Edit PDF Texts
Edit PDF Images
Edit Links in PDF
PDF Watermark
PDF Background
Header & Footer
Bates Numbering
Marking up Text
Drawing Markup
Add Comments
Fill in PDF Forms
Create PDF Forms
Manage PDF Forms
Password & Permission
Add Signature to PDF
Redact PDF

Add Signature to PDF

1What is Digital ID

Digital ID (Digital Identiry) of a person/organization contains your name, email address, a serial number, an expiration date, and the name of the company. It is a public key certificate, also known as a Digital Certificate or a Digital identity certificate that you can use to verify your identity or encrypt in an electronic document.
You can create a self-signed digital ID with iSkysoft PDF Editor, or obtain a digital ID from a trusted third-party provider. Your ID is protected by password sthored on a computer in PKCS#12 file format, or in the Windows Certificate Store.

2 How to Create A Signature

If you don't have a digital ID, you'll need to create it first.
Step 1. Click on "Protect">"Sign Document", the pop up window reminds you to select a place you want to add your signature at, click "OK" to proceed to select the place.
Step 2. Next you'll need to "Add Digital ID", check "I want to create a new digital ID now".
add digital id in pdf
Step 3. Select the place where you want to store your self-signed digital ID and click "Next".
Below are two places to store your digital id:
New PKCS#12 digital ID file—Stores the digital ID information to a file with the extension .pfx on Windows and .p12 on Mac OS. You can use the files interchangeably across different operating systems.
Windows Certificate Store—Stores the digital ID to a common location. Other windows applications can also retrieve it.
store digital id
Step 4. Enter your identity information to be used when generating the self-signed certificate.
digital id information
Step 5. Finally you'll get a digital ID you can sign as. Enter the password you set before and click "Sign" if you want to sign.
sign in with digital id
After you set your digital ID, you can directly go to "Protect">"Sign Document" and enter your password to sign any files you want.
set digital id

3 How to Add Signature Field

You can add signature field to your PDF file by using the "Place Signature" button.
sign in with digital id
If you want to customize the appearance of your signature, click "Appearance" in the drop down list to choose "Create New Style", you can check the specific options for a signature.
set signature appearance
set signature appearance

4 How to Validate and Clear Signature

To validate the signatures, you can click the "Protect">"Validate All Signatures".
To remove the signatures, you can click the "Protect" > "Clear All Signatures", you can remove all digital signatures in your PDF.
clear signature in pdf
Back to top