I have got some excel sheet and want to fill fields automaticly with data. I would like to be able to somehow tag the boxes where information can be entered. So I can then use some api (itext,pdfbox?) to fill these field without having to measure the pdf with a ruler and then paint into the right spaces. And it should be changable in the future.
What are the best apis and tool to use?
Which format should I use, xls, pdf, pdf with fdf or something better?
Project can invest 0 euros into buying tools.
For modifying/creating: