Thank you so much for your help and suggestions.
What I am looking for is NOT something that will be on my site, but it’s like a file/document that I send to people.
I don’t actually need the form to be online. It should a offline file that contain a questionnaire: at the moment I have it in PDF and Word doc.
I am not keen in using the Word document because people can modify stuff and it can be a bit messy; the pdf is cool, but people cannot write on it. And so they need to print the file, fill it up, scan it and send it back to me.
I was wondering it you know of any way I can do this: where I can send a file as a document, but people can fill the document with informations, without touching my writing.
It would awesome if you have something in mind where I can also apply some design to it, such as my colour branding, logo etc. like in the footer, or at the top for example.