Complete Guide About How to Add a CAC Signature to PDF

July 31, 2023 19.3K views

Are you looking for an easy and efficient way “how to add a CAC signature to PDF files?” Look no further! With the right tools and knowledge, you can add a CAC (Common Access Card) signature to your PDF documents in just a few simple steps. CAC is a smart card used by the United States Department of Defense to ensure secure access to their systems and networks. This process is crucial for those working with sensitive information in a government or military setting, as it verifies the authenticity and integrity of the file. In this article, we will explore some of the most user-friendly and straightforward methods for adding CAC signatures to PDFs. So, let’s dive in and discover “how to add CAC signature to PDF” files with ease.

How to Add a CAC Signature to PDF With WPS Office

WPS Office is an all-in-one, multi-platform supported, popular office suite that allows users to create and edit docs, sheets, PPT and PDF files conveniently. In addition to its many features, it also includes a built-in tool for adding CAC signatures to your PDF documents. Here’s how to add a CAC signature to a PDF using WPS Office:

  1. Open WPS Writer and create a new document or open an existing PDF file that you want to sign.

  2. Click on the “Fill & Sign” tool from the side toolbar, and then sign > create a signature.

1. In the “PDF Signature” dialog box, select the signature, either image, text, or any other input, and hit “ok.”

2. Now drag the newly created signature to any position on the page and Click “Ctrl+S” to save the changes.

How to Add a CAC Signature to PDF Using Adobe Acrobat DC

Adobe Acrobat DC is a software application developed by Adobe Inc. It is a family of software products used to view, create, edit, and manage PDF (Portable Document Format) documents. Adobe Acrobat DC is available as a subscription-based service and as a standalone desktop application. It includes a range of features, including the ability to edit text and images in PDFs, convert PDFs to other formats, create forms and surveys, and add multimedia elements such as audio and video. One of its amazing features is its ability to add CAC signatures to PDFs. Just follow the below procedure to achieve this:

  1. Open the PDF document in Adobe Acrobat and head to its “‘Tools” section.

  2. Select “Certificates” from the “Certificates and Signatures” section.

  1. Click on “Digitally Sign” in the toolbar.

  2. Click on “Add ID” to set up your CAC signature.

  3. Browse your CAC certificate file, and enter your CAC PIN to access your certificate.

  4. Choose your signature appearance options and click “Sign.”

  1. Drag and drop the signature field to the appropriate location in the document and then save all the changes.

How to Add CAC Signature to PDF Using PDFfiller Online

PDFfiller is an online platform that allows users to edit, sign, and share PDF documents easily. It offers a variety of tools to help users manage their PDF files, including the ability to add digital signatures. Follow the below step-by-step guide to add a normal e-signature or CAC signature to any document.

  1. Open your favorite web browser and then head to PDFfiller online utility.

  2. Now click the “Browse for a document on your computer” to upload your desired file to the program’s interface.

  1. The file will undergo the uploading process; once completed, Click on the “Sign” Option and then select any type of signature or draw your own and hit “Save & Sign” and then “Done” to preserve all changes. That is all!

Using Tips

✅Ensure that you’ve a valid CAC card and PIN before attempting to add a CAC signature to a PDF document.

✅Always Keep a backup copy of the original document before adding the CAC signature to help assist in comparing the original and signed document.

✅However, adding a normal signature to PDF is a free feature in the WPS office, but you’re advised to buy a premium subscription or sign up for a 7-day free trial for more advanced signature options.


1 - Is it safe to add a signature to a PDF document using WPS Office?

Yes, it’s safe to add a signature to a PDF document using WPS Office. The software uses encryption to protect the signature and ensure the document remains secure. You can easily learn how to sign a pdf with WPS PDF.

2- Is it necessary to have a card reader to add a CAC signature in any editor?

Yes, a card reader is necessary to add a CAC signature. The card reader is used to access the CAC certificate on the card and verify the user’s identity.

Download WPS Office Free Trial to Add Signature to PDF

We’ve left no stone unturned to provide you with the best methods about “how to add CAC signature to PDF.” Adobe is the most convenient for this purpose, with a dedicated feature to add certificate signatures, but when we look at versatility, then WPS Office is the best of all available options to sign pdfs with text or logo image. This software is available for MAC, Windows, and Linux operating systems with a 7-day free trial. Using WPS office, you can not only deal with PDF files but 47 other formats with ease. So what’re you waiting for? Download WPS Office to make your document dealing a breeze!

7-day Free Trial with WPS Office Full Features

15 years of office industry experience, tech lover and copywriter. Follow me for product reviews, comparisons, and recommendations for new apps and software.