PDF Editing Issues

How to Add a Signature to a Fillable PDF Signed with DocuSign

Adam Davis Nov 3, 2026 869 views

Question details

The user is unable to use the drag-and-drop signature feature on a PDF because it already contains DocuSign form fields.

How to Add a Signature to a Fillable PDF Form Already Signed with DocuSign

Product: Adobe Acrobat
Device & OS: not provided
Scenario: Attempting to add a saved personal signature to a document that has been set up with fillable fields or previously signed via DocuSign.
Observed behavior: The standard Fill & Sign drag-and-drop functionality is disabled or unavailable because the PDF is recognized as a structured fillable form.

Before you start

Check the document properties to ensure the PDF is not completely locked or finalized by the previous signer, which would legally and technically prevent any further modifications.

Solution 1Recommended

Use Existing Form Fields to Apply Your Signature

Bypass the standard Fill & Sign drag-and-drop tool by interacting directly with the designated signature fields embedded in the document.

When a document is formatted as a fillable form, PDF readers disable standard free-form tools to protect the integrity of the document's structure. You must use the interactive fields provided by the sender.

Open the PDF document

Launch your PDF reader and open the file containing the fillable fields and existing DocuSign formatting.

Locate the signature field

Scroll through the document to find the designated, highlighted box where your signature is requested. Do not open the 'Fill & Sign' toolbar.

Click to sign

Click directly inside the existing signature field. A dialog box will appear prompting you to either type, draw, or insert a saved digital signature.

Apply and save

Follow the on-screen prompts to apply your signature, then save the completed document to your local drive.

Use Existing Form Fields to Apply Your Signature

Document Lock Status: If clicking the field does nothing, the document may have been finalized and locked by the original author. In this case, you must request a new signing workflow from the sender.

Easily Sign PDFs

Sign Fillable PDFs Easily with WPS Office

If you are struggling with restricted signing tools in other software, WPS Office provides a streamlined PDF editor that makes it easy to add electronic signatures, fill out forms, and manage PDF documents without hassle.

1. Open the PDF: Launch WPS Office and open your fillable PDF document.
2. Access signature tools: Navigate to the 'Fill & Sign' or 'Protect' tab located on the top ribbon.
3. Create or select signature: Click on 'PDF Signature' to create a new signature or select an existing saved signature.
4. Place the signature: Hover over the designated field or any blank space on the document and click to place your signature securely.

Seamlessly sign and fill out interactive PDF formsFully compatible with standard Adobe PDF formatsLightweight application with an intuitive, user-friendly interfaceOffers reliable electronic and digital signature capabilities for free

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Frequently Asked Questions

Why is the Fill & Sign feature grayed out or unavailable in my PDF?

This typically happens when the PDF is formatted as a fillable form, contains interactive fields, or has been certified and locked by a previous signer. You must use the embedded form fields to sign or request an unlocked copy.

Can I edit a PDF after it has been signed through DocuSign?

Once a document is completed and finalized in DocuSign, it is encrypted and locked to prevent tampering. You can only add signatures to designated interactive fields if the specific workflow still allows it.

How do I remove a locked signature from a PDF?

If the document was digitally locked by the sender to protect its integrity, you cannot remove the signature or freely edit the file. You must contact the original sender to issue a new, unlocked document.

PDF Troubleshooting