PDF Security & Access Issues

How to Send a PDF to Multiple Signers Sequentially

Phi Hung VoPhi Hung Vo Nov 3, 2026 869 views

Question details

The user needs to collect signatures from multiple people on a single PDF document at different times but encounters issues because previously signed files are no longer accepted for new requests.

How to Send a PDF to Multiple Signers at Different Times
Product
PDF
Device & OS
not provided
Scenario
Setting up a sequential signature workflow to route one agreement to multiple recipients in a specific order.
Observed behavior
When attempting to send a PDF that was already signed and flattened via basic Fill & Sign tools, the system rejects it as an unsupported or locked file for subsequent automated signature requests.
Before you start

Ensure you have the original, unsigned version of your PDF document ready, as previously signed or flattened files may be locked for security and cannot be used to initiate a new sequential signature request.

Solution 1Recommended

Set Up a Sequential Signing Workflow in Adobe Acrobat Sign

Create a single agreement with all recipients included from the start and establish a strict signing order to automate the routing process.

Instead of manually sending a document back and forth, professional e-signature platforms allow you to automate the routing. By setting a signing order, the document is only forwarded to the second person after the first person has completed their required fields.

1
Start a new signature request

Log into Adobe Acrobat Sign, navigate to the Home tab, and click on 'Request e-signatures' to initiate a new agreement.

2
Add recipients in order

In the Recipients section, enter the email addresses of all required signers. Ensure the toggle for 'Complete in Order' is turned on so the system assigns a sequential number (1, 2, 3) to each email address.

3
Upload the unsigned document

Click 'Add Files' to upload the original, unsigned PDF document that requires signatures. Do not use a copy that has already been flattened.

4
Assign signature fields

Click 'Next' to open the authoring environment. Drag and drop signature fields for each participant, making sure to assign the correct fields to the corresponding recipient in the drop-down menu.

5
Send the agreement

Review your document setup and click 'Send'. The system will automatically route the PDF to the first signer, and then sequentially to the others once the preceding signatures are completed.

Set Up a Sequential Signing Workflow in Adobe Acrobat Sign
Avoid Flattened Copies: Do not use a PDF that has already been signed through basic Fill & Sign tools as the source file. Once flattened, the file is secured to prevent tampering and cannot be processed for a new automated signature request.
Efficient PDF Editing and Signing

Sign and Manage PDFs Seamlessly with WPS Office

WPS Office provides powerful and user-friendly PDF tools, allowing you to easily insert multiple signatures, protect documents, and collaborate securely without relying on expensive, overly complex software.

  1. 1. Open your document: Launch WPS Office and open the unsigned PDF document you need to prepare.
  2. 2. Access signature tools: Navigate to the 'Fill & Sign' or 'Protect' tab located on the top menu ribbon.
  3. 3. Create and insert signatures: Click 'Sign' to draw, type, or upload an image of your signature, and place it exactly where needed on the document.
  4. 4. Save and route: Save the signed document securely. You can then share the file via email or WPS Cloud for the next person to review and add their signature.
Easily create, insert, and manage multiple digital signaturesFully compatible with standard Microsoft Office and Adobe PDF formatsLightweight, fast, and completely free to downloadEdit PDF text, images, and form fields seamlessly
microsoft office alternative - wps office

Frequently Asked Questions

Why can't I request a signature on a PDF that's already signed?

Once a PDF is signed using most digital signature tools, it is 'flattened' and secured with encryption to prevent tampering. This security measure locks the document, making it uneditable and incompatible with automated routing for new signature requests.

How does sequential signing actually work?

Sequential signing is an automated workflow where a single document is routed to multiple recipients in a specific order. The second person is only notified to view and sign the document after the first person has successfully completed their assigned fields.

Can I change the signing order after I send the agreement?

In most e-signature platforms, the routing order is locked once the agreement is sent out and the signing process has begun. To change the order, you typically need to cancel the current transaction and send a new request.

Is it possible to have both sequential and parallel signing in one document?

Yes, many advanced e-signature platforms allow hybrid workflows. For example, you can set the document so that two people can sign at the same time (parallel) and, once both are done, route it to a final approver (sequential).