PDF Editing Issues

How to Change or Add a Signature While Commenting on a PDF

Huma Ashraf Ch Oct 23, 2026 868 views

Question details

The user wants to know how to add a new signature or change an existing one while making comments on a PDF file.

Product: PDF Editors
Device & OS: not provided
Scenario: Reviewing a PDF document and needing to either sign the document alongside comments or modify an already applied signature.
Observed behavior: Users experience confusion because commenting and signing are separate tools in most PDF software, and applied signatures often become locked after the document is saved.

Before you start

Verify if the PDF has already been certified or saved after signing. In most professional PDF editors, an electronically signed document is locked to protect its authenticity, meaning you cannot change an existing signature once the file is finalized.

Solution 1Recommended

Use Separate Tools to Add Comments and Apply a New Signature

Commenting and signing are distinct functions. You must use the dedicated signature tool to apply a signature independently from your review text.

In most PDF editing applications, adding a signature is treated as a secure action, whereas commenting is a review action. You cannot embed a functional signature directly inside a comment box.

Add your comments

Open the PDF in your editor and navigate to the 'Comment' or 'Review' tab to add your text annotations, highlights, or sticky notes.

Select the signature tool

Switch to the 'Sign' or 'Fill & Sign' tool located on the main toolbar or tools menu.

Create or select a signature

Create a new signature by drawing with your mouse, typing your name, or uploading an image of your physical signature.

Place the signature

Click on the specific area of the document where you want the signature to appear, then resize it as needed before saving.

Use Separate Tools to Add Comments and Apply a New Signature

Order of Operations: It is a best practice to add all your comments and review notes first, and apply the final electronic signature as the very last step before saving.

Solution 2

Remove and Replace an Unsaved Signature

If you have placed a signature but have not yet saved or certified the document, you can delete it and add a new one.

Easy PDF Signing and Commenting

Manage PDF Comments and Signatures Easily with WPS Office

WPS Office provides an intuitive and powerful PDF editor that allows you to seamlessly switch between adding annotations, reviewing comments, and applying secure electronic signatures within a single, unified interface.

1. Open your PDF: Launch WPS Office and open the PDF document you want to review and sign.
2. Add Comments: Navigate to the 'Comment' tab to highlight text, add sticky notes, or insert text boxes for your review.
3. Apply a Signature: Switch to the 'Fill & Sign' tool, create your customized signature, and place it exactly where needed on the page.
4. Save the Document: Review your annotations and signature placement, then click 'Save' to finalize your signed PDF.

Easily add, manage, and edit electronic signatures on any document.Comprehensive commenting and annotation tools for efficient document review.Fully compatible with standard Adobe Acrobat PDF formats.Lightweight application that handles large PDFs smoothly and quickly.

microsoft office alternative - wps office

Frequently Asked Questions

Why can't I edit a signature I just added to my PDF?

Once a PDF is saved, closed, or certified with a digital signature, the document is typically locked to protect its integrity and prevent unauthorized modifications. You can only edit or delete a signature before you save the file.

Can I use the comment drawing tool to add a signature?

While you can technically use a drawing or stamp tool within the comment section to mimic a signature, it is highly recommended to use the dedicated 'Sign' tool. Dedicated signature tools ensure proper formatting, tracking, and document validity.

How do I remove someone else's signature from a PDF to add my own?

For security reasons, you generally cannot remove another person's digital signature from a certified PDF. If changes are required, you must request the original, unsigned version of the document from the sender so you can add your comments and signature.

PDF Troubleshooting