Certify a PDF (Pro Only)

Only the author can certify his/her own PDF documents. The author can specify what changes can be made to the file after certifying. Whenever approved changes are made, the certificate remains valid. If a reader tries to make changes you haven't allowed, the certificate is invalidated and any subsequent users will be notified that the document was tampered with.

To certify your PDF, please do the following:

1. Open your PDF document you want to certify. 
2. Select Protect > Sign & Certify > Certify with visible signature/Certify without visible signature.
3. Press and hold mouse button down, drag to select an area on the document where you want the signature to appear.
4. In the pop-up Certify Document dialog box, choose a digital ID. If you don’t find the specified digital ID, you need to get a digital ID from a third-party provider or create a self-signed digital ID.
5. Set authorized actions for your document from the drop-down menu in Permitted Actions After Certifying item. 
6. Set the signing reason and choose an appearance type from the menu. 
7. Click Sign.
8. To set the properties of the signature, please refer to Signature Field Properties. 
9. To sign the document, please see Sign a PDF. 
10. To validate the signature, please refer to Validate Signatures.