Question

Actually i’m looking for a simple online WYSIWYG PDF editor where i can build simple formular (image,text,inputs) with drag&drop, but i could’nt find any.

Alternatively i would also accept a HTML WYSIWYG editor like ckeditor, but with an Grid option for placing absolute elements. With only absolute elements it should’nt be hard to write a PDF output out of the HTML source.
I know the html2pdf stuff but last time i used it (about 1 year), those scripts where horrible slow and not quite exactly.

Answer 1

Google Docs can export as PDF.

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UPDATE

As your comment clarifies you would like to implement your own editor I would suggest you use FPDF which allows you to create PDFs in pure PHP without using PDFlib.

Edit: Use your favorite HTML WYSIWYG along with dompdf. Similar to the idea you yourself suggested.