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With the free download of Clicksign you can sign electronic invoices in PDF but you have to consider the following limitations:

• The following image will be pasted on the PDF document when signing:

• You can sign PDFs only

• You have to sign one per one the issued invoices without automatitzation posibility.

By purchasing Clicksign Pro:

• You just have to worry about of placing the PDF invoices on a defined directory and the signature will be transparent for the user and automatic
• You can sign XML to issue invoices with the Facturae standard