Retaining Custom Page Sizes in Files Converted to PDF.When you convert a file with a custom page size, Adobe Acrobat may not retain the custom page size. To ensure that a custom page size is retained, follow the steps below:
In Windows XP:
- Choose "Start" -> "Settings" -> "Printers and Faxes"
- In the Printers dialog box, select the ""Acrobat Distiller" printer.
- From the menu bar, choose "File" -> "Server Properties".
- Click "Create a New Form". In the Form Name text box, enter a name for the custom page size.
- Enter the desired values in the Width and Height text boxes.
- Click "Save Form" and then "OK"
- In the source application, choose "File" -> "Print" and select the "Acrobat Distiller".
Reference: Retaining Custom Page Sizes in Files Converted to PDF Using Create Adobe PDF Online