When sending a document for signature via Addo Sign, it must be in PDF format. We support documents in PDF/A-3 format or later. Older formats such as PDF/A-1 and PDF/A-2 are not supported, as these do not allow the necessary digital signature elements to be embedded.

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:

You can check the PDF-version of your document, by following the steps below:

1. Open the PDF document in Adobe Acrobat Reader

2. Click File

3. Then click Properties

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

Is it possible to send documents other than a PDF for signature? No, but you can send documents for signature directly from Word with Addo Print.

If you receive an error message stating that your PDF document cannot be distributed or uploaded for signing, it may be due to a general issue with PDF/A compliance.

This means the document does not meet the technical standards required for secure digital signing in Addo Sign.
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If you're using Adobe Acrobat, follow these steps to prepare a compatible document:

1. Save as PDF/A

2. Verify PDF/A Compliance

By following these steps, you can ensure your document meets the required standards and can be signed and distributed without errors.