Can You Sign a PDF That Was Already Digitally Signed?
Question details
The user wants to know if it is possible to add an additional signature to a PDF document that already contains a digital signature from another party.
- Product
- Device & OS
- not provided
- Scenario
- Attempting to sign a PDF document that has already been digitally signed by someone else.
- Observed behavior
- The document is often locked for further editing, preventing the addition of a new signature unless a specific workflow field was pre-assigned.
Check if the PDF was sent to you via an active e-signature workflow with a field specifically assigned to you, or if it was attached to an email as a finalized, locked document.
Sign the Pre-assigned Signature Field
If the document is part of an active signing workflow, you can add your signature to the designated field without invalidating previous signatures.
When a document creator sets up a multi-party signature workflow, they assign specific signature blocks to each recipient. As long as you are signing your designated field, the document will accept your signature.
Open the email invitation or the secure document link provided by the sender.
Scroll through the document to find the specific signature field assigned to you, which is usually highlighted or marked with a 'Sign Here' tag.
Click the field, apply your digital or electronic signature, and submit the completed document.
Request a New Signature Workflow from the Sender
If the document is finalized and locked, you cannot add a new signature directly. You must ask the sender to initiate a new process.
Use WPS Office to Create and Manage Multi-Signature PDFs
WPS Office provides a comprehensive PDF toolset that allows you to easily add multiple signature fields, manage document permissions, and sign PDFs securely without hassle.
- 1. Open your PDF: Launch WPS Office and open the PDF document you need to prepare for signing.
- 2. Use Fill & Sign: Navigate to the 'PDF' tab and select 'Fill & Sign' to add signature fields or apply your own signature.
- 3. Save and Share: Save the document and share it with all required signers to complete the workflow.
Frequently Asked Questions
Why does a PDF lock after it is digitally signed?
Digital signatures use cryptography to seal the document. Locking prevents unauthorized alterations that would invalidate the original signature's authenticity and legal standing.
Can I print a digitally signed PDF, sign it physically, and scan it?
Yes, if the document permissions allow printing, you can print it, sign it by hand, and scan it back. However, doing this breaks the digital cryptographic chain of the original signature, turning it into a standard image.
How can I tell if a PDF is locked for signing?
Open the PDF in your reader (like WPS Office). If the signature tools are grayed out or a security padlock icon appears in the document properties indicating 'No Changes Allowed', the document is locked.
