-style syrup that adds depth to homemade frappes and iced coffees.
How to make Sugar-Free Vanilla Syrup
Blend together all the ingredients in a pot and bring to a simmer over medium heat. Reduce the heat to medium-low and simmer for 10 minutes, until slightly thickened. Remove the pot from the heat and allow the syrup to cool for 30 minutes. Strain the syrup through a fine-mesh sieve and pour into a glass jar.

Serving + Storage Tips
With this syrup on hand, you can recreate your favourite Starbucks sugar-free drinks at home. Store it in a sealed jar or bottle in the refrigerator for up to 3 weeks. Use ½ tablespoon of syrup for every 1 cup of coffee, tea, or milk. Add more for extra sweetness, especially in iced drinks where the flavour intensity softens.
Try it in:
- Vanilla Latte: Add it to a latte made with your favourite milk or keto milk substitute.
- Iced Vanilla Coffee: Sweeten strong-brewed coffee over ice for a simple, refreshing pick-me-up.
- Vanilla Cold Foam Cold Brew: Whip a splash of syrup into heavy cream and spoon over cold brew.
- Vanilla Frappé: Blend brewed coffee, ice, a splash of cream, and syrup until frosty and smooth.
- London Fog: Stir into Earl Grey tea with a splash of cream for a warm, cozy drink.
- Vanilla Chai Latte: Sweeten chai tea for gentle vanilla warmth.
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Copycat Starbucks Sugar-Free Vanilla Syrup
Ingredients
- 1 cup water
- 1 tablespoon pure vanilla extract
- 1½ teaspoons liquid monk fruit sweetener
- ¼ teaspoon xanthan gum
Instructions
- In a small pot, blend together all the ingredients with an immersion blender (or vigorously whisk by hand).
- Bring the mixture to a simmer over medium heat. Reduce the heat to medium-low and simmer for 10 minutes, until slightly thickened.
- Remove from the heat and allow to cool for 30 minutes. Strain the syrup through a fine-mesh sieve and transfer to a glass jar.
