Warranty Card and Serial Number Slip Maker

A product sold with a warranty is usually handed over with a card. It shows what was bought, when, and when the cover ends, and it is the document a customer brings back if something goes wrong. For a small maker or a shop it can be surprisingly time-consuming to write a card for every sale, and easy to get an end date wrong. This page prepares them in bulk, with the serial number, the dates and the terms, and a barcode if you want one.

The form

Enter the seller’s name and the address, phone and email for claims. Add the product name and model, the warranty period in months, and a default purchase date. Then list the cards, one per line: the serial number, an optional customer name and an optional purchase date in the form yyyy-mm-dd. The terms are an editable box, starting with a plain default. A colour, a Code 128 barcode of the serial number and the page layout complete the setup.

The end date

For each card the page adds the months of cover to the purchase date and keeps the day of the month. A card for a purchase on 5 November 2026 with 12 months of cover shows an end date of 5 November 2027. If the target month has fewer days, the end date falls on its last day, so six months from 31 August 2026 ends on 28 February 2027. The line under the form shows the result for the default date, so you can check the convention before you print.

A worked example

Press Sample for an appliance seller. The product is a kettle, Kettle KX-2, 1.7 L, with 12 months of cover. The three cards are SN-0001 for Asha Verma and SN-0002 for Dev Malhotra, both bought on 5 November 2026, and SN-0003 for Mira Patel, bought on 6 November. Each card prints the seller, the title “WARRANTY CARD”, the product, the serial number, the customer, the purchase date, “12 months” and the end date in bold: 5 November 2027 for the first two and 6 November 2027 for the third. Each has the terms and a barcode of the serial number at the foot. The three cards share one page of four.

The terms

The default says that the warranty covers defects in materials and workmanship under normal use, that it does not cover misuse, accidents, unauthorised repair or normal wear, and that the customer should keep the card and invoice and show both when claiming. It is a plain starting text, not advice. Replace it with the terms of your own warranty, and check what consumer law in your country says you must offer or may not exclude, because some rights cannot be signed away.

The layout

On A4 the cards are 105 × 148.5 mm, four to a page in two columns and two rows with no margins; on US Letter they are 107.95 × 139.7 mm. A rounded border in your accent colour frames each card. The barcode of the serial number is optional and is drawn with Code 128. Cut the page into quarters, or leave them as cards for a booklet. Print at actual size, because scaling shifts the cards from their positions.

Edge cases

A line without a serial number is allowed, and the card then leaves out the serial number row and the barcode. A date that is not in the yyyy-mm-dd form is reported by its line number. A warranty of 1 month prints “1 month”. Up to 400 cards can be made at once. The seller details, product, terms and colour are remembered in this browser, but the serial numbers and customer names are not.

Limits

The page does not register warranties, keep a record of sales or check serial numbers. It cannot tell whether a claim falls within the terms. Local consumer law may give customers rights beyond the card, and may require particular wording, so use the page to present your terms clearly and take advice for anything beyond that.

Related tools

• Bulk Barcode Sheet Generator prints serial-number labels for the products themselves.
• Invoice Generator produces the purchase invoice that goes with the card.
• Product SKU Generator creates codes for a range of products.
• Receipt Generator records the payment the warranty relates to.