When sending a document for signature via Addo Sign, it must be in PDF format. We support transactions in PDF version 1.7 and newer, corresponding to PDF/A-3 or later.

You cannot send documents in PDF/A-1 or PDF/A-2 formats (equivalent to PDF versions 1.0–1.6), as these do not support the changes needed to apply digital signature stamps.

If your document meets the correct PDF/A format (a legal requirement in several Nordic countries), it will be returned to you in signed form, in the same PDF/A version as originally uploaded.

There are multiple formats of PDF/A. Here, we will provide an overview of how to determine which versions fall under the different PDF/A formats:

• PDF/A-1 = PDF version 1.0 - 1.4

• PDF/A-2 = PDF version 1.5 - 1.6

• PDF/A-3 = PDF version 1.7 - 1.9

• PDF/A-4 = PDF version 2.0 -

To check the PDF version of your document:

1. Open the PDF document in Adobe Acrobat Reader

2. Press File

3. Then click Properties

4. The PDF Version field will show which version it is

To convert your document to a newer version, follow these steps:

1. Press File

2. Press Print

3. Press and select "printer"

4. Select Microsoft print to PDF

5. Press Print

6. Then, choose a name and location for the PDF document that you have just converted to a newer PDF version.

It is not possible to send documents other than a PDF for signature? No, but you can send documents for signature directly from Word with Addo Print.