How to Countersign a PDF After Someone Else Signs It
Question details
The user needs to add a second signature to a PDF document after another party has already signed it, but the file becomes locked.
- Product
- Device & OS
- not provided
- Scenario
- Attempting to countersign a PDF file that was sent to and signed by another individual.
- Observed behavior
- The PDF file is automatically locked after the first signature is applied, preventing any subsequent signatures or modifications by the document author.
Before routing your document, confirm exactly how many parties need to sign it so you can prepare the correct number of signature fields in advance.
Pre-configure Multiple Signature Fields
The correct method to allow countersigning is to set up sequential signature fields in advance and configure only the final field to lock the document.
When a standard digital signature is applied to a PDF, the document is often automatically locked to ensure integrity and prevent tampering. This security mechanism is exactly why you cannot simply add another signature to a previously signed and locked file.
To bypass this limitation without breaking security protocols, you must prepare the document by adding all necessary signature fields before anyone signs.
Open your unsigned PDF document in your PDF editor and navigate to the 'Form' or 'Protect' tab to access the signature field tools.
Click the 'Digital Signature' tool and drag to draw the first signature box where you want the other party to sign.
Draw a second 'Digital Signature' box in the area where you intend to place your countersignature.
Right-click the second signature field, select 'Properties', go to the 'Signed' tab, and check the option to 'Lock document after signing'. Leave this unchecked for the first field.
Save the file and send it to the first signer. Once they sign their designated field and return the file, click your second field to apply your countersignature.
Recreate the Document if Already Locked
If you have already received a locked document from the first signer, you cannot unlock it without invalidating their signature. You must start over with a fresh document.
Manage Multiple Signatures Effortlessly with WPS Office
WPS Office offers comprehensive PDF editing and form creation tools, empowering you to insert sequential digital signature fields easily. Ensure document security without locking out necessary signers.
- 1. Open PDF in WPS Office: Launch WPS Office and open your unsigned PDF document.
- 2. Access Form Tools: Navigate to the 'Form' tab on the top ribbon to reveal the interactive field tools.
- 3. Place Signature Fields: Select the 'Sign' or 'Digital Signature' icon and draw the necessary fields for all signers.
- 4. Countersign Safely: After receiving the signed document back, simply click your designated field to add your secure countersignature.
Frequently Asked Questions
Why does a PDF lock automatically after the first signature?
Digital signatures are designed to ensure document integrity. When a document is signed, the PDF software often locks it automatically to guarantee that no content has been altered since that specific signature was applied.
Can I unlock a signed PDF to add my countersignature?
No. If the document was locked by a digital signature, it cannot be unlocked without invalidating the original signature. The document must be prepared in advance with sequential signature fields to allow multiple signers.
What happens if the first signer checks the 'Lock Document' box?
If the first signer manually checks a 'Lock Document After Signing' prompt in their PDF viewer, it overrides your field settings and locks the file. It is best practice to instruct the first signer not to check any locking boxes when they apply their signature.
Does this locking issue happen with regular electronic signatures?
Typically, no. A basic electronic signature (like an image of your signature stamped on the page) rarely locks the file. This locking behavior is specific to cryptographic Digital Signatures, which use certificates to verify identity and strictly secure the document.
