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Steps

Start

PDF upload form, action=load.php.

Load

When "Load" is clicked, the document is posted to load.php, which converts all pages to JPEG and then redirects to edit.php.

Edit

The user scrolls through the document (JPEG pages) and can click at arbitrary positions to create edit fields, to which text can be entered. Text is stored in a [JSON](JSON format). Export button ...

Export

The JSON is posted to export.php, which creates an overlay PDF, invokes pdftk and returns the result.

Links

• PHP PDF library: http://www.tcpdf.org/
• http://www.tcpdf.org/doc/code/classTCPDF.html#a6669ae88090963e9487d0388c7577dc9
• overlay using pdftk: http://stackoverflow.com/questions/7746687/pdf-insert-a-line-of-text-into-an-existing-pdf-file