To indicate free shipping using schema markup, you need to implement structured data on your website that communicates this offer to search engines and can potentially enhance your product listings in search results. Here are the steps to implement this:
Understand Schema Markup: Schema.org is a collaborative effort of major search engines, providing a universal vocabulary for structured data. It helps search engines understand the content on your site.
Select Appropriate Types: To denote free shipping, you’ll primarily work with schema types related to e-commerce. Specifically, look at types like Product, Offer, and AggregateOffer. The Offer type includes attributes like price, priceCurrency, and eligibleRegion, which can help specify shipping conditions.
Employ shippingDetails: The OfferShippingDetails type can be used to specify shipping methods and costs. Use shippingDetails.jsonld within your Offer or Product schema to lay out the conditions for free shipping.
Schema Structure for Free Shipping:
Use OfferShippingDetails and provide details using properties such as shippingRate, shippingDestination, and deliveryTime.
A critical piece to specify free shipping is to set shippingRate to zero.
JSON-LD Implementation Example:

json
{
“@context”: “https://schema.org/”,
“@type”: “Product”,
“name”: “Sample Product”,
“offers”: {
“@type”: “Offer”,
“price”: “29.99”,
“priceCurrency”: “USD”,
“eligibleRegion”: {
“@type”: “Place”,
“name”: “US”
},
“shippingDetails”: {
“@type”: “OfferShippingDetails”,
“shippingRate”: {
“@type”: “MonetaryAmount”,
“value”: “0.00”,
“currency”: “USD”
},
“shippingDestination”: {
“@type”: “DefinedRegion”,
“name”: “Free Shipping”
},
“deliveryTime”: {
“@type”: “ShippingDeliveryTime”,
“transitTime”: {
“@type”: “QuantitativeValue”,
“minValue”: 1,
“maxValue”: 5,
“unitCode”: “d”
}
}
}
}
}
Testing and Validation: After adding the markup, use Google’s Rich Results Test or the Schema Markup Validator to ensure there are no errors and the data is correctly implemented.
Monitor and Adjust: Once implemented, keep an eye on search performance and ensure that your offers, including free shipping, are correctly displayed in search results.

By accurately implementing this structured data, you’re able to communicate the offer of free shipping directly to search engines, potentially improving your e-commerce site’s visibility and appeal in search results.