Your list and your letter stay in this browser. Nothing is uploaded.
How mail merge works
Each row of your spreadsheet becomes one letter. Wherever the letter has a field in curly brackets, such as {{First name}}, the value from that column is put in. Field names ignore capitals and spaces, so {{first name}}, {{First Name}} and {{first_name}} all match a First name column. A field shows in red when there is no column with that name.
One PDF or many
One PDF puts every letter on its own page, ready to print in one go. A zip with a PDF per row is better for sending each person their own file. Name the files with fields too, such as Letter - {{First name}} {{Last name}}, and duplicate names get a number added.
Letters, certificates, labels and more
Use it for payment reminders, offer letters, parent letters, event invitations or thank-you notes. For award certificates with a decorative border, use the certificate maker, which takes names from a spreadsheet in the same way. If you have saved your name and address in Your kittybin, they can head every letter.