If you’re looking to do a mail merge on top of a PDF, you’ve got a few routes to explore.

One option is to use some of the popular PDF libraries available in languages like Python. The idea is to either overlay your data onto an existing PDF or fill in designated form fields if your PDF is set up that way. Essentially, you’d have your PDF template and then use a tool to “stamp” or insert your personalized content wherever you need it.

If you’re not up for writing a bunch of code or just need something quick, there are online tools that can handle this for you. For example, there are a few no-code solutions that let you upload your PDF and a spreadsheet, then automatically merge the data. One such tool is Row2PDF (Disclaimer: I'm the author of this software), which makes the whole process pretty straightforward.